衬板用铸态Fe-24Mn-7Al-1C耐磨钢的应变硬化行为研究  

Research on Strain Hardening Behavior of Light-weight Fe-24Mn-7Al-1C Cast Wear Resistant Steel for Lining Plates

作　　者：彭世广[1] 宋仁伯[1] 谭志东[1] 王忠红[2] 郭客[2,3] 高景俊[4] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]鞍钢集团矿业设计研究院,鞍山114004 [3]辽宁科技大学化学工程学院,鞍山117022 [4]鞍钢集团矿业公司,鞍山114031

出　　处：《机械工程学报》2016年第8期125-132,共8页Journal of Mechanical Engineering

摘　　要：对衬板用新型铸态轻质Fe-24Mn-7Al-1C耐磨钢进行准静态条件下不同变形量的压缩试验,分析应变硬化行为,揭示出该铸态耐磨钢的加工硬化机理。根据压缩应力-应变曲线和对数真应力-对数真应变曲线分析压缩变形特征;并利用光学显微镜、X射线衍射和透射电镜研究不同应变量的变形后的微观组织形貌。研究结果表明,试验钢在屈服阶段的加工硬化曲表现出双加工硬化指数行为;在透射电子显微镜和X射线衍射分析时既未发现形变诱发马氏体存在,也没有发现位错胞和形变孪晶,变形后仍为奥氏体单相组织;在不同变形量变形后的奥氏体显微组织中依次可以观察到位错堆积(1%)、高密度位错墙(5%)、泰勒晶格(10%)、具有高密度位错的畴界(20%)和微带(50%),说明轻质Fe-24Mn-7Al-C耐磨钢钢微观变形机理是平面滑移机制。The novel of light-weight Fe-24Mn-7Al-1C cast wear-resistant steel for lining plates is compressed at the condition of quasi static and different deformation, strain hardening behavior during plastic deformation is analyzed, meanwhile, the work hardening mechanism of cast wear resistant steel is revealed. Based on the stress-strain curve and corresponding logarithmic true stress-logarithmic strain curve, the characteristic of compression deformation is researched. The microstructure of the novel steel before and after different deformation are further analyzed with the help of optical microscope （OM）, X-ray diffraction （XRD） and transmission electron microscopy（TEM）. The research results indicate that yield stage of strain hardening curve shows double work hardening index behavior. The transmission TEM and XRD analysis of deformation neitherεmartensite nor mechanical twins are found, no cell formation is observed either,phase but austenite is found in the X ray diffraction analysis. In different deformation austenite after deformation in place, in turn, substructural developments are manifested by the dislocation pile ups（1% pre-strain）, high density dislocation walls（5% pre-strain）, Taylor lattice（10% pre-strain）, Domain boundaries（20% pre-strain） and microbands（50% pre-strain） with high density of dislocations. So that the light-weight Fe-24Mn-7Al-C wear-resistant steel microscopic deformation mechanism is planar slip.

关 键 词：衬板 轻质 Fe-24Mn-7Al-C钢 耐磨钢 微带 微观变形机理 

分 类 号：TG142[一般工业技术—材料科学与工程]