US3380861A - Sintered steel-bonded carbide hard alloys - Google Patents

Sintered steel-bonded carbide hard alloys Download PDF

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Publication number
US3380861A
US3380861A US453494A US45349465A US3380861A US 3380861 A US3380861 A US 3380861A US 453494 A US453494 A US 453494A US 45349465 A US45349465 A US 45349465A US 3380861 A US3380861 A US 3380861A
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carbide
steel
alloys
sintered
hard
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US453494A
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English (en)
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Frehn Fritz
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Deutsche Edelstahlwerke AG
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Deutsche Edelstahlwerke AG
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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
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C29/00—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides
    • C22C29/02—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides
    • C22C29/06—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds
    • C22C29/067—Alloys based on carbides, oxides, nitrides, borides, or silicides, e.g. cermets, or other metal compounds, e.g. oxynitrides, sulfides based on carbides or carbonitrides based on carbides, but not containing other metal compounds comprising a particular metallic binder

Definitions

  • ABSTRACT OF THE DISCLOSURE In sintered steel-bonded carbide hard alloys of the type comprising a steel matrix of steel hardenable by the transformation of austenite containing TiC (or a mixture of TiC with equivalent carbides), the hardness of the sinter is preserved when tempered if the steel matrix contains from 0.5 to 3% of copper.
  • the invention relates to sintered steel-bonded carbide hard alloys in which a matrix of steel that is hardenable by the transformation of austenite contains the carbide in quantities between 12.5% and 72% by weight, and the carbide is titanum carbide of which up to 50% may be replaced by one or more carbides of metals of Groups IV to VI of the Periodic Table.
  • the group of steel-bonded titanium carbide hard alloys has been known for some time, but its technological evaluation did not begin until quite recently.
  • the entire group of these particular hard metals can be divided, according to the nature of the steel matrix, into hardenable and non-hardenable alloys which can be used in diverse fields where their different technological properties are useful.
  • a matrix of the hardenable type is one that can be hardened either by the transformation of austenite, that is to say by the formation of martensite, or by precipitation.
  • This last named group includes known hard metals based on steels with a high titanium and/or tungsten content, which are first solution treated at 1000 C. and then tempered at between 300 and 500 C. when they precipitate a phase rich in titanium and/or tungsten.
  • the reheat stability of these alloys is roughly equal to that of the steel matrix so that generally speaking hard alloys that are hardenable by martensite formation can be used only for the purpose of cold shaping and for the production of abrasion-proof parts, whereas the more reheat-resistant precipitation hardenable alloys can also be machined and hot shaped.
  • the general composition of the steel-bonded titanium carbide hard metals can be defined as being 12 /2 and 75% by weight of titanium carbide, the remaining matrix consisting of transformation-hardenable or precipitationhardenable steel.
  • alloys are used containing 27 to 37% by weight of titanium carbide, corresponding to about 40 to 55% by volume of TiC.
  • the steel matrix may be any alloy desired to provide wanted properties. Up to 50% of the titanium carbide tiself may be replaced by other known hard carbides, such as tungsten carbide, vanadium carbide, zirconium carbide, niobium carbide, tantalum carbide, chromium carbide and so forth.
  • the present invention relates to titanum carbide hard metals of the specified kind consisting of a steel matrix which in virtue of its particular composition is hardenable either by martensite formation or by precipitation.
  • the proposed alloys are characterised inthat the steel matrix which is hardenable by the transformation of austenite contains between 0.5 and 3.0%, of copper.
  • This particularly useful property of the novel hard metal alloys permits the sintered alloys, after having been hardened by quenching from 950 to 1000 C. in oil, to be reheated for 0.5 to 2 hours, preferably for one hour, for the removal of internal stress at temperatures between 150 and 500 C., preferably at the temperature at which the hard metal alloy is expected to be further processed. The stresses in the workpiece are thus removed and its impact resistance and bending strength further improved.
  • the known precipitation hardenable matrix alloys differ from alloys composed as proposed by the present invention in that they contain the elements titanium or tungsten for forming the precipitating phases. Both elements are strong carbide formers and they react with excess carbon or carbon liberated by titanium decomposition. It is therefore extremely difiicult in practice to control the degree of hardening.
  • the carbide hard metals composed as herein proposed are produced by powder metallurgical techniques in the same way as the known materials.
  • the component powders are mixed, ground down to a grain size between 3 and 5a, the powder mixture being then moulded and finally sintered at about 1400 C. for 2 hours in a vacuum below 10'- torr.
  • the sintered mouldings are then cooled to room temperature. After having been annealed at between 700 and 750 C., the hardness of the resultant sintered parts is between 38 and 42 Re. In this condition they can be machined. When they have been hardened the parts have a hardness between and 73 Re.
  • the appended diagrams illustrate the relationship between high-temperature hardness and working temperature.
  • the measurements were performed, on the one hand, on a sample consisting of normal steel-bonded titanium carbide hard metal and, on the other hand, on an alloy according to the invention containing 2% Cu.
  • the composition of the examined hard metals is given in Table I.
  • Curve I in this diagram illustrates the change in hardness of a normal steelbonded carbide hard metal
  • curve 11 is that of a hard metal according to the invention containing 2% Cu.
  • the hardness of the hard metal according to the invention remains substantially the same up to 500 C., whereas the hardness of the normal steel-bonded titanium carbide hard metal has already diminished considerably at 150 C. Above 500 C. the hardness of the hard metal according to the invention also begins to decline, but it nevertheless still remains above that of the normal steel-bonded titanium carbide hard metal.
  • the table clearly shows that the hardness declines considerably when the copper content rises to over 3% and that there is then no hardening or age hardening effect.
  • the reason for this may be that although the high copper content reduces the sinter temperature of the alloy and would therefore permit the alloy to be sintered at lower temperatures, the steel matrix nevertheless requires high temperatures for forming the alloy. When the copper content exceeds 5% the sintering temperature would therefore have to be 30 to 50 C. lower to prevent the copper from running out or from evaporating at too high a rate. However, the steel matrix would then not be thoroughly sintered and the formation of the alloy would be incomplete so that no hardening by the transformation of austenite (for instance by martensite formation) nor by copper precipitation when reheating is possible.
  • titanium carbide Up to 50% of the titanium carbide may be replaced, as previously stated, by one or more other hard carbides.
  • a sintered steel-bonded carbide hard metal according to claim 1 in which at least one said hard carbide other than titanium carbide is present in the alloy in a content of up to 36% by weight of the alloy.
  • a method for forming treated, steel-bonded hard carbide alloy molding comprising:

