DEVELOPMENT OF HIGH STRENGTH ALLOYS BY CRYOGENIC STRETCH-FORMING.
Final rept. Part I,
ARDE-PORTLAND INC PARAMUS N J
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The basis for the work conducted is the property of austenitic stainless steels to strengthen by transforming to a low carbon martensite when subjected to cold work at cryogenic temperatures. In addition, an ageing treatment at 800F after cryogenic cold working results in a further increase in strength. A series of experimental heats were prepared and evaluated for their response to stretching at -320F as well as subsequent ageing at 800F. It was demonstrated that the highest strength levels could be achieved when the 301 was alloyed with hardener elements. For example, with alloys containing Cb and Al, uniaxial strength levels of 350,000 psi were obtained.