纯钼、TZM和MHC合金棒材性能对比研究

Comparative Study of the Properties of Pure Molybdenum,TZM and MHC Alloy Bars

采用粉末冶金工艺制备了纯钼、TZM和MHC合金棒材,通过拉伸力学性能测试、硬度测试、金相分析、电镜分析等手段对材料的显微组织、硬度、室温和1000℃高温力学性能进行了对比研究。结果表明:纯钼、TZM和MHC钼合金室温下抗拉强度分别为710、788、843 MPa,1000℃高温抗拉强度分别为223、423、499 MPa,钼合金的主要强化方式是固溶强化以及第二相碳化物TiC、ZrC和HfC强化。由于第二相碳化物HfC较TiC、ZrC熔点高、晶粒细小,因此MHC钼合金综合性能更为优异。

Pure molybdenum,TZM and MHC molybdenum alloy rods were prepared by powder metallurgy process,and the microstructure,hardness,room temperature and 1000℃high temperature mechanical properties of the materials were comparatively investigated by means of tensile mechanical property test,hardness test,metallographic analysis and electron microscope analysis.The results show that the tensile strengths of pure molybdenum,TZM and MHC molybdenum alloys at room temperature are 710 MPa,788MPa and 843 MPa,respectively,and the high temperature tensile strengths at 1000℃are 223 MPa,423 MPa and 499 MPa,respectively,and that the main reinforcement of molybdenum alloys is solid solution strengthening as well as strengthening by the second phase carbides TiC,ZrC and HfC.MHC molybdenum alloys have superior overall performance due to the higher melting point and finer grain size of the second-phase carbide,HfC,compared to TiC and ZrC.Pure molybdenum,TZM and MHC alloy rods were prepared by powder metallurgy process,and the microstructure,hardness,room temperature and 1000℃high temperature mechanical properties of the materials were comparatively investigated by means of tensile mechanical property test,hardness test,metallographic analysis and electron microscope analysis.The results show that the tensile strengths of pure molybdenum,TZM and MHC alloys at room temperature are 710 MPa,788 MPa and 843 MPa,respectively.The high temperature tensile strengths at 1000℃are 223 MPa,423 MPa and 499MPa,respectively.The main reinforcement of molybdenum alloys is solid solution strengthening as well as strengthening by the second phase carbides TiC,ZrC and HfC.MHC molybdenum alloys have superior overall performance due to the higher melting point and finer grain size of the second-phase carbide,HfC,compared to TiC and ZrC.