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本文利用性能检验、相分析、X光衍射、光学金相显微镜、扫描和透射电子显微镜、俄歇谱仪等手段,借助统计分析的方法对铁镍基沉淀强化高温合金GH150 800℃时效以后μ相与合金拉伸塑性之间的关系进行了仔细研究。结果表明:800℃时效后晶界μ相显著降低合金的室温拉伸塑性,室温延伸率与晶界μ相粒子的密集系数存在直线关系;时效状态的样品室温拉伸变形时,裂纹起始于μ相粒子周围,并沿着晶界方向扩展,断裂发生在μ相与基体的界面处;μ相不影响合金的700℃拉伸塑性.因为在此温度下μ相已具有塑性,参与基体一起变形。
In this paper, by means of performance test, phase analysis, X-ray diffraction, optical microscope, scanning and transmission electron microscopy, Auger spectroscopy and other means, with statistical analysis of the iron-nickel base precipitation hardening superalloy GH150 800 ℃ aging And the relationship between the tensile plasticity of the alloy has been carefully studied. The results show that the grain boundary μ phase remarkably reduces the room temperature tensile ductility of the alloy at 800 ℃, and there is a linear relationship between the elongation at room temperature and the density coefficient of the grain boundary μ phase. At room temperature, The μ phase does not affect the tensile ductility of the alloy at 700 ℃ because the μ phase has plasticity at this temperature and participates in the matrix together Deformation.