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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)
US453494A 1964-05-06 1965-05-05 Sintered steel-bonded carbide hard alloys Expired - Lifetime US3380861A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED44355A DE1219239B (de) 1964-05-06 1964-05-06 Gesinterte, stahlgebundene Karbid-Hartlegierung

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US3380861A true US3380861A (en) 1968-04-30

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US (1) US3380861A (de)
AT (1) AT262631B (de)
CH (1) CH482025A (de)
DE (1) DE1219239B (de)
GB (1) GB1074405A (de)
SE (1) SE352904B (de)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3421950A (en) * 1965-09-14 1969-01-14 Deutsche Edelstahlwerke Ag Method of heat-treating workpieces
US3450528A (en) * 1968-07-25 1969-06-17 Crucible Steel Corp Method for producing dispersioned hardenable steel
US3450511A (en) * 1967-11-10 1969-06-17 Deutsche Edelstahlwerke Ag Sintered carbide hard alloy
US3492101A (en) * 1967-05-10 1970-01-27 Chromalloy American Corp Work-hardenable refractory carbide tool steels
US3653982A (en) * 1969-12-18 1972-04-04 Chromalloy American Corp Temper resistant chromium-containing titanium carbide tool steel
US3715792A (en) * 1970-10-21 1973-02-13 Chromalloy American Corp Powder metallurgy sintered corrosion and wear resistant high chromium refractory carbide alloy
US3771975A (en) * 1970-07-16 1973-11-13 Deutsche Edelstahlwerke Ag Sinter metal alloy
US3800891A (en) * 1968-04-18 1974-04-02 Hughes Tool Co Hardfacing compositions and gage hardfacing on rolling cutter rock bits
US3807970A (en) * 1964-09-09 1974-04-30 C Greene Drill proof plate for safes
US3819364A (en) * 1972-09-29 1974-06-25 Deutsche Edelstahlwerke Gmbh Welding hard metal composition
US3942954A (en) * 1970-01-05 1976-03-09 Deutsche Edelstahlwerke Aktiengesellschaft Sintering steel-bonded carbide hard alloy
US3989554A (en) * 1973-06-18 1976-11-02 Hughes Tool Company Composite hardfacing of air hardening steel and particles of tungsten carbide
US4844738A (en) * 1986-10-31 1989-07-04 Mitsubishi Kinzoku Kabushiki Kaisha Carbide-dispersed type Fe-base sintered alloy excellent in wear resistance
US5358545A (en) * 1990-09-18 1994-10-25 Carmet Company Corrosion resistant composition for wear products

