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通过调整热变形和热处理工艺参数,对含氮0.52%的Cr-Mn-Mo-N高氮奥氏体不锈钢的组织与力学性能的关系进行了系统研究。研究结果表明,高氮奥氏体不锈钢中析出氮化物对塑性的损害高于残留铁素体的作用,热变形组织对材料的强化作用高于残留铁素体。在1000～1050℃温度范围内终轧并水冷至室温的高氮不锈钢的组织为单一奥氏体,且强韧性能优异。通过采用合理的热变形工艺,可以不经后续热处理直接轧制出与固溶态相比,屈服强度、抗拉强度和加工硬化速率更高,屈强比更低且延伸率基本不变的高氮奥氏体不锈钢。
The relationship between the microstructure and mechanical properties of 0.52% Cr-Mn-Mo-N high-nitrogen austenitic stainless steel with nitrogen content was systematically investigated by adjusting the parameters of thermal deformation and heat treatment. The results show that the precipitation of nitrides in high-nitrogen austenitic stainless steel is more detrimental to the plasticity than the residual ferrite, and the hot-deformed microstructure has a higher strengthening effect on the material than the residual ferrite. The structure of high-nitrogen stainless steel, which is finish rolled and cooled to room temperature in the temperature range of 1000 ~ 1050 ℃, is single austenite and has excellent toughness. By using a reasonable thermal deformation process, high yield strength, tensile strength and work hardening rates, lower yield ratios, and substantially constant elongation can be rolled without subsequent heat treatment compared to solid solution Nitrogen austenitic stainless steel.