EP0263373A2 - Procédé de préparation d'un alliage fritté résistant à l'abrasion - Google Patents

Procédé de préparation d'un alliage fritté résistant à l'abrasion Download PDF

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Publication number
EP0263373A2
EP0263373A2 EP87114025A EP87114025A EP0263373A2 EP 0263373 A2 EP0263373 A2 EP 0263373A2 EP 87114025 A EP87114025 A EP 87114025A EP 87114025 A EP87114025 A EP 87114025A EP 0263373 A2 EP0263373 A2 EP 0263373A2
Authority
EP
European Patent Office
Prior art keywords
weight
phosphorus
alloy
sintered alloy
wear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP87114025A
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German (de)
English (en)
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EP0263373B1 (fr
EP0263373A3 (en
Inventor
Karl Leithner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Supervis
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Supervis
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Publication date
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Priority to AT87114025T priority Critical patent/ATE77846T1/de
Publication of EP0263373A2 publication Critical patent/EP0263373A2/fr
Publication of EP0263373A3 publication Critical patent/EP0263373A3/de
Application granted granted Critical
Publication of EP0263373B1 publication Critical patent/EP0263373B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%

Definitions

  • the aim of the invention is therefore to propose a method for producing a highly wear-resistant sintered alloy with phosphorus additive, with which mass parts can be produced in essentially conventional sintering technology and without additional hardening treatment, with regard to their wear properties of castings are equivalent. They should have a surface hardness of approx. 50 Rockwell (RC) and only a slight shrinkage, so the powder must be easy to compress.
  • the workpiece manufactured with this sintered alloy should retain the character of powder metallurgical production, so it should have a not inconsiderable proportion of pores, which experience has shown to have a positive effect on the emergency running properties.
  • the method for producing the sintered alloy for solving this complex problem is defined by the features of the characterizing part of patent claim 1.
  • the method according to the invention for producing the highly wear-resistant sintered alloy is characterized in that the carbon content by weight is up to 5 times as large as the phosphorus content.
  • Bulk parts made from this alloy according to the invention do not have to be subjected to a hardening process, they have surface hardnesses in the range of approx. 50 Rockwell (RC) and only slight shrinkage or only slight growth. They also have the character of a powder metallurgically manufactured workpiece, that is to say they have a relatively high proportion of pores, which favors the emergency running properties.
  • the constituents of the sintered alloy are mixed in elemental form with iron powder or diffusion alloyed, the powder obtained in this way is shaped in a press tool to the desired part under pressure, for example under pressures of 400-1000 N / mm 2 and then at about 1120 ° C.
  • Fig. 1 shows a micrograph (500 times magnification). The cut was in conventionally manufactured. This alloy has small rounded pores. The pores are mainly on the crown boundaries marked by the cementite network. In various places there are smaller pores in the middle of the grain.
  • the cementite network can be seen in the micrograph as a white network. It encloses almost all grains. Its thickness is less than 3 ⁇ m, in most places the thickness is 1 ⁇ m.
  • the white dots that can be seen in a few places inside the grain are cementite balls.
  • the structure of the grains consists of acicular (needle-like) martensite, which is embedded in residual austenite.
  • the martensite appears in the form of dark needles, the resaustenite lies in between.
  • a volume fraction of 40% for the residual austenite is to be expected with this alloy.
  • a volume fraction of 14% there are areas rich in austenite (light spots in Fig. 1), which are partially intersected by the cementite network.
  • the slight gray coloration of the residual austenite could indicate a partial transformation into lower bainite by the tempering treatment.
  • Residual austenite can have an adverse effect on the dimensional stability of the components. Nevertheless, the appearance of residual austenite in the structure does not have to be a disadvantage in terms of wear. With increasing volume of residual austenite, the resistance to abrasive wear increases. The conversion of the residual austenite into bainite represents an advantage in the case of sliding wear. With the same hardness, a bainitic structure has better sliding wear properties than a martensitic one.
  • micro load hardness tests showed a hardness of 612 ⁇ 23 HV 0.05 for the martensitic grains. In areas with a high proportion of austenite (or lower bainite), the hardness is significantly lower at 476 ⁇ 88.
  • Fig. 2 shows the micrograph (500 times magnification).
  • the pores of this alloy are larger and better rounded than those of the alloy discussed first. They are preferably at triple grain boundary points, less often between two grains and only in a few cases inside the grain. The better rounding indicates an increased liquid phase during sintering.
  • the cementite network is stronger than that of the alloy discussed first. It encloses all grains.
  • the thickness is between 1 ⁇ m and 15 ⁇ m, with particularly wide areas of the cementite network being observed at triple grain boundary points.
  • the cementite grains that occur sporadically in the alloy discussed first occur here increasingly.
  • Well-rounded cementite grains (hardness 1018 HV 0.025) can be seen in almost every grain.
  • the martensitic areas are somewhat harder than those of the alloy discussed first. In contrast, the remaining austenite areas are softer at 353 ⁇ 36 HV 0.05.
  • the cementite network has the expected hardness of 1035 ⁇ 67 HV 0.05.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
EP87114025A 1986-10-04 1987-09-25 Procédé de préparation d'un alliage fritté résistant à l'abrasion Expired - Lifetime EP0263373B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87114025T ATE77846T1 (de) 1986-10-04 1987-09-25 Verfahren zur herstellung einer hochverschleissfesten sinterlegierung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3633879 1986-10-04
DE19863633879 DE3633879A1 (de) 1986-10-04 1986-10-04 Hochverschleissfeste eisen-nickel-kupfer-molybdaen-sinterlegierung mit phosphorzusatz

