EP2811041B1 - Alliage d'aluminium présentant une résistance à l'usure, une aptitude à l'extrusion et une aptitude au façonnage par forgeage d'excellente qualité - Google Patents

Alliage d'aluminium présentant une résistance à l'usure, une aptitude à l'extrusion et une aptitude au façonnage par forgeage d'excellente qualité Download PDF

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Publication number
EP2811041B1
EP2811041B1 EP12867174.0A EP12867174A EP2811041B1 EP 2811041 B1 EP2811041 B1 EP 2811041B1 EP 12867174 A EP12867174 A EP 12867174A EP 2811041 B1 EP2811041 B1 EP 2811041B1
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Prior art keywords
extrusion
aluminum alloy
eutectic
size
abrasion resistance
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German (de)
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EP2811041A4 (fr
EP2811041A1 (fr
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Kensuke Mori
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UACJ Corp
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UACJ Corp
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/003—Selecting material
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04—Modified aluminium-silicon alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent

Definitions

  • the present invention relates to aluminum alloy with superior abrasion resistance, extrusion property and forge processing property, such aluminum alloy being used for parts such as compressors in automobiles and home electric appliances.
  • Patent Literature 1 discloses an aluminum alloy for sliding use with superior fatigue resistance and seizure resistance. In order to obtain such fatigue resistance and seizure resistance, Si is added to the aluminum alloy as an essential element by 1 to 15%. However, the literature also discloses that the aluminum alloy becomes brittle when the amount of Si added exceeds 15%.
  • aluminum alloys used for compressors and the like are added with a quite amount of Si to obtain the required properties of superior abrasion resistance, rate of thermal expansion and the like.
  • Such aluminum alloys are improved in abrasion resistance, rate of thermal expansion and the like, they have problems in that processability such as extrusion processability may decrease and surface texture may deteriorate. This is observed since processability decreases by increasing the concentration of additives in the aluminum alloy.
  • Si added to the aluminum alloy for improving abrasion resistance decreases the productivity in the processes of extrusion process and forge process.
  • abrasion resistance, rate of thermal expansion and the like of the aluminum alloy often exceed the degree required for its actual use. Therefore, when such an extremely superior abrasion resistance and the like are not necessary, it is desirable to optimize the required properties (such as abrasion resistance) of the aluminum alloy within the required degree, from the view of productivity.
  • an object of the present invention is to provide an aluminum alloy of Al-Si series which possesses superior extrusion property and forge property, and also enables the production of forged products maintaining their abrasion resistance.
  • the present inventors have made a diligent investigation and found that an aluminum alloy with balanced required properties and productivity can be obtained, by adjusting the amount of each compositions and controlling the size of eutectic Si. That is, the present inventors have found that the object of the present invention can be achieved by the following means.
  • an aluminum alloy possessing superior abrasion resistance, extrusion property and forging property comprising: 5.5 to 7.0 mass% (hereinafter referred to as %) of Si, 1.0 to 2.0% of Cu, 0.4 to 0.8% of Mg, 0.05 to 0.15% of Cr, 0.05 to 0.25% of Ni, with the rest consisting of A1 and unavoidable impurities, wherein Sc (defined as the size of an eutectic Si in the central portion of the cross section which is vertical with respect to the longitudinal direction of the aluminum alloy extruded) and Ss (defined as the size of the eutectic Si at the surface side of the cross section which is vertical with respect to the longitudinal direction of the aluminum alloy extruded) satisfies an equation of "Sc-Ss ⁇ 15 ⁇ m 2 ", and the number of the eutectic Si particles having the size of 20 ⁇ m 2 or smaller is 1000 to 3000 /mm 2 , is provided.
  • Sc defined as the size of an eutectic Si in
  • an aluminum alloy with superior abrasion resistance, extrusion property and forge processing property further containing 0.01 to 0.05% of Sr is provided.
  • aluminum alloy material for manufacturing extrusion material and forged material with superior extrusion property and forge processing property, while also maintaining abrasion resistance can be provided by controlling the content of each composition and the size of the eutectic Si in the aluminum alloy.
