Tensile tests with notched specimens at slow displacement rate were carried out to investigate the susceptibility to aging temperature on delayed fracture tendency of maraging stainless steels. The results indicate that the under-aged specimens treated at 420 and 440℃ suffer delayed cracking by hydrogen, although the mass fractions of hydrogen in the whole specimens which were made by nomal smelting and working are below 2×10-6. While the tensile strength and fracture behaviour of notched specimens aged above 460℃ at slower displacement rate (0. 0015mm/min) are similar to that at faster displacement rate (0. 15mm/min), i. e. these specimens are relatively insensitive to delayed fracture.
Key words
maraging stainless steels /
delayed cracking by hydrogen /
aging temperature /
notched tensile strength
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References
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Footnotes
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