北京科技大学学报Issue(8)：1032-1038,7.DOI:10.13374/j.issn1001-053x.2014.08.007
铁素体和珠光体含量影响变形过程的原位研究
In situ studies on the effect of ferrite and pearlite contents on the deformation process
摘要
Abstract
In situ tensile tests in a scanning electron microscope ( SEM) were carried out using single-edge notched specimens for two types of steels:a pure high-strength steel ( HSS) composed mainly of ferrite and a small amount of pearlite, and a wheel steel composed mainly of pearlite and a small amount of proeutectoid ferrite. Regardless of the specimen thickness meeting the plane strain condition or not, the process of deformation and cracking for the pure HSS starts at ferrite slip, then continuously propagates and finally results in ductile fracture;the small amount of pearlite has nearly no impact on the overall deformation process;and the fracture surface is composed of dimples. However, for the wheel steel, when the specimen thickness is thin, which means that it does not meet the plane strain condition, plastic deformation occurs firstly in proeutectoid ferrite, even though its amount is very small, and then microc-racks initiate and grow along the interface of proeutectoid ferrite and the pearlite colony, and finally evolves into discontinuous microc-racks. The fracture surface fractograph presents both dimple and quasi-cleavage characteristics. For a wheel steel specimen with the thickness meeting plane strain condition, plastic deformation and cracking mainly occurs in the pearlite colony, which results in cleav-age fracture.关键词
高强钢/车轮钢/铁素体/珠光体/原位拉伸/塑性变形Key words
high-strength steel ( HSS)/wheel steel/ferrite/pearlite/in-situ tensile testing/plastic deformation分类
矿业与冶金引用本文复制引用
段桂花,张平,李金许,宿彦京,乔利杰..铁素体和珠光体含量影响变形过程的原位研究[J].北京科技大学学报,2014,(8):1032-1038,7.基金项目
“油气藏地质及开发工程”国家重点实验室(西南石油大学)资助项目(PLN1204) （西南石油大学）
国家自然科学基金资助项目(51171024) （51171024）