  • FIG 1 This is a figure showing the forge processing of the extruded product manufactured by extrusion.
  • Si contributes to the improvement in abrasion resistance by forming a Si compound.
  • the amount of Si added is less than 5.5%, the effect observed for the improvement in strength and abrasion resistance is low.
  • the amount of Si added exceeds 7.0%, the surface texture deteriorates, and the extrusion property lowers.
  • Cu contributes to the improvement in strength. When the amount of Cu added is less than 1.0%, the effect observed for the improvement in strength is low. When the amount of Cu added exceeds 2.0%, the extrusion processability and corrosion resistance lowers.
  • Mg together with Si, forms Mg 2 Si and contributes to the improvement in strength.
  • the amount of Mg added is less than 0.4%, its effect is low.
  • the amount of Mg added exceeds 0.8%, the extrusion processability lowers.
  • Mg is added by 0.55 to 0.65%.
  • Cr is effective for refining the crystalline grain, and contributes to the improvement in strength.
  • amount of Cr added is less than 0.05%, such effect is low.
  • amount of Cr added exceeds 0.15%, further increase in such effect cannot be observed.
  • Cr is added by 0.07 to 0.10%.
  • Ni is effective for improving heat resistance and abrasion resistance, and also contributes to the improvement in strength.
  • the amount of Ni added is less than 0.05%, such effect is low.
  • the amount of Ni added exceeds 0.25%, further increase in such effect cannot be observed.
  • extrusion property lowers.
  • Ni is added by 0.07 to 0.13%.
  • Sr by being added, is an element which contributes to the improvement in mechanical properties. Sr is used for the modification treatment of the crystallized Si, and addition of Sr gives fine crystals of Si.
  • the amount of Sr added is preferably 0.01 to 0.05%. When the amount of Sr added is less than 0.01%, such effect is low. When the amount of Sr added exceeds 0.05%, further increase in such effect cannot be observed.
  • Fe and Mn are contained by 0.5% or less, since these elements form compounds with other additive elements and thus leads to lowering of the effects obtained by the additive elements.
  • the aluminum alloy according to the present invention consists of the afore-mentioned elements, unavoidable impurities and Al.
  • the aluminum alloy may contain a small amount of Ti, Zr or Zn in the range so long as it does not impair the effect of the present invention. Such range is 0.05% or less.
  • the uniformity of surface texture and abrasion resistance in extrusion material and forged material depend on the size and distribution of the eutectic Si in these materials, since eutectic Si have influence on such properties. That is, the aluminum alloy of the present invention attained the superior extrusion property and forge processing property by controlling the content of Si and other compositions. In addition, by controlling the size and distribution of the eutectic Si, variation in the surface texture and the properties among the portions of the material can be avoided. Therefore, the present invention can provide extrusion material and forged material having uniform properties with high productivity.
  • Ss and Sc are controlled so as to satisfy the equation of "Sc-Ss ⁇ 15 ⁇ m 2 ", the surface texture of the extrusion material becomes superior, and the variation in abrasion resistance among the surface side and the central portion of the extrusion material can be suppressed.
  • Ss is obtained as the size of eutectic Si as follows: A cross section obtained by cutting the extrusion material in the vertical direction with respect to the longitudinal direction thereof is used for the observation. The size of the eutectic Si existing slightly inward of 50 ⁇ m from the surface side of the cross section of the extrusion material is observed under an optical microscope with magnification of 100 times.
  • the size of the eutectic Si is observed for four sites, each site being placed with an interval of 90 degrees of central angle, with respect to the center of the visual field.
  • Ss refers to the largest size of eutectic Si thus observed.
  • Sc is defined as the size of eutectic Si observed at the central portion of the cross section of the extrusion material under an optical microscope with magnification of 100 times.
  • the size of eutectic Si in the present invention means the crystal area of the eutectic Si.
  • the roughness of the surface of the extrusion material can be suppressed by keeping the size of the eutectic Si contained in the extrusion material 20 ⁇ m 2 or smaller.
  • the number of eutectic Si particles should be kept in the range of 1000 to 3000 /mm 2 in order to obtain the abrasion resistance.
