摘要
采用SEM、TEM、LF457型激光导热仪,DSC404型差示扫描量热仪和UMT-3型高温摩擦磨损试验机对高强钢板热冲压用新型模具钢的组织和热稳定性能、热物理性能及高温耐磨性能进行研究。试验结果表明:该模具钢具有良好的抗回火软化性能、热稳定性、高热导率和高温耐磨性,能更好地适应高强钢板热冲压工况。新型模具钢的碳化物以Mo2C和VC为主,使得该钢有更好的抗回火软化和热稳定性。新型钢具有高热导率,在室温下是H13钢的1.4倍。其低Si、Mn、Cr和高Mo的合金化特征是其高热导率的原因。该钢较H13钢有更好的高温耐磨性能,尤其是温度高于600℃后耐磨性要远远优于H13钢。新型模具钢良好的耐磨性能有益于减少模具修理频次,提高模具寿命。
Microstructure,thermo stability,thermal physical property and high temperature wear resistance of a new die steel for hot stamping of high strength steel were investigated by means of scanning electron microscope(SEM),transmission electron microscope(TEM),LF457 type laser flash thermal analyzer,DSC404 type differential scanning calorimeter and UMT-3 high temperature wear test system.The results show that the new hot stamping die steel has excellent resistance to tempering,thermo stability,thermal conductivity and high temperature wear resistance and better adapt to the working condition of high strength steel hot stamping process.There are mainly Mo2 C and VC type carbides in the steel,these carbides ensure the steel with high resistance to tempering and thermo stability.The steel has high thermal conductivity,which is 1.4 times of H13 steel at room temperature.The low Si,Mn,Cr and high Mo alloying can be the reason for the high thermal conductivity of the steel.The new die steel has better high temperature wear resistance than that of H13 steel,especially when temperature is above 600℃,which can decrease the repair frequency and improve service life of the hot stamping die.
作者
李爽
高云飞
王辰
王真
石永亮
吴晓春
Li Shuang;Gao Yunfei;Wang Chen;Wang Zhen;Shi Yongliang;Wu Xiaochun(Hebei Collage of Industry and Technology,Shijiazhuang Hebei 050091,China;School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第9期178-185,共8页
Heat Treatment of Metals
基金
河北工业职业技术学院博士基金(BZ201801)
河北省教育厅青年基金(QN2020257)。
关键词
热冲压模具钢
热稳定性
热导率
高温耐磨性
hot stamping die steel
thermal stability
thermal conductivity
high temperature wear resistance
