The effect of thermo-mechanical process history on microstructure development and stress corrosion cracking behavior of solution annealed Type 304 stainless steel has been investigated. Metallographic screening and electron backscatter diffraction analysis has been carried out to characterize microstructure after thermo-mechanical processing treatments. The application of cold reductions between 5% and 20%, followed by solution annealing treatments, resulted in different microstructure characteristics. Mixed-mode trans-/intergranular stress corrosion fractures were observed, and heat treatment at 950 °C resulted in changes of failure mode to predominantly transgranular. Fractographic assessment of the different themo-mechanical process conditions revealed a relationship between Grain Size (ASTM GS), Grain Boundary Character Distribution (GBCD), and Time to Failure (t_f).

已经研究了热机械加工过程对固溶退火 304 型不锈钢的微观结构发展和应力腐蚀开裂行为的影响。已经进行了金相筛选和电子背散射衍射分析来表征热机械加工处理后的微观结构。应用 5% 到 20% 之间的冷轧，然后进行固溶退火处理，导致不同的微观结构特征。观察到混合模式的跨/晶间应力腐蚀断裂，950°C 的热处理导致失效模式转变为主要是跨晶。不同热机械工艺条件的断口评估揭示了晶粒尺寸 (ASTM GS)、晶粒边界特征分布 (GBCD)、_f )。