Investigation of Stress Corrosion Cracking Initiation in Machined 304 Austenitic Stainless Steel in Magnesium Chloride Environment
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The effect of the machining-induced residual stresses and microstructural changes on the stress corrosion cracking (SCC) initiation in 304 austenitic stainless steel was investigated. The residual stress was measured with an x-ray diffractometer, and the microstructural changes were characterized by the electron backscatter diffraction. Through a load-free testing in the boiling magnesium chloride solution, the subsurface zone of high SCC sensitivity was identified by detecting the depth of the micro-cracks. The development of the SCC micro-crack was related to the machining-induced residual stresses and microstructural changes. The results showed that the SCC micro-crack was prone to propagate in the subsurface where the residual stress was larger than 200 MPa, along with high-density grain boundary. Additionally, the SCC micro-crack initiation was observed to develop along the machining-induced slip bands.
Keywordsaustenitic stainless steel machining microstructural changes residual stress stress corrosion cracking
This work is supported by the National Natural Science Foundation of China (Grant No. 51875219, 51375182). The authors thank Analytical and Testing Center of HUST for FSEM and TEM measurements and Advanced Manufacturing and Technology Experiment Center of School of Mechanical Science and Engineering of HUST for residual stress measurements.
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