铸造冷作Cr5Mo1V模具钢的合金化与组织性能  

Alloying and Properties of As-cast Cold Work Cr5Mo1V Die Steel

作　　者：冯贵层[1] 张敬尧[2] Feng Guiceng;Zhang Jingyao(Wuhan Technical College of Communications;School of Mechanical Engineering,Yangzhou University)

机构地区：[1]武汉交通职业学院智能制造学院,武汉430065 [2]扬州大学机械工程学院

出　　处：《特种铸造及有色合金》2022年第2期200-204,共5页Special Casting & Nonferrous Alloys

基　　金：湖北省技术创新专项重大资助项目(2019AA016);湖北省教育科学“十三五”规划课题资助项目(2016GB278)。

摘　　要：采用X射线衍射仪、光学显微镜、扫描电镜和透射电镜等手段,研究了Al含量对Cr5Mo1V模具钢显微组织和力学性能的影响,并分析了Al的作用机理。结果表明,铸态Cr5Mo1V-xAl模具钢的主要物相为α-Fe、γ-Fe和M;C;型碳化物,且随着Al含量增加,模具钢中珠光体面积分数先增大后减小,当Al质量分数增至1.2%时,开始出现δ-Fe相。未添加Al的回火态Cr5Mo1V模具钢中可见板条马氏体和次生碳化物;在Al含量为1.2%和1.5%时,可见局部细小孪晶和粗大碳化物。随着回火态Cr5Mo1V-xAl模具钢中Al含量从0增至1.5%,模具钢的抗拉强度、伸长率、冲击韧度和硬度呈现先增加后减小的特征,适宜的Al含量为1.2%,这主要与此时模具钢中形成了纳米孪晶、较多的次生碳化物和弥散分布的δ-Fe相有关。The effects of Al content on the microstructure and mechanical properties of Cr5 Mo1 V die steel were investigated by means of optical microscope, scanning electron microscope, transmission electron microscope and X-ray diffractometer, and the action mechanism of Al element was analyzed. The results indicate that the main phases of as-cast Cr5 Mo1 V-xAl die steel are composed of α-Fe, γ-Fe and M;C;carbide, and the area fraction of pearlite in the die steel is firstly increased and then decreased with the increase of Al content. As the Al content increases to 1.2%, the pearlite appears in the die steel. Lath martensite and secondary carbide can be observed in tempered Cr5 Mo1 V die steel without Al addition. When Al content is 1.2% or 1.5%, local fine twins and coarse carbides are generated. With the increase of Al content in tempered Cr5 Mo1 V-xAl die steel from 0 to 1.5%, the tensile strength, elongation, impact toughness and hardness of die steel are firstly increased and then decreased with the appropriate Al content of 1.2%, which is mainly attributed to the formation of nano twins, major secondary carbides and dispersed distribution of δ-Fe phase in die steel.

关 键 词：Cr5Mo1V模具钢 AL含量 回火态 显微组织 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程]