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3966423A (en) 1973-11-06 1976-06-29 Mal M Kumar Grain refinement of titanium carbide tool steel
AT388394B (de) * 1987-01-09 1989-06-12 Vni Instrument Inst Verfahren zur herstellung von schneidwerkzeug
RU2294261C1 (ru) * 2005-06-15 2007-02-27 Государственное образовательное учреждение высшего профессионального образования СИБИРСКИЙ ГОСУДАРСТВЕННЫЙ ИНДУСТРИАЛЬНЫЙ УНИВЕРСИТЕТ Способ закалки твердого сплава
RU2355513C1 (ru) * 2007-09-11 2009-05-20 Государственное образовательное учреждение высшего профессионального образования "Сибирский государственный индустриальный университет" Способ закалки твердого сплава на основе карбида вольфрама
RU2356693C1 (ru) * 2007-10-22 2009-05-27 Государственное образовательное учреждение высшего профессионального образования "Сибирский государственный индустриальный университет" Способ закалки твердого сплава
RU2392342C1 (ru) * 2009-05-04 2010-06-20 Государственное образовательное учреждение высшего профессионального образования "Сибирский государственный индустриальный университет" Способ закалки твердого сплава на основе карбида вольфрама

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683677A (en) * 1942-07-27 1954-07-13 Jr Francis M Walters Method of precipitation hardening iron alloys
US2694626A (en) * 1950-08-25 1954-11-16 Armco Steel Corp Stainless steels
US2828202A (en) * 1954-10-08 1958-03-25 Sintercast Corp America Titanium tool steel
US2868638A (en) * 1956-02-09 1959-01-13 Cooper Alloy Corp Precipitation hardenable, corrosion resistant, chromium-nickel stainless steel alloy
US2891858A (en) * 1955-09-28 1959-06-23 Carpenter Steel Co Single phase austenitic alloy steel
US3053706A (en) * 1959-04-27 1962-09-11 134 Woodworth Corp Heat treatable tool steel of high carbide content
US3183127A (en) * 1959-04-27 1965-05-11 Chromalloy Corp Heat treatable tool steel of high carbide content

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2683677A (en) * 1942-07-27 1954-07-13 Jr Francis M Walters Method of precipitation hardening iron alloys
US2694626A (en) * 1950-08-25 1954-11-16 Armco Steel Corp Stainless steels
US2828202A (en) * 1954-10-08 1958-03-25 Sintercast Corp America Titanium tool steel
US2891858A (en) * 1955-09-28 1959-06-23 Carpenter Steel Co Single phase austenitic alloy steel
US2868638A (en) * 1956-02-09 1959-01-13 Cooper Alloy Corp Precipitation hardenable, corrosion resistant, chromium-nickel stainless steel alloy
US3053706A (en) * 1959-04-27 1962-09-11 134 Woodworth Corp Heat treatable tool steel of high carbide content
US3183127A (en) * 1959-04-27 1965-05-11 Chromalloy Corp Heat treatable tool steel of high carbide content

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3807970A (en) * 1964-09-09 1974-04-30 C Greene Drill proof plate for safes
US3421950A (en) * 1965-09-14 1969-01-14 Deutsche Edelstahlwerke Ag Method of heat-treating workpieces
US3492101A (en) * 1967-05-10 1970-01-27 Chromalloy American Corp Work-hardenable refractory carbide tool steels
US3450511A (en) * 1967-11-10 1969-06-17 Deutsche Edelstahlwerke Ag Sintered carbide hard alloy
US3800891A (en) * 1968-04-18 1974-04-02 Hughes Tool Co Hardfacing compositions and gage hardfacing on rolling cutter rock bits
US3450528A (en) * 1968-07-25 1969-06-17 Crucible Steel Corp Method for producing dispersioned hardenable steel
US3653982A (en) * 1969-12-18 1972-04-04 Chromalloy American Corp Temper resistant chromium-containing titanium carbide tool steel
US3942954A (en) * 1970-01-05 1976-03-09 Deutsche Edelstahlwerke Aktiengesellschaft Sintering steel-bonded carbide hard alloy
US3771975A (en) * 1970-07-16 1973-11-13 Deutsche Edelstahlwerke Ag Sinter metal alloy
US3715792A (en) * 1970-10-21 1973-02-13 Chromalloy American Corp Powder metallurgy sintered corrosion and wear resistant high chromium refractory carbide alloy
US3819364A (en) * 1972-09-29 1974-06-25 Deutsche Edelstahlwerke Gmbh Welding hard metal composition
US3989554A (en) * 1973-06-18 1976-11-02 Hughes Tool Company Composite hardfacing of air hardening steel and particles of tungsten carbide
US4844738A (en) * 1986-10-31 1989-07-04 Mitsubishi Kinzoku Kabushiki Kaisha Carbide-dispersed type Fe-base sintered alloy excellent in wear resistance
US5358545A (en) * 1990-09-18 1994-10-25 Carmet Company Corrosion resistant composition for wear products

Also Published As

Publication number Publication date
AT262631B (de) 1968-06-25
DE1219239B (de) 1966-06-16
GB1074405A (en) 1967-07-05
CH482025A (de) 1969-11-30
SE352904B (de) 1973-01-15

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