用中途淬火法,双磨面金相法以及电子探针半定量微区碳成份分析对14SiMn3V钢粒状贝茵体转变进行了研究。发现14SiMn3V钢粒状贝茵体铁素体块是经由贝茵体铁素体条柱长大熔合形成的;在粒状贝茵体转变之前,过冷奥氏体内存在碳成份的偏聚;在铁素体条柱长大过程中γ/α相界处有碳的堆集,不能满足块型转变所需的新旧相之间的成份不变条件,认为粒状贝茵体不是块型转变的产物。 The transformation of granular granular bainite in 14SiMn3V steel was studied by mid-quenching method, double grinding surface metallography and semi-quantitative micro-area carbon analysis of the electron probe. It was found that the granular bainitic ferrite blocks of 14SiMn3V steel were formed by the growth and fusion of bainitic ferrite bars. Prior to the transformation of granular bainite, segregation of carbon components existed in the undercooled austenite. The accumulation of carbon in the γ / α phase boundary during the growth of the bulk rod can not meet the compositional invariance conditions between the old and the new phases required for bulk transformation. It is believed that the granular bainite is not the product of bulk transformation.