Al含量对高锰轻质钢组织和力学性能的影响  

Effect of Al content on microstructure and mechanical properties of high-Mn light-weight steels

作　　者：冯浩[1] 刘仁东 乔军[1] 郭金宇 徐荣杰 韩鹏[1] 周晏锋 

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]鞍钢集团钢铁研究院,辽宁鞍山114009

出　　处：《金属热处理》2016年第11期62-66,共5页Heat Treatment of Metals

摘　　要：以四种具有不同Al含量的Fe-19Mn-xAl-0.3Si-0.8C(x=3.5、6、8、11)热轧高锰轻质钢为研究对象,通过室温拉伸、XRD、金相检测和断口扫描等研究手段,研究Al元素对力学性能、显微组织、应变硬化行为以及断裂行为的影响。研究结果表明,随着Al含量的增加,铁素体含量增加、奥氏体晶粒尺寸减小、屈服强度和抗拉强度增加、伸长率和应变硬化能力下降,并呈现三个阶段的应变硬化特点。Al含量分别为3.5wt%、6wt%和8wt%时钢的断裂方式为韧性断裂,而Al含量为11wt%的钢呈韧性和准解理混合型断裂。Four hot rolled high-Mn light-weight steels of Fe-19Mn-xAl-0. 3Si-0. 8C（ x = 3. 5,6,8,11） with different Al contents were investigated. The effect of Al element on mechanical properties,microstructure,strain hardening behavior and fracture behavior was analyzed by means of room temperature tensile test,XRD,metallography observation and fracture scanning,etc. The results show that with the increase of Al content,ferrite content increases,grain size of austenite decreases,yield strength and tensile strength increase,ductility and strain hardening capacity decrease,and the steels exhibit three-stage strain hardening characteristics. The 3. 5Al,6Al,8Al steels exhibit ductile fractures and the 11 Al steel exhibits a mixed fracture of ductility and quasi-cleavage.

关 键 词：高锰轻质钢 显微组织 力学性能 应变硬化行为 断裂行为 

分 类 号：TG142[一般工业技术—材料科学与工程]