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设计了一组不同成分的低镍铬锰氮奥氏体不锈钢,通过热轧、退火、冷轧及Gleeble热模拟,观察研究了实验钢在不同状态下的显微组织、力学性能及高温热变形行为的变化规律。结果表明:热轧后实验钢的强度随固溶温度的提高而降低,塑性随固溶温度的提高而增大,实验条件下的最佳固溶温度为1050℃;冷加工变形量的增大能显著提高显微组织中形变马氏体的含量,增大实验钢的强度、硬度和屈强比,降低断后伸长率,且在实验范围内抗拉强度与维氏硬度在数值上呈现近似3倍的关系。热加工过程中实验钢的易裂敏感区间约为750~950℃,最佳热加工区间为1000~1200℃。
A series of austenitic low Ni, Cr, Mn and Ni stainless steels with different compositions were designed. The microstructure, mechanical properties and high temperature hot deformation of experimental steels under different conditions were observed and studied by hot rolling, annealing, cold rolling and Gleeble thermal simulation Behavior changes. The results show that the strength of the experimental steel decreases with the increase of the solution temperature and the plasticity increases with the increase of the solution temperature. The optimum solution temperature is 1050 ℃ under the experimental conditions. Significantly increase the content of deformed martensite in the microstructure, increase the strength, hardness and yield ratio of the experimental steel and reduce the elongation at break, and in the experimental range the tensile strength and the Vickers hardness are numerically approximate 3 Times the relationship. In the hot working process, the easy-crack sensitive range of the experimental steel is about 750-950 ℃, and the best thermal processing range is 1000-1200 ℃.