GB2262943A - A nitrogen-strengthened alloy - Google Patents

A nitrogen-strengthened alloy Download PDF

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Publication number
GB2262943A
GB2262943A GB9226891A GB9226891A GB2262943A GB 2262943 A GB2262943 A GB 2262943A GB 9226891 A GB9226891 A GB 9226891A GB 9226891 A GB9226891 A GB 9226891A GB 2262943 A GB2262943 A GB 2262943A
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United Kingdom
Prior art keywords
alloy
nitride
nitrogen
strengthened
donor
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
GB9226891A
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GB9226891D0 (en
Inventor
David Martin Jaeger
Michael Farrow
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UK Atomic Energy Authority
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UK Atomic Energy Authority
Priority date (The priority date 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 date listed.)
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Publication date
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Publication of GB9226891D0 publication Critical patent/GB9226891D0/en
Publication of GB2262943A publication Critical patent/GB2262943A/en
Withdrawn legal-status Critical Current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
    • C22C33/0278—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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

A nitrogen-strengthened alloy including at least 5 <v>/o of a nitride such as to strengthen the alloy. Methods of manufacturing the alloy also are described.

Description

A Nitroqen-Strenqthened Alloy This invention relates to a nitrogen-strengthened alloy and the production thereOF.
According to one aspect of the present invention, there is provided a nitrogen-strengthened alloy, the alloy containing at least 5V/o of a nitride thereby to enhance the wear resistance properties of the alloy.
According to a second aspect, the invention provides a method of producing a nitrogen-strengthened alloy, the method comprising heating a combination comprising alloy particles or a permeable agglomeration thereof, a nitrogen donor, and a nitride former to a temperature such that the nitrogen donor and nitride former react together, the proportions of the nitrogen donor and the nitride former in the combination being such as to provide a concentration of the nitride in the alloy of at least 5 v/O.
Desirably, the nitride constitutes between 5 and 20V/o of the alloy, preferably about 10V/o.
Conveniently, the nitrogen donor comprises a metallic nitride which dissociates within the temperature range of 5000C to 13000C, the preferred nitrogen donor being chromium nitride, for example as CrN and/or Cr2N.
Preferably, the nitride comprises titanium nitride.
Advantageously, a slight excess of the nitrogen donor may be used to provide an excess of nitrogen to form a solid solution in the alloy and to thereby enhance the corrosion resistance thereof. An excess of nitrogen of up to about 0.6W/o has particular advantages.
In one form of the invention, the alloy may comprise an austenitic stainless steel, for example a 20Cr/25Ni stainless steel.
The enhanced wear resistance and the anti-galling properties of the alloy produced by the invention make the alloy suitable for many applications such as fasteners, bolts, impellers, and for tribological applications. When an excess of nitrogen is provided, the improved corrosion resistance of the alloy increases its pitting resistance. The alloy of the invention should also have an increased proof stress.
The alloy may be made by the method described in European Patents Specification No. 0 363 047 (United States Patent Application Serial No. 409 736 filed 20th September 1989) which is incorporated by reference herein. In this method the quantity of the nitride donor may be precisely controlled to provide a required release of nitrogen in the alloy when the donor is heated to cause it to dissociate.
It has been found that the inclusion of about 5V/o of titanium nitride increases the wear resistance of an austenitic stainless steel alloy by about a factor of 10, and further improvements can be expected with increasing titanium nitride content.
Examples of alloys according to the invention are as follows:
Proportions in Wt % C C Si Mn Cr Ni Mo TiN I 0.08 1.00 2.00 16-18 10-14 2-3 5 II 0.08 1.00 2.00 18-20 8-12 5

Claims (17)