  • the number of eutectic Si particles with the size of 20 ⁇ m 2 or smaller is less than 1000 /mm 2 , the effect on abrasion resistance after the material being forged is low.
  • the number of eutectic Si particles exceeds 3000 /mm 2 the extrusion property and the forge processing property are inhibited.
  • thermal refining of the aluminum alloy of the present invention there is no particular limitation with respect to the production conditions and the thermal refining of the aluminum alloy of the present invention.
  • the thermal refining should be selected depending on the intended application, within the usual production conditions.
  • the type of thermal refining adopted for the extrusion material of the present invention is preferably F, T1 or O, and more preferably O.
  • T6 is preferable.
  • each of the alloy having the composition described in Table 1 was heated within the temperature range of 700°C to 740°C to give the molten aluminum alloy, and then molding was conducted using a metallic mold.
  • the amount of cooling water was adjusted to 70 to 100 L/min.
  • the samples thus obtained as the extrusion materials were subjected to observation.
  • the cross section which is vertical with respect to the longitudinal direction of the extrusion material was used for such observation.
  • the size of the eutectic Si existing slightly inward of 50 ⁇ m from the surface side of the cross section of the extrusion material was observed under an optical microscope with magnification of 100 times.
  • the largest size of the eutectic Si (Ss) was obtained by observing four sites within this visual field under the microscope, each site being placed with an interval of 90 degrees of central angle, with respect to the center of the visual field. Further, the size of eutectic Si at the central portion (Sc) was observed at the cross section of the extrusion material under an optical microscope with magnification of 100 times.
  • the size and the number of the eutectic Si particles were analyzed using the software "image analysis software A-ZO-KUN" available from Asahi Kasei Engineering Corporation. Surface texture was evaluated by stroking the surface with a pencil with hardness of HB, and the results were judged as passed "Good” when no scratch was observed, and the results were judged as failed "Not Good” when scratch was observed. The results are shown in Table 2. Samples which satisfied the predetermined criteria were judged as passed, and samples which did not meet the predetermined criteria were judged as failed.
  • the round bars were subjected to annealing treatment for five hours at 400°C to give an O-material.
  • the samples were confirmed that the size and number of eutectic Si particles were in the range of the present invention.
  • the round bars were then cut by 100mm length in the longitudinal direction, and were subsequently subjected to upset forging with the processing rate of 80%.
  • the forged products were then subjected to solution treatment for two hours at 520°C, followed by immediate heat treatment with 50°C water.
  • the forged products further went through artificial aging treatments for ten hours at 180°C to give forged products with thermal refining of T6.
  • the processing rate for the upset forging is a value obtained by calculation using the formula: (r1-r2) / r1 X 100 with respect to Fig. 1 .
  • Test pieces for the tensile strength test were prepared so that the longitudinal direction of the extrusion bar is used for the longitudinal side of the test piece.
  • the test pieces were prepared in accordance with the Japanese Industrial Standards (JIS) as test piece No. 4.
  • JIS Japanese Industrial Standards
  • the results of the test were evaluated as "passed” when the tensile strength (TS) was 300 MPa or higher, and were evaluated as “failed” when TS was lower than such value.
  • Comparative abrasion quantity was evaluated using the Ogoshi-type abrasion tester.
  • the conditions for the test were arranged as follows: gear oil (75W-90) was used as the lubricant, SCM415 was used as the opposite material, abrasion distance was set to 1200m, and the load was set to 19kgf.
  • the results of the test were evaluated as "passed” when the comparative abrasion quantity was 5.0 x 10 -9 or lower, and were evaluated as "failed” when the comparative abrasion quantity was higher than such value.
  • the extrusion materials 1 to 10 according to the present invention showed superior surface texture, while the extrusion materials of comparative Examples 11 to 17 showed inferior surface texture.
  • Examples 1 to 10 of the present invention are superior since the composition is within the preferred range. That is, their smooth surface provides superior extrusion property and thus productivity is high.
