超超临界转子钢X12CrMoWVNbN10-1-1的等温转变动力学  

Isothermal transformation kinetics of X12CrMoWVNbN10-1-1 steel for the ultra-supercritical rotor

作　　者：韩利战[1] 顾剑锋[1] 潘健生[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海市激光制造与材料改性重点实验室,上海200240

出　　处：《材料热处理学报》2010年第1期35-39,共5页Transactions of Materials and Heat Treatment

基　　金：上海市科学技术委员会重大科技攻关项目(08DZ1100302)

摘　　要：通过膨胀试验测定了X12CrMoWVNbN10-1-1铁素体耐热钢连续加热过程相变动力学曲线(CHT),根据等温转变动力学与连续转变动力学之间的关系将CHT曲线转换为等温加热相变动力学曲线(IHT);采用定量金相法测定X12CrMoWVNbN10-1-1铁素体耐热钢以30℃/h加热至1070℃保温12h的过冷奥氏体经过不同温度等温转变的转变量与等温时间的关系,根据试验结果求解出修正的Avrami方程中的系数,并绘制出这种奥氏体化条件下的过冷奥氏体等温转变动力学曲线(TTT)。The isothermal transformation kinetics curves of X12CrMoWVNbN10-1-1 ferritic heat-resistant steel were investigated.The continuous heating transformation curve（CHT） tested by dilatometric experiment is converted to isothermal heating phase transformation curve（IHT） based on the relationship between isothermal transformation kinetics and continuous transformation kinetics.The transformed volume fraction of ferrite to austenite in the steel after austenization at 1070 ℃ for 12 h is measured as a function of isothermal time at different isothermal temperatures by quantitative metallographic method.The coefficients of modified Avrami equation are obtained and TTT curve of the steel is developed based on the experiments.

关 键 词：超超临界转子钢 等温相变动力学曲线 Avrami方程 

分 类 号：TG151.3[金属学及工艺—热处理]