Effect of Work Hardening on Mechanical Properties of Stress Corrosion Crack Tip of 304 Stainless Steel
ZHANG Jianlong1,2, XUE He1, CUI Yinghao1, CHEN Hao1
1 College of Mechanical Engineering, Xi’an University of Science and Technology, Xi’an 710054 2 Xi’an Special Equipment Inspection Institute, Xi’an 710065
Abstract: Stress corrosion cracking (SCC) is one of the main failure mode of austenitic steel in pressure piping, and cold working deformation has a certain influence on the material mechanical properties and the crack propagation. Firstly, the constitutive parameters of 304 stainless steel under different cold working hardening conditions were obtained by fatigue stretching machine, and then finite element simulation method was adopted to establish the SCC crack tip analysis model and sub-model in this paper. The SCC crack tip stress strain, J-integration and crack growth rate of 304 austenitic stainless steel were studied under different work hardening. Results show that with the increasing of the material work har-dening degree, the Mises stress and J integral at the SCC tip increase gradually, but the crack tip strain (PEEQ) gradually decreases. To some extent, the work hardening promotes and accelerates the stress corrosion cracking of 304 stainless steel.
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2019, Vol. 33 
