摘要
采用光学显微镜、透射电子显微镜、拉伸试验机等手段,研究了Al元素含量对淬回火态4Cr5MoVSi模具钢微观组织、物相、硬度、拉伸和冲击性能的影响。结果表明,Al含量为0~0.6%(质量分数,下同)的淬回火态4Cr5MoVSi模具钢的组织为马氏体,Al含量为1.2%~1.8%的淬回火态4Cr5MoVSi模具钢的组织为马氏体外+δ铁素体。未添加Al和添加0.3%~1.8%Al的淬回火态4Cr5MoVSi模具钢的物相主要为α-Fe和M_(7)C_(3)相。Al含量为0.3%~1.2%的淬火态、淬回火态4Cr5MoVSi模具钢的硬度变化幅度较小,当Al元素含量增加至1.8%时,淬火态和淬回火态模具钢的硬度显著减小。加入适量的Al元素有助于提升淬回火态4Cr5MoVSi模具钢的室温抗拉强度、断后伸长率和冲击韧性,添加1.2%Al元素的淬回火态4Cr5MoVSi模具钢具有较高的硬度、抗拉强度和冲击韧性。
Influence of Al content on the microstructure,phases,hardness,tensile and impact properties of quenched and tempered 4Cr5MoVSi die steel was studied by using optical microscopy,transmission electron microscopy(TEM),tensile testing machine among other instruments.It is found martensite is formed in the quenched and tempered 4Cr5MoVSi die steel with Al content of 0-0.6%(mass fraction,the same below),while martensite plusδferrite are formed in the quenched and tempered 4Cr5MoVSi die steel with Al content of 1.2%-1.8%.Without adding Al or with an addition of 0.3%-1.8%Al,4Cr5MoVSi die steel after quench and tempering hasα-Fe and M_(7)C_(3) formed as its main phases.The 4Cr5MoVSi die steel with an Al content of 0.3%-1.2%has its relatively small variation in its hardness after quenching and tempering;however,with Al content up to 1.8%,the quenched and tempered die steel has its hardness significantly reduced.It is concluded that an appropriate addition of Al is beneficial to improvement in the room-temperature tensile strength,elongation at break,and impact toughness of quenched and tempered 4Cr5MoVSi die steel;with an addition of 1.2%Al,the quenched and tempered 4Cr5MoVSi die steel can have higher hardness,strength,and impact toughness.
作者
刘校培
徐慧
李攀
陈秋莉
魏政顺
郭晓光
卢志安
LIU Xiaopei;XU Hui;LI Pan;CHEN Qiuli;WEI Zhengshun;GUO Xiaoguang;LU Zhi’an(Henan Mechanical and Electrical Vocational College,Zhengzhou 451191,Henan,China;Henan Vocational and Technical College,Zhengzhou 450046,Henan,China;Zhengzhou University,Zhengzhou 450001,Henan,China)
出处
《矿冶工程》
北大核心
2025年第5期181-185,共5页
Mining and Metallurgical Engineering
基金
河南省科技攻关项目(22102310255)。
