Abstract Electron beam layer solidification was used to prepare a nickel-based superalloy with refined microstructure and superior creep performance. It suggests that MC carbides could inherit from the solidification process, thus affect the performance of the alloy significantly. Microstructure analysis reveals that grain boundary microvoids and microcracks arised from slip and dislocation pile-ups are responsible for the creep fracture of the electron beam layer solidified alloy. The dislocation-precipitate interaction shows that cutting of a/2 partial dislocations and formation of APB are the decisive mechanisms for γ` phase, and for γ`` precipitates, shearing of a/2 doublets and a/6 partial dislocations act simultaneously.

中文翻译：

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电子束层凝固法制备镍基高温合金的中温蠕变和变形行为

摘要 采用电子束层凝固法制备了微观结构细化、蠕变性能优良的镍基高温合金。这表明MC碳化物可以从凝固过程中继承，从而显着影响合金的性能。显微组织分析表明，由滑移和位错堆积引起的晶界微孔洞和微裂纹是电子束层凝固合金蠕变断裂的原因。位错-沉淀相互作用表明a/2部分位错的切割和APB的形成是γ`相的决定性机制，对于γ`相，a/2双峰和a/6部分位错的剪切同时起作用。