研究了Rene95粉末高温合金原始颗粒边界(PPB)析出相的形貌和分布状态,及其对As—HIP合金力学性能、断口形貌和微观断裂特性的影响,原始颗粒边界密集分布的析出相质点会导致颗粒间结合界面的脆化,降低塑性,断裂沿颗粒的球面进行增大析出质点的间距,可改善合金的界面结合强度,提高HIP合金的高温塑性、持久寿命,断裂变为穿颗粒进行
Nature of prior pacticle boundary precipitation of P/M superalloy Rene 95and its effects on mechanical properties, fracture morphology and micro-fracture characteris-tics are discussed. The precipitates of densely distributed prior particle boundary mayembrittle the bonding boundaries among particles, reduce the plasticity and fracture alongtheir globular surfaces. An improvement on interfacial bonding strength, plasticity at hightemperature, as well as stress rupture life of the alloy may be made by broadening theinterstices between precipitated particles. Thus, the fracture mode is changed fromintergranular to transgranular.
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