ECAP道次对Q235钢拉伸性能及位错强化的影响  

Effects of ECAP Passes on Tensile Properties and Dislocation Strengthening of Q235 Steel

作　　者：王子路[1] 许晓静[1] 陆文俊[1] 卢予东[1] 郭云飞[1] 马文海[1] 

机构地区：[1]江苏大学先进制造与现代装备技术工程研究院,江苏镇江212013

出　　处：《热加工工艺》2014年第23期1-5,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51074079)

摘　　要：研究了ECAP道次对Q235钢拉伸性能与位错强化的影响。结果表明,ECAP加工明显提高了钢的强度,尤其是抗拉强度,但强度并非是随着ECAP道次的增加而增加。基于XRD分析和Taylor公式的定量计算,研究了ECAP提高强度的机理。结果说明,结构细化提高的强度小于位错密度增加提高的强度,后者对强度提供的贡献至少占到50%。The effects of ECAP passes on tensile properties and dislocation strengthening of Q235 steel were studied. The results show that ECAP processing significantly improves the strength of the steel, especially yield strength. But the strength does not increase as ECAP passes increase, and the intensity peak appears in the first pass. The mechanism of increasing the strength with ECAP was studied based on the XRD analysis and quantitative calculations of Taylor formula. The research results explain that the strength increased by structure refinement is smaller than that caused by the increasing of dislocation density. And the later one contributes at least 50% in strength.

关 键 词：Q235钢 ECAP加工 拉伸性能 

分 类 号：TG376[金属学及工艺—金属压力加工] TG142.1[一般工业技术—材料科学与工程]