  • composition of the extrusion materials of Comparison Examples 11 to 14, 16 and 17 were out of the preferred range, and thus their surface texture caused the extrusion material to get caught during extrusion, leading to poor extrusion processability.
  • the extrusion material of Comparison Example 11 contains a large amount of Si, and the value of Sc-Ss is large. Therefore, the surface texture of the extrusion material caused the extrusion material to get caught during the extrusion, leading to poor extrusion processability.
  • the extrusion material of Comparison Example 12 contains a small amount of Si, and the value of Sc-Ss is large. Therefore, the surface texture of the extrusion material caused the extrusion material to get caught during the extrusion, leading to poor extrusion processability.
  • the extrusion material of Comparison Example 13 contains a small amount of Si and Cu. Therefore, the surface texture of the extrusion material caused the extrusion material to get caught during the extrusion, leading to poor extrusion processability.
  • the extrusion material of Comparison Example 14 contains a large amount of Si, Cu, Mg and Cr. Therefore, the surface texture of the extrusion material caused the extrusion material to get caught during the extrusion, leading to poor extrusion processability.
  • the extrusion material of Comparison Example 17 contains a large amount of Si, contains a small amount of Mg, and the value of Sc-Ss is large. Therefore, the surface texture of the extrusion material caused the extrusion material to get caught during the extrusion, leading to poor extrusion processability.
  • composition of the extrusion material of Comparison Example 15 is within the preferred range, however, the value of Sc-Ss is large. Therefore, the surface texture of the extrusion material caused the extrusion material to get caught during the extrusion, leading to poor extrusion processability.
  • Examples 1 to 10 according to the present invention showed superior appearance after forging, tensile strength and comparative abrasion quantity, while the Comparison Examples 11 to 17 showed inferior results.
  • the forged materials of Examples 1 to 10 according to the present invention showed good results in tensile strength test and possessed good comparative abrasion quantity. In addition, since the forged materials have good forge processing property, the appearance after upset forging was superior.
  • the forged material of Comparison Example 11 contains a large amount of Si in its composition. Therefore, crack is observed in the appearance of the material after upset forging. That is, the forge processing property of Comparison Example 11 is low, and thus such material is not suitable as a forge material.
  • the forged material of Comparison Example 12 contains a small amount of Si in its composition. Therefore, the tensile strength is low, and the abrasion resistance is inferior. Further, as shown in Table 2, abrasion resistance is inferior since the number of eutectic Si particles having the size of 20 ⁇ m 2 or smaller is large.
  • the forged material of Comparison Example 13 contains a small amount of Si and Cu in its composition. Therefore, the tensile strength is low, and the abrasion resistance is inferior.
  • the forged material of comparative Example 14 contains a large amount of Si, Cu, Mg and Cr. Therefore, crack is observed in the appearance of the material after upset forging. That is, the forge processing property of Comparison Example 14 is low, and thus such material is not suitable as a forge material.
  • the forged material of Comparison Example 15 has its composition within the preferred range, and thus all of the appearance after upset forging, results of the tensile strength test and the comparative abrasion quantity were satisfactory. However, as shown in Table 2, the productivity of the extrusion material of comparative Example 15 is poor due to its poor extrusion processability. Therefore, productivity of the forged material of comparison 15 is poor.
  • the forged material of Comparison Example 16 contains a large amount of Si, Cu and Sr in its composition.
  • crack is observed in the appearance of the material after upset forging since the number of eutectic Si particles having the size of 20 ⁇ m 2 or smaller is large. That is, the forge processing property of this material is poor, and is not suitable as a forged material.
  • the forged material of Comparison Example 17 contains a large amount of Si and a small amount of Mg in its composition. Accordingly, crack is observed in the appearance of the material after upset forging. That is, the forge processing property of this material is poor, and is not suitable as a forged material.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
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  • Extrusion Of Metal (AREA)

