Abstract The intercrystalline precipitation behavior and mechanical properties of 204C2 nickel-saving austenitic stainless steel (NSAs) sensitized for 15 min at 500–800 °C after solid solution treatment was investigated. The experimental results show that with the increase of sensitization temperature, the intercrystalline precipitate underwent four stages of change: point-shaped at 500 °C → discontinuous points at 600 °C → chain shape at 700 °C →growth into the grain at 800 °C. Combined with the results of the tensile test at room temperature, the specimens were sensitized at 600 °C and 700 °C, their tensile strength and yield strength both decreased, but their elongation was almost the same. The occurrence of this phenomenon indicating that compared with the discontinuous point precipitates, the chain precipitates caused less lattice distortion in the surrounding matrix and required less energy to produce the same deformation.

中文翻译：

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敏化诱导晶间析出对204C2节镍奥氏体不锈钢力学性能的影响

摘要 研究了 204C2 节镍奥氏体不锈钢 (NSA) 在 500–800 °C 下固溶处理 15 min 后的晶间析出行为和力学性能。实验结果表明，随着敏化温度的升高，晶间析出物经历了四个阶段的变化：500℃点状→600℃不连续点→700℃链状→800℃生长成晶粒C。结合室温拉伸试验结果，试样在600℃和700℃敏化，其拉伸强度和屈服强度均有所下降，但伸长率几乎相同。这种现象的发生说明与不连续点析出相比较，