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对超超临界转子钢12%Cr过冷奥氏体转变规律进行了研究。测量了12%Cr过冷奥氏体连续冷却转变动力学曲线。根据CCT曲线制定了材质为12%Cr的高低压联合转子分区热处理工艺。通过有限元方法对该工艺进行了数值模拟。模拟了转子高压端与低压端不同截面位置处的温度场、应力场。对淬火后转子不同位置处的组织转变特点进行了分析。通过分区热处理,在转子高压测和低压侧获得了具有明显差异的组织。确定了淬火过程中最大淬火应力出现的位置和时间,分析了该处三向应力状态的变化,该处等效应力为357 MPa。
The supercooled rotor steel 12% Cr undercooled austenite transformation was studied. The kinetic curves of 12% Cr undercooled austenite continuous cooling transformation were measured. Based on the CCT curve, a high and low pressure combined rotor zone heat treatment process with 12% Cr material was developed. The process was numerically simulated by finite element method. The temperature field and stress field at different cross-sections of the rotor at high pressure and low pressure are simulated. After quenching the rotor at different locations at the organizational transformation characteristics were analyzed. By zonal heat treatment, significantly different microstructures were obtained on the high pressure and low pressure sides of the rotor. The location and time of the maximum quenching stress in quenching process were determined. The change of three-way stress state was analyzed, where the equivalent stress was 357 MPa.