2008, Vol. 44

Issue (7): 775-780 DOI:

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北京交通大学

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. . Acta Metall Sin, 2008, 44(7): 775-780 .

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Abstract Deformation and strain-hardening behaviors and strain induced martensite transformation were investigated for both commercial cold rolled 301L stainless steels, in both HT(high tensile) and LT(low tensile) work hardening grad condition at present work. Plastic strain stretching to failure at room temperature induced over 85% volume percent of martensite at all of tested steels. The higher cold rolled strain of steels, the smaller strain at which martensite transformation onset during stretching, but it didn’t increase the saturate volume fraction of martensite. Different carbon and nitrogen content lead to different deformation and strain-hardening behaviors in the same cold rolling hardened grade 301Ls. Higher carbon and nitrogen content made cold rolled steels obtain required high yield strength but with less α'-martensite, and inhere with better plasticity and plastic processing capability; Cold rolled 301L also got higher strain-hardening rate and flow stress due to α'–martensite with more carbon and nitrogen in solution. α'-Martensite transformation was deferred and elongated to higher tensile strain because of more carbon and nitrogen in austenite, enhanced TRIP of 301L cold rolled steels.

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Received: 22 October 2007

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2008/V44/I7/775

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