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以机电一体化设备材料304奥氏体不锈钢为研究对象,对其在不同热处理下的微观组织和力学性能进行研究。结果表明:不锈钢为单相奥氏体组织,基材晶粒粗大且其大小长短极其不均匀;经过冷轧处理,其微观组织晶粒大小很不均匀,分布紊乱;700℃保温5h退火处理,晶粒大小略微均匀;800℃时效2h,晶粒大小比较细小、均匀;随着温度升高,铁素体相质量分数下降,奥氏体相质量分数逐渐升高;随退火温度升高和时效时间延长,不锈钢显微硬度和抗拉强度逐渐降低,适量缩短固溶时间可以提高不锈钢的力学性能。
The 304 austenitic stainless steel, a mechatronic equipment material, was taken as the research object, and its microstructure and mechanical properties under different heat treatments were studied. The results show that the stainless steel is a single phase austenite, the grains of the stainless steel are coarse and the length and the length of the stainless steel are extremely uneven. The microstructure of the stainless steel is very heterogeneous in grain size and disarranged after cold rolling. The steel is annealed at 700 ℃ for 5h, The grain size is slightly uniform; 800 ℃ aging 2h, the grain size is small and uniform; as the temperature increases, the ferrite phase mass fraction decreases, the austenite phase mass fraction gradually increased; with the annealing temperature and aging As the time prolongs, the microhardness and tensile strength of stainless steel decrease gradually, and shortening the solution time can improve the mechanical properties of stainless steel.