Apparent Morphologies and Structures of Martensite in Ultrahigh Carbon Steel

摘要：

Research was done on morphologies and structures of martensite developed in ultrahigh carbon steel containing 1.6 wt pet carbon. It was shown that large changes in microstructure with the austenitizing temperature existed for the quenched steel. A coarse twin martensite was resulted by austenitizing at high temperature. In contrast, a structure consisting of submicron lath, jujube-stone like martensite and some fine twin martensite, as well as undissolved cementite was done at lower austenitizing temperature. Morphologic studies of the jujube-stone like martensite revealed a jujube-stone like three-dimension form, and high resolution electron microscopy (HREM) revealed a sub-structure of high-density dislocations. It is considered that the dissolution of carbide particles lags behind the ferrite to austenite transformation when the steel is being austenitized. Dislocation pile-ups form at the original positions where carbide particles dissolved. During the quenching, martensite nucleates at dislocation pile-ups, and grow and thicken through a mechanism of dislocations moving. And finally the lath martensite or jujube-stone like martensite form.

关键词： ultrahigh carbon steel martensitic transformation high resolution electron microscopy dislocation

作者: ZHANG Zhan-ling LIU Yong-ning ZHANG Ke-ke SUN Jun-jie XIA Qi GAO Li-hua

作者单位: School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 47100 State Key Laboratory for Mechanical Behavior of Materials,Xian Jiaotong University,Xian 710049,Peo

会议类型: 国际会议

会议名称: The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)

会议地点: 北京

会议语种:英文

页码: 152-155

在线出版日期: 2009-10-27（万方平台首次上网日期，不代表论文的发表时间）