论文部分内容阅读
研究了300 M钢在不同加热温度(850～1180℃)和保温时间(5～120 min)下的奥氏体晶粒长大规律。绘制了300 M钢奥氏体晶粒尺寸在不同加热温度和保温时间下的等值线图;利用Sellars晶粒长大模型,构建了300 M钢的奥氏体晶粒长大数学模型。结果表明,300 M钢在高温加热时具有较好的抗晶粒粗化能力,在1050℃左右开始粗化。奥氏体晶粒尺寸等值线图可定性和定量预测奥氏体晶粒长大规律;奥氏体晶粒长大数学模型可用两个数学公式来描述,即当加热温度为850℃≤T≤1050℃时,d6.14=texp(68.97-64945.88/T);当加热温度为1050℃≤T≤1180℃时,d7.39=texp(134.56-144504.52/T)。
The rule of austenite grain growth of 300 M steel was studied under different heating temperatures (850 ~ 1180 ℃) and holding time (5 ~ 120 min). The contour diagram of the austenite grain size of 300 M steel was drawn under different heating temperature and holding time. The mathematical model of austenite grain growth of 300 M steel was constructed by using the Sellars grain growth model. The results show that 300 M steel has good resistance to grain coarsening when heated at high temperature, and begins to coarsen at about 1050 ℃. Austenite grain size contour map qualitative and quantitative prediction of austenite grain growth rule; austenite grain growth mathematical model can be described by two mathematical formulas, that is, when the heating temperature is 850 ℃ ≤ T D6.14 = texp (68.97-64945.88 / T) when it is less than or equal to 1050 ℃, and d7.39 = texp (134.56-144504.52 / T) when the heating temperature is 1050 ℃ ≤T≤1180 ℃.