Claims (2)

  1. Produit extrudé en alliage d'aluminium présentant des qualités supérieures de résistance à l'abrasion, d'extrusion et de forgeage, comprenant :
    de 5,5 à 7,0 % en masse (ci-après abrégé en : %) de Si, de 1,0 à 2,0 % de Cu, de 0,4 à 0,8 % de Mg, de 0,05 à 0,15 % de Cr, de 0,05 à 0,25 % de Ni, le reste consistant en Al, 0,5 % ou moins de Fe et de Mn, et en impuretés inévitables, où
    Sc (définie comme la dimension de Si eutectique dans la partie centrale de la section transversale du produit extrudé, perpendiculaire au sens de la longueur du produit extrudé) et Ss (définie comme la dimension de Si eutectique sur le côté de surface de la section transversale, perpendiculaire au sens de la longueur du produit extrudé) satisfont à l'équation : ʺSc − Sc ≤ 15 µ m 2 ʺ ,
    Figure imgb0005
     et où
    le nombre de particules de Si eutectique présentant une dimension égale ou inférieure à 20 µm2 est compris de 1000 à 3000 par mm2.
  2. Produit extrudé selon la revendication 1, comprenant en outre de 0,01 à 0,05 % de Sr.
EP12867174.0A 2012-02-01 2012-02-01 Alliage d'aluminium présentant une résistance à l'usure, une aptitude à l'extrusion et une aptitude au façonnage par forgeage d'excellente qualité Active EP2811041B1 (fr)

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DE112017004089A5 (de) * 2016-08-15 2019-05-09 Ksm Castings Group Gmbh Al-Gusslegierung
CN108193094A (zh) * 2018-01-22 2018-06-22 湖北大旗液压有限公司 用于齿轮泵浮动侧板的耐磨铝合金材料及其制备方法
JP7318283B2 (ja) * 2019-04-05 2023-08-01 株式会社レゾナック コンプレッサー摺動部品用アルミニウム合金およびコンプレッサー摺動部品鍛造品

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JPH01104742A (ja) * 1987-10-16 1989-04-21 Furukawa Alum Co Ltd 耐摩耗性アルミニウム合金
JPH036345A (ja) 1989-06-02 1991-01-11 Daido Metal Co Ltd 耐疲労性と非焼付性にすぐれた摺動用アルミニウム基合金
JPH05287427A (ja) * 1992-04-08 1993-11-02 Furukawa Alum Co Ltd 冷間鍛造用耐摩耗性アルミニウム合金とその製造方法
JPH07197164A (ja) * 1993-12-28 1995-08-01 Furukawa Electric Co Ltd:The 高強度高加工性アルミニウム合金とその製造方法
JPH0828493A (ja) * 1994-07-14 1996-01-30 Furukawa Electric Co Ltd:The アルミニウム合金製スクロールの製造方法
JP3261056B2 (ja) * 1997-01-14 2002-02-25 住友軽金属工業株式会社 陽極酸化皮膜の形成容易性および皮膜厚の均一性に優れた高強度耐摩耗性アルミニウム合金押出材およびその製造方法
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MY155638A (en) * 2009-01-27 2015-11-13 Daiki Aluminium Industry Co Ltd An aluminum alloy for pressure casting and an alumium alloy cast made of the same

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CN104160049A (zh) 2014-11-19
EP2811041A4 (fr) 2015-09-02
CN104160049B (zh) 2016-09-14
EP2811041A1 (fr) 2014-12-10

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