Study on Stress Corrosion Behavior of Domestic Forged 316L Stainless Steel in High Temperature and High Pressure Water Environment

doi:10.3901/JME.2018.10.053

Abstract

Abstract: In high temperature and high pressure water of a simulated primary circuit of PWR environment, the stress corrosion cracking behavior of forged 316L stainless steel under different strain is investigated by means of slow strain rate testing (SSRT). And the fracture morphology of specimens is analyzed with the aid of scanning electron microscopy.The results show that the stress corrosion cracking(SCC) susceptibility of 316L stainless steel increases with the decrease of SSRT rate in the 290℃ high temperature water. At the strain rate of 2×10^-5 s^-1, no obvious cleavage character is found on the fracture surfaces. At the strain rate of 2×10^-6 s^-1, the material shows the clear tendency of brittle fracture characteristics both at the 290℃ and 320℃,while the susceptibility increases slightly with temperature. At the strain rate of 1×10^-6 s^-1, the edge fracture morphology of the specimen presents brittle fracture characteristics. The modified Arrhenius model is used to describe the high temperature and high pressure tension constitutive equation of 316 stainless steel. By calculation, the activation energy Q is about 213.7 kJ/mol, then the high temperature tensile constitutive equation is obtained. The ultimate stress values predicted by proposed model has a low value of relative error(0.45%). So this constitutive equation is some accurate to get the ultimate stress of forged 316L stainless steel in high temperature and pressure water.

Key words: constitutive equation, forged 316L stainless steel, high temperature and high pressure water, slow strain rate, stress corrosion

CLC Number:

TG172

XU Lianyong, WANG Hao, ZHAO Lei, JING Hongyang, HAN Yongdian. Study on Stress Corrosion Behavior of Domestic Forged 316L Stainless Steel in High Temperature and High Pressure Water Environment[J]. Journal of Mechanical Engineering, 2018, 54(10): 53-58.

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