Transactions of Materials and Heat Treatment

Title：Influence of work hardening at critical water temperature on driving force of stress corrosion crack growth for nuclear grade 316L stainless steel

Authors： Fan Yaling1 Yang Hongliang2

Unit： 1.School of Mechanical and Electrical Engineering Xi′an Railway Vocational & Technical Institute 2. Center of Engineering Training Xi′an University of Science and Technology

KeyWords： stress corrosion crack work hardening driving force of crack growth 316L stainless steel mechanical properties

ClassificationCode：TG174.3

year,vol(issue):pagenumber：2021,46(12):210-215

Abstract：

To understand the influence of work hardening for nuclear grade 316L stainless steel on the driving force of stress corrosion crack growth at nuclear power critical water temperature, the mechanical properties of 316L stainless steel in an environment at 500 ℃ were obtained by experiments. On this basis, with the aid of finite element numerical simulation method, the distribution laws of stress field at the tip of stress corrosion crack were analyzed, and the influence of work hardening on the driving force of crack growth was studied. The results show that the greater the tensile deformation is, the higher the yield strength, hardening index and degree of material work hardening degree for 316L stainless steel are. The greater the yield strength of 316L stainless steel is, the greater the crack tip stress and crack tip strain rate are and the greater the driving force of crack growth is. The larger the hardening index is, the smaller the crack tip stress, crack tip strain rate are, and the smaller the driving force of crack growth is. Both the crack tip stress and crack tip strain rate can reflect the changing laws of the driving force of crack growth, but the crack tip strain rate is more suitable for the quantitative calculation of crack growth rate.

Funds：

国家自然科学基金面上项目（52075434）；西安科技大学博士启动金（8150120009）

作者简介：樊亚玲（1981-），女，硕士，讲师 E-mail：yaling_fan@163.com 通信作者：杨宏亮（1981-），男，博士，工程师 E-mail：hl_yang@163.com

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