Hot Isostatic Pressing (HIP) Model Developments for P/M Alloy 690N{sub 2}

Sears, J.W. ; Xu, J.

Lockheed Martin Corporation

关键词: Alloys;    Interstitials;    Precipitation Hardening;    36 Materials Science;    Nitrogen;   

DOI  :  10.2172/821685
RP-ID  :  LM-01K081
RP-ID  :  AC12-00SN39357
RP-ID  :  821685

美国|英语

来源: UNT Digital Library

【 摘 要 】

Powder Metallurgy (P/M) Alloy 690N{sub 2}, the P/M derivative of Inconel 690 (IN 690), has been shown to have a higher elevated temperature yield strength and superior stress corrosion cracking (SCC) resistance than IN 690. The property improvements seen in P/M Alloy 690N{sub 2} are due to interstitial nitrogen strengthening and precipitation hardening resulting from the formation of fine titanium/chromium--carbo-nitrides. The application of P/M Alloy 690N{sub 2} has had limited use, because of the high costs involved in producing wrought products from powder. Hot Isostatic Pressing (HIP) modeling to produce near net shapes should provide a more economical route for exploiting the benefits of Alloy 690N{sub 2}. The efforts involved in developing and verifying the P/M Alloy 690N{sub 2} HIP model are disclosed. Key to the deployment of HIP modeling is the development of the method to fabricate HIP powder containers via laser powder deposition.