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本文主要借助扫描电镜PSEM-500研究了粉末Ti-6Al-4V合金过早疲劳断裂的问题。结果表明:尽管所有过早疲劳断裂样的裂源区显示出解理或准解理脆性,但材料的最终断裂特征仍然显示出延性本质。引起过早疲劳断裂的主要原因是粉末制备和处理过程中混入的杂质元素,例如Fe,Si,Ca等。间隙元素氢对过早疲劳断裂也有影响。试样中的残余孔隙和另一种钛合金粉末粒子对过早疲劳断裂无有害影响。
In this paper, the problem of premature fatigue fracture of powder Ti-6Al-4V alloy has been studied by scanning electron microscope PSEM-500. The results show that although all premature fatigue fracture-like source regions show cleavage or quasi-cleavage brittleness, the ultimate fracture characteristics of the material still show ductile properties. The main cause of premature fatigue fracture is the incorporation of impurity elements such as Fe, Si, Ca, etc. during powder preparation and handling. Gap element hydrogen also has an effect on premature fatigue failure. The residual porosity in the sample and another titanium alloy powder particle have no detrimental effect on premature fatigue failure.