Method for solution hardening of a cold deformed workpiece of a passive alloy, and a member solution hardened by the method
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C21D-001/06
C23C-008/02
C23C-008/26
C23C-008/32
C23C-008/34
C23C-008/80
C21D-006/00
C21D-009/00
C23C-008/38
F16B-039/22
출원번호
US-0397373
(2013-04-25)
등록번호
US-10023924
(2018-07-17)
우선권정보
WO-PCT/DK2012/050139 (2012-04-27)
국제출원번호
PCT/DK2013/050119
(2013-04-25)
국제공개번호
WO2013/159781
(2013-10-31)
발명자
/ 주소
Christiansen, Thomas Lundin
Hummelshoj, Thomas Strabo
Somers, Marcel A. J.
출원인 / 주소
EXPANITE TECHNOLOGY A/S
대리인 / 주소
Buchanan Ingersoll & Rooney P.C.
인용정보
피인용 횟수 :
0인용 특허 :
1
초록▼
A method for method for solution hardening of a cold deformed workpiece of a passive alloy containing at least 10% chromium, which method includes dissolving at least nitrogen in the workpiece at a temperature T1, which is higher than the solubility temperature for carbide and/or nitride and lower t
A method for method for solution hardening of a cold deformed workpiece of a passive alloy containing at least 10% chromium, which method includes dissolving at least nitrogen in the workpiece at a temperature T1, which is higher than the solubility temperature for carbide and/or nitride and lower than the melting point of the passive alloy, wherein dissolution of nitrogen at temperature T1 is performed to obtain a diffusion depth in the range of 50 μm to 5 mm, and cooling the workpiece after the dissolution step at temperature T1 to a temperature which is lower than the temperature at which carbides and/or nitrides form in the passive alloy, wherein the cooling step takes place in an inert gas not containing nitrogen. Further, a member, such as a lock washer for securing bolts or nuts prepared using the method.
대표청구항▼
1. A method for solution treating a cold deformed workpiece of an alloy based on iron, nickel and/or cobalt and containing at least 10% chromium, the method comprising: dissolving at least nitrogen in the workpiece at a temperature T1, which is above 1020° C. and lower than the melting point of the
1. A method for solution treating a cold deformed workpiece of an alloy based on iron, nickel and/or cobalt and containing at least 10% chromium, the method comprising: dissolving at least nitrogen in the workpiece at a temperature T1, which is above 1020° C. and lower than the melting point of the alloy, wherein the dissolving of nitrogen at the temperature T1 is performed to obtain a diffusion depth in a range of 50 μm to 5 mm; andcooling the workpiece after the dissolving at the temperature T1 to a temperature which is below 550° C., wherein cooling from a temperature of 900° C. to a temperature of 700° C. is performed in less than 60 seconds, and wherein the cooling of the workpiece after the dissolving at the temperature T1 to the temperature which is below 550° C. takes place in an inert gas not containing nitrogen. 2. The method according to claim 1, further comprising a subsequent second step of dissolving nitrogen and/or carbon in the workpiece at a temperature T2 of at least 300° C. 3. The method according to claim 2, wherein the dissolving at the temperature T2 is performed in a process selected from a gas-based process, ion implantation, salt bath or plasma. 4. The method according to claim 2, wherein the dissolving at the temperature T1 and the dissolving at the temperature T2 are performed using a gas. 5. The method according to claim 2, wherein carbon is dissolved at the temperature T2, and the temperature T2 is in a range of 300 to 530° C. 6. The method according to claim 2, wherein nitrogen is dissolved at the temperature T2, and the temperature T2 is in a range of 300 to 500° C. 7. The method according to claim 2, wherein nitrogen and carbon are dissolved at the temperature T2, and the temperature T2 is in a range of 300 to 470° C. 8. The method according to claim 2, wherein a thickness of expanded austenite or expanded martensite of at least 5 μm is obtained in the workpiece. 9. The method according to claim 2, wherein a hardness of the expanded austenite zone or the expanded martensite zone is at least 1000 HV. 10. The method according to claim 2, wherein the dissolving at the temperature T2 takes place immediately after the cooling of the workpiece after the dissolving at the temperature T1, without occurrence of a passivation of the surface. 11. The method according to claim 1, wherein the inert gas is selected from helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), or radon (Rn), or any mixture of helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and/or radon (Rn). 12. The method according to claim 1, wherein the inert gas apart from unavoidable impurities is argon. 13. The method according to claim 1, wherein nitrogen and carbon are dissolved at temperature T1. 14. The method according to claim 1, wherein the alloy is austenitic stainless steel or ferritic-austenitic stainless steel. 15. The method according to claim 1, wherein the dissolving at the temperature T1 is performed using a gas containing nitrogen. 16. The method according to claim 1, wherein the temperature T1 is in a range of 1050° C. to 1300° C. 17. The method according to claim 1, wherein the workpiece is a lock washer of stainless steel for securing a fixing part. 18. The method according to claim to 17, wherein the lock washer has a first side with radial teeth and an opposite other side with cams. 19. The method according to claim 1, wherein the workpiece is: a part used in a valve; an outer surface area of a design object; a part of a bearing; a part of medical equipment; a part of dental equipment; a medical instrument; a dental instrument; a part of pharmaceutical equipment; or a part of a car. 20. A method of producing a corrosion resistant member, the corrosion resistant member being of an alloy based on iron, nickel and/or cobalt and comprising at least 10% chromium, the corrosion resistant member having a thickness of up to 10 mm, the method comprising the steps of: providing a cold deformed workpiece of an alloy based on iron, nickel and/or cobalt and comprising at least 10% chromium, the workpiece having a thickness of up to 10 mm;dissolving at least nitrogen in the workpiece at a temperature T1, which is above 1020° C. and lower than the melting point of the alloy, wherein the dissolving of nitrogen at the temperature T1 is performed to obtain a diffusion depth in a range of 50 μm to 5 mm; andcooling the workpiece after the dissolving at the temperature T1 to a temperature which is below 550° C., wherein cooling from a temperature of 900° C. to a temperature of 700° C. is performed in less than 60 seconds, and wherein cooling of the workpiece after the dissolving at the temperature T1 to the temperature which is below 550° C. takes place in an inert gas not containing nitrogen. 21. The method according to claim to 20, wherein the corrosion resistant member is a lock washer of stainless steel for securing a fixing part. 22. The method according to claim to 21, wherein the lock washer has a first side with radial teeth and an opposite other side with cams. 23. The method according to claim 20, wherein the workpiece or the corrosion resistant member is: a part used in a valve; an outer surface area of a design object; a part of a bearing; a part of medical equipment; a part of dental equipment; a medical instrument; a dental instrument; a part of pharmaceutical equipment; or a part of a car. 24. The method according to claim 20, wherein the alloy is selected from austenitic stainless steel or ferritic-austenitic stainless steel.
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이 특허에 인용된 특허 (1)
Berns Hans (Lwenzahnweg 11a 44797 Bochum DEX), Nitrogen enrichment of surface and near surface regions to produce a high-strength austenitic surface layer in stainless.
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