Publications (3)

Publication Number Publication Date
EP0263373A2 true EP0263373A2 (fr) 1988-04-13
EP0263373A3 EP0263373A3 (en) 1989-08-02
EP0263373B1 EP0263373B1 (fr) 1992-07-01

Family

ID=6311076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87114025A Expired - Lifetime EP0263373B1 (fr) 1986-10-04 1987-09-25 Procédé de préparation d'un alliage fritté résistant à l'abrasion

Country Status (5)

Country Link
US (1) US4909843A (fr)
EP (1) EP0263373B1 (fr)
AT (1) ATE77846T1 (fr)
DE (2) DE3633879A1 (fr)
ES (1) ES2033761T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995032827A1 (fr) * 1994-05-27 1995-12-07 Höganäs Ab Poudre a base de fer contenant du mo, du p et du c

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3520093B2 (ja) * 1991-02-27 2004-04-19 本田技研工業株式会社 二次硬化型高温耐摩耗性焼結合金
GB9405946D0 (en) * 1994-03-25 1994-05-11 Brico Eng Sintered valve seat insert
US5552109A (en) * 1995-06-29 1996-09-03 Shivanath; Rohith Hi-density sintered alloy and spheroidization method for pre-alloyed powders
JP3447030B2 (ja) * 1996-01-19 2003-09-16 日立粉末冶金株式会社 耐摩耗性焼結合金およびその製造方法

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS549127B2 (fr) * 1971-06-28 1979-04-21
US3837816A (en) * 1972-09-05 1974-09-24 Nippon Piston Ring Co Ltd Thermal and abrasion resistant sintered alloy
DE2613255C2 (de) * 1976-03-27 1982-07-29 Robert Bosch Gmbh, 7000 Stuttgart Verwendung einer Eisen-Molybdän-Nickel-Sinterlegierung mit Phosphorzusatz zur Herstellung hochfester Werkstücke
SE7612279L (sv) * 1976-11-05 1978-05-05 British Steel Corp Finfordelat glodgat stalpulver, samt sett att framstella detta.
GB1576143A (en) * 1977-07-20 1980-10-01 Brico Eng Sintered metal articles
JPS609587B2 (ja) * 1978-06-23 1985-03-11 トヨタ自動車株式会社 耐摩耗性焼結合金
US4170474A (en) * 1978-10-23 1979-10-09 Pitney-Bowes Powder metal composition
JPS55145151A (en) * 1979-04-26 1980-11-12 Nippon Piston Ring Co Ltd Wear resistant sintered alloy material for internal combustion engine
JPS55145152A (en) * 1979-04-26 1980-11-12 Nippon Piston Ring Co Ltd Sintered alloy material for internal combustion engine
JPS55164060A (en) * 1979-05-07 1980-12-20 Nippon Piston Ring Co Ltd Abrasion resistant iron-based sintered alloy material
JPS5918463B2 (ja) * 1980-03-04 1984-04-27 トヨタ自動車株式会社 耐摩耗性焼結合金およびその製法
JPS5767148A (en) * 1980-10-09 1982-04-23 Mitsubishi Metal Corp Sintered roller chain bush containing coil
JPS5881954A (ja) * 1981-11-09 1983-05-17 Mitsubishi Metal Corp 耐摩耗性および自己潤滑性にすぐれた高強度鉄基焼結合金
JPS6070163A (ja) * 1983-09-28 1985-04-20 Nippon Piston Ring Co Ltd 耐摩耗性焼結合金部材
JPS6075501A (ja) * 1983-09-29 1985-04-27 Kawasaki Steel Corp 高強度焼結部品用の合金鋼粉
JPS60152658A (ja) * 1984-01-20 1985-08-10 Nissan Motor Co Ltd 耐摩耗性焼結合金
JPS60169541A (ja) * 1984-02-10 1985-09-03 Hitachi Powdered Metals Co Ltd 析出硬化型焼結合金の製造方法
JPS61243156A (ja) * 1985-04-17 1986-10-29 Hitachi Powdered Metals Co Ltd 耐摩耗性鉄系焼結合金およびその製造方法
AT382334B (de) * 1985-04-30 1987-02-10 Miba Sintermetall Ag Nocken zum aufschrumpfen auf einer nockenwelle und verfahren zur herstellung eines solchen nockens durch sintern
JPS62271914A (ja) * 1986-04-11 1987-11-26 Nippon Piston Ring Co Ltd 焼結カムシヤフト

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995032827A1 (fr) * 1994-05-27 1995-12-07 Höganäs Ab Poudre a base de fer contenant du mo, du p et du c

Also Published As

Publication number Publication date
US4909843A (en) 1990-03-20
DE3633879A1 (de) 1988-04-14
ES2033761T3 (es) 1993-04-01
DE3633879C2 (fr) 1992-01-16
DE3780114D1 (de) 1992-08-06
ATE77846T1 (de) 1992-07-15
EP0263373B1 (fr) 1992-07-01
EP0263373A3 (en) 1989-08-02

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