CAJ | 학술논문

对初始晶粒度为6.5级的321奥氏体不锈钢进行不同温度及保温时间的热处理试验，利用金相显微镜观察并统计材料内部的晶粒演变趋势，建立材料的晶粒长大模型。利用Gleeble-3500热模拟实验机对321奥氏体不锈钢在不同变形温度和应变速率条件下进行等温热压缩实验，通过分析应力-应变曲线及再结晶晶粒尺寸建立材料的动态再结晶模型。再利用所建立的模型对实际生产锻件进行模拟，得出合理的锻造工艺。经检测，不锈钢锻件取样位置晶粒度为7级，与模拟结果一致，表明所建立微观组织模型能够准确预测321奥氏体不锈钢锻件实际生产过程中的晶粒演变过程。
대초시정립도위6.5급적321오씨체불수강진행불동온도급보온시간적열처리시험，이용금상현미경관찰병통계재료내부적정립연변추세，건립재료적정립장대모형。이용Gleeble-3500열모의실험궤대321오씨체불수강재불동변형온도화응변속솔조건하진행등온열압축실험，통과분석응력-응변곡선급재결정정립척촌건립재료적동태재결정모형。재이용소건립적모형대실제생산단건진행모의，득출합리적단조공예。경검측，불수강단건취양위치정립도위7급，여모의결과일치，표명소건립미관조직모형능구준학예측321오씨체불수강단건실제생산과정중적정립연변과정。
The 321 austenitic stainless steel with the initial grain size at level 6.5 is heat treated with different temperature and time. The grain growth model was proposed by the microstructure evolution investigation of the material. The flow behavior of the 321 stainless steel during hot deformation under different conditions is studied by Gleeble-3500 thermal mechanical simulator. Base on the experiment results, the dynamic recrystallization model of the material is determined. By using the models, the appropriate forging technique is determined. After the forging process, the grain size of the material at sampling point is level 7, which is the same as the simulated result. This indicates that the microstructure models established in the essay can well describe the microstructure evolution of the 321 austenitic stainless steel during the forging process.