  1. Claims 1. A nitrogen-strengthened alloy, the alloy containing at least 5V/o of a nitride thereby to enhance the wear resistance properties of the alloy.
  2. 2. An alloy according to Claim 1 wherein the nitride constitutes between 5 and 20V/o of the alloy.
  3. 3. An alloy according to Claim 2 wherein the nitride constitutes about 5V/o of the alloy.
  4. 4. An alloy according to any of Claims 1 to 3 wherein there is included nitrogen in solid solution in the alloy.
  5. 5. An alloy according to Claim 4 wherein the concentration of nitrogen in solid solution in the alloy is about 0.6W/o.
  6. 6. An alloy according to any preceding Claim in the form of an austenitic stainless steel.
  7. 7. An alloy according to Claim 6 wherein the stainless steel is a 20 Cr/25 Ni stainless steel.
  8. 8. An alloy according to any of Claims 1 to 7 wherein the nitride is titanium nitride.
  9. 9. An alloy according to Claim 8 wherein the alloy has the composition (wt %):- 0.08 C, 1.00 Si, 2.00 Mn, 16-18 Cr, 10-14 Ni, 2-3 Mn, 5 TiN.
  10. 10. An alloy according to Claim 8 wherein the alloy has the composition (wt %):- 0.08 C, 1.00 Si, 2.00 Mn, 18-20 Cr, 8-12 Ni, 5 TiN.
  11. 11. A method of producing a nitrogen-strengthened alloy, comprising the operation of heating a combination comprising alloy particles or a permeable conglomeration thereof, a nitrogen donor and a nitride former to a temperature such that the nitrogen donor and nitride former react to produce the nitride, the proportions of the nitrogen donor and the nitride former in the combination being such as to provide a concentration of the nitride in the alloy of at least 5V/O.
  12. 12. A method according to Claim 11 wherein the nitrogen donor comprises a metallic nitride which dissociates within the temperature range 5000C to 13000C and the combination of alloy, nitrogen donor and nitride former is heated to a temperature within that range of temperatures.
  13. 13 A method according to Claim 12 wherein the nitrogen donor is chromium nitride.
  14. 14. A method according to Claim 13 wherein the chromium nitride is CrN and/or Cr2N.
  15. 15. A method according to any of Claims 11 to 14 wherein the nitride is titanium nitride.
  16. 16. A nitrogen-strengthened alloy substantially as hereinbefore described.
  17. 17. A method of producing a nitrogen-strengthened alloy substantially as hereinbefore described.
GB9226891A 1991-12-27 1992-12-22 A nitrogen-strengthened alloy Withdrawn GB2262943A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB919127416A GB9127416D0 (en) 1991-12-27 1991-12-27 A nitrogen-strengthened alloy

Publications (2)

Publication Number Publication Date
GB9226891D0 GB9226891D0 (en) 1993-02-17
GB2262943A true GB2262943A (en) 1993-07-07

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Family Applications (2)

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GB919127416A Pending GB9127416D0 (en) 1991-12-27 1991-12-27 A nitrogen-strengthened alloy
GB9226891A Withdrawn GB2262943A (en) 1991-12-27 1992-12-22 A nitrogen-strengthened alloy

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GB919127416A Pending GB9127416D0 (en) 1991-12-27 1991-12-27 A nitrogen-strengthened alloy

Country Status (1)

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GB (2) GB9127416D0 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180724A2 (en) * 1984-11-08 1986-05-14 Kabushiki Kaisha Toshiba Aluminum nitride sintered body and process for producing the same
GB2177421A (en) * 1985-05-20 1987-01-21 Toshiba Ceramics Co Sintered body of silicon carbide
WO1987000556A1 (en) * 1985-07-26 1987-01-29 Research Corporation An oxidation resistant alloy
US4911756A (en) * 1985-12-28 1990-03-27 Sumitomo Electric Industries, Ltd. Hard sintered compact for tools
EP0363047A1 (en) * 1988-10-05 1990-04-11 United Kingdom Atomic Energy Authority A method of producing nitrogen strengthened alloys
WO1990010090A1 (en) * 1989-02-22 1990-09-07 Sumitomo Electric Industries, Ltd. Nitrogen-containing cermet
US4983212A (en) * 1987-10-26 1991-01-08 Hitachi Metals, Ltd. Cermet alloys and composite mechanical parts made by employing them
US5015290A (en) * 1988-01-22 1991-05-14 The Dow Chemical Company Ductile Ni3 Al alloys as bonding agents for ceramic materials in cutting tools
US5045512A (en) * 1989-12-15 1991-09-03 Elektroschmelzwerk Kempten Gmbh Mixed sintered metal materials based on borides, nitrides and iron binder metals

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0180724A2 (en) * 1984-11-08 1986-05-14 Kabushiki Kaisha Toshiba Aluminum nitride sintered body and process for producing the same
GB2177421A (en) * 1985-05-20 1987-01-21 Toshiba Ceramics Co Sintered body of silicon carbide
WO1987000556A1 (en) * 1985-07-26 1987-01-29 Research Corporation An oxidation resistant alloy
US4911756A (en) * 1985-12-28 1990-03-27 Sumitomo Electric Industries, Ltd. Hard sintered compact for tools
US4983212A (en) * 1987-10-26 1991-01-08 Hitachi Metals, Ltd. Cermet alloys and composite mechanical parts made by employing them
US5015290A (en) * 1988-01-22 1991-05-14 The Dow Chemical Company Ductile Ni3 Al alloys as bonding agents for ceramic materials in cutting tools
EP0363047A1 (en) * 1988-10-05 1990-04-11 United Kingdom Atomic Energy Authority A method of producing nitrogen strengthened alloys
WO1990010090A1 (en) * 1989-02-22 1990-09-07 Sumitomo Electric Industries, Ltd. Nitrogen-containing cermet
US5045512A (en) * 1989-12-15 1991-09-03 Elektroschmelzwerk Kempten Gmbh Mixed sintered metal materials based on borides, nitrides and iron binder metals

Also Published As

Publication number Publication date
GB9226891D0 (en) 1993-02-17
GB9127416D0 (en) 1992-02-19

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