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本文对汽轮机末级叶片钢2Cr13粗晶马氏体在重新加热淬火后的粗晶遗传现象进行了研究,观察了在奥氏体化时恒温形成的动力学和组织结构。讨论了在相变区的加热速度、奥氏体化温度及保温时间对奥氏体晶粒的影响。研究表明,调质后粗晶奥氏体的遗传现象,是由于沿原奥氏体晶界碳化物偏聚析出的结果。还讨论了奥氏体晶粒度对调质后力学性能的影响,扫描及透射电镜观察结果表明,调质后的力学性能,主要取决于钢中碳化物的分布及尺寸。
In this paper, the coarse grain martensite of the final turbine blade steel 2Cr13 after reheating and quenching was studied. The kinetics and microstructure of the as-quenched austenite were observed. The effects of heating rate, austenitizing temperature and holding time on austenite grain size in the phase transition zone are discussed. The research shows that the genetic phenomenon of austenite after quenched and tempered is due to segregation of carbides along the original austenite grain boundaries. The effects of austenite grain size on mechanical properties after quenching and tempering were also discussed. Scanning and transmission electron microscopy observations show that the mechanical properties after quenching are mainly determined by the distribution and size of carbides in the steel.