Transactions of Materials and Heat Treatment

Title：Influence of strain rate and stress triaxiality on strength of steel 316LN

Authors： Duan Xingwang Liu Jiansheng

Unit： Taiyuan University of Science and Technology

KeyWords： steel 316LN thermal tensile test yield strength tensile strength stress triaxiality strain rate

ClassificationCode：TG316

year,vol(issue):pagenumber：2017,42(11):172-176

Abstract：

To obtain the influence of strain rate and stress triaxiality on strength of steel 316LN, the thermal tensile tests of steel 316LN were conducted by Gleeble-1500D thermal simulator at 1050 ℃. For the smooth specimens, the strain rates were set as 0.005, 0.05, 0.5 and 1 s-1 respectively. However, for the notched specimens, the strain rate was set as 0.5 s-1, and the notch-radius were set as 0.5, 1, 2 and 4 mm respectively. The results show that with the increase of strain rate and stress triaxiality, the yield strength and tensile strength increase, and the yield-tensile ratio decreases. Thus, the crack is hard to produce. Furthermore, the models between strength index and strain rates, stress triaxialities were established by regression analysis respectively. At last, the sensitivity analysis shows that with the increase of strain rate and the decrease of stress triaxiality，the influences of strain rate and stress triaxiality on strength decrease.

Funds：

山西省自然科学基金资助项目（2014011015-5）；太原科技大学博士启动基金项目（20142010）

作者简介：段兴旺（1973-），男，博士，副教授 E-mail：dxwmike1998@sina.com

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