摘要
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 continuous cooling transformation behavior of 12%Cr ultra-super-critical rotor steel was studied.The CCT curves of 12%Cr were determined.The different quenching process was established for the high and low pressure turbine.The different quenching process was simulated by numerical simulation method.The distributions of temperature and stress were gotten through the simulation.The microstructure of different locations in the rotor was analyzed.The microstructure is obviously different between the low and high voltage terminal after differential quenching processes.The location and time of the largest quenching stress was determined and the three-directional stress state was analyzed,the effective stress is 357 MPa at this place.
出处
《热加工工艺》
CSCD
北大核心
2010年第24期224-227,共4页
Hot Working Technology
基金
"十一五"科技支撑计划重点项目(2007BAF02B04)
关键词
超超临界转子
分区热处理
数值模拟
相变
应力状态
ultra-super-critical rotor
heat treatment
numerical simulation
phase transformation
stress state
