淬火态马氏体向珠光体转变的研究  

Study of Transformation of As-quenched Martensite to Pearlite

作　　者：胡冠杰 平德海 殷匠 HU Guanjie;PING Dehai;YIN Jiang(School of Chemical Engineering,Zhengzhou University,Zhengzhou 450001,Henan China;Shanghai Bainite Chain Material Technology Co.,Ltd.,Shanghai 200439,China)

机构地区：[1]郑州大学化工学院,河南郑州450001 [2]上海茵矩材料科技有限公司,上海200439

出　　处：《热处理》2022年第5期7-13,共7页Heat Treatment

摘　　要：采用透射和扫描电子显微镜对碳钢中珠光体组织的亚结构进行了深入研究。结果表明:碳钢珠光体存在一个自身演变过程。与传统的通过C原子自由扩散的形核和生长机制不同,片层状珠光体可以由孪晶马氏体低温回火形成。由于淬火态孪晶马氏体中存在孪晶界面相,孪晶马氏体(α-Fe/ω-Fe_(3)C/α-Fe)具有微细片层状珠光体这样的特征。采用电子显微镜观察表明:淬火态马氏体中α-Fe和ω-Fe_(3)C相均极为细小,回火时发生再结晶和粗化,并且ω-Fe_(3)C相向θ-Fe_(3)C转变以及孪晶关系消失,导致形成稳定的珠光体组织。The substructure in pearlite structure was investigated in depth by means of transmission electron microscope(TEM) and scanning electron microscope(SEM). The results show that the pearlite in carbin steel has a own evolution process. Unlike the traditional nucleation and grain growth via the free diffusion of carbon atoms, the laminar pearlite can be formed via the transformation of twinned martensite during low-temperature tempering. Due to the presence of twinning boundary phase in the as-quenched twinned martensite, the twinned martensite(α-Fe/ω-Fe_(3)C/α-Fe) exhibits as characteristic as fine laminar pearlite. From observation by transmission electron microscope it is showed that both α-Fe and ω-Fe_(3)C phases in the as-quenched martensite are ultra-fine, and recrystallize and coarsen during the tempering, as well as the ω-Fe_(3)C phase transforms into θ-Fe_(3)C, and the twinning relationship disappears, thus resulting in the formation of a stable pearlite structure.

关 键 词：马氏体 珠光体 渗碳体 电子显微镜 微观组织 

分 类 号：TG113.1[金属学及工艺—物理冶金]