Mo-30W钼合金棒材再结晶行为研究

Study on recrystallization behavior of Mo-30W molybdenum alloy

采用粉末冶金工艺制备了Mo-30W钼合金棒材,通过拉伸力学性能测试、硬度测试、光学显微镜(optical microscope,OM)、扫描电子显微镜(scanning electron microscope,SEM)及能量色散谱仪(energy dispersive spectrometer,EDS)等测试分析手段,研究了Mo-30W钼合金棒材的再结晶行为。结果表明,由于W的固溶强化和变形强化,Mo-30W钼合金棒材在1600℃高温抗拉强度达到170MPa,延伸率为10%,高温力学性能得到明显提升;在1300～1500℃范围内,随着温度的升高,Mo-30W钼合金棒材强度和硬度先保持稳定然后显著下降;在1500℃时,Mo-30W钼合金棒材发生了完全再结晶,抗拉强度为385 MPa,维氏硬度为HV10 185,抗拉强度和硬度值达到最低。

Mo-30 W molybdenum alloy bar was prepared by powder metallurgy technology. The recrystallization behavior of Mo-30 W molybdenum alloy bar was analyzed by using tensile properties measurement, hardness measurement, optical microscope(OM), scanning electron microscope(SEM), and energy dispersive spectrometer(EDS). The results show that, the tensile strength of Mo-30 W molybdenum alloy bar at 1600 ℃ is 170 MPa and the elongation is 10% due to the solid solution strengthening and deformation strengthening of W, the high temperature mechanical properties are significantly improved. In the range of 1300～1500 ℃, the strength and hardness of Mo-30 W molybdenum alloy keep stable and then significantly decrease with the increase of temperature. The Mo-30 W molybdenum alloy are completely recrystallized at 1500 ℃, the tensile strength is 385 MPa, the Vickers hardness is HV10 185, and the tensile strength and hardness value reach the lowest.