BEHAVIOR AND MECHANISM OF HOT WORK-HARDENING FOR 316L STAINLESS STEEL

Acta Metall Sin

2010, Vol. 46

Issue (1): 57-61 DOI:

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BEHAVIOR AND MECHANISM OF HOT WORK-HARDENING FOR 316L STAINLESS STEEL

SONG Renbo¹⁾; XIANG Jianying¹⁾; HOU Dongpo¹⁾; REN Peidong²⁾

1 School of Materials Science and Engineering; University of Science and Technology Beijing; Beijing 100083 2 Technological Center of Jiuquan Iron $\&$ Steel Co. Ltd.; Jiayuguan 735100

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SONG Renbo XIANG Jianying HOU Dongpo REN Peidong. BEHAVIOR AND MECHANISM OF HOT WORK-HARDENING FOR 316L STAINLESS STEEL. Acta Metall Sin, 2010, 46(1): 57-61.

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Abstract

The characteristics of hot work-hardening for 316L stainless steel have been systematically studied through high temperature compression tests on the Gleeble-1500 thermal simulation testing machine. According to Ludwik true stress-strain model, the experimental data has been regressed by using nonlinear fitting method, and the $n$ value in Ludwik model, a comprehensive index which reflects the competitive result between work-hardening and softening, has been calculated with Crussard-Jaoul method. The dynamic recrystallization and twinning were observed by OM and TEM. The experiments reveal that 316L stainless steel is easy to work-hardening during hot deformation, and deformation rate can effect n^C-J-ε curves and variation law; There is no peak stress on its true stress-strain curves, but partial dynamic recrystallization has occurred during hot working process. This incomplete softening mechanism can't counteract the effect of hot work-hardening, so the true stress-strain curves still rise with deformation increasing; In addition, twinning occurred during hot working is one of the major mechanisms of hot work-hardening.

Key words: 316L stainless steel hot work-hardening Crussard-Jaoul analysis dynamic recrystallization twin

Received: 10 July 2009

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2010/V46/I1/57

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