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Effects of heat treatment on microstructure and creep properties of a laser powder bed fused nickel superalloy

机译：热处理对激光粉末床熔凝镍高温合金组织和蠕变性能的影响

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Nickel-based superalloy C263 has been consolidated with Laser Powder Bed Fusion (LPBF) with two perpendicular build orientations and exposed to either of two heat treatment programmes. This study analyses the effects of build orientation and heat treatment on the resulting microstructures produced in LPBF C263 variants, evaluated against a cast equivalent. Results show that although a strongly anisotropic microstructure was present in standard heat-treated (HT1) LPBF material, this was eradicated following an alternate heat treatment regime (HT2) through recrystallisation, aided by high local strain. Subsequently, their mechanical properties have been assessed by means of the Small Punch (SP) creep test. A contrasting presence of Sigma 3 formations was observed between the two LPBF heat treatment programmes with the resulting random grain boundary network (RGBN) revealing shorter potential intergranular crack paths in the HT2 material, although grain boundary carbides were found to be the dominant strengthening mechanism for improved creep resistance. Adapted Wilshire equations have been implemented to predict the long-term creep lives of the C263 variants and their apparent activation energies have been determined. (C) 2018 The Authors. Published by Elsevier Ltd.
机译：镍基超级合金C263已与激光粉末床熔合（LPBF）进行了整合，具有两个垂直的构建​​方向，并且可以通过两种热处理程序之一进行暴露。这项研究分析了铸件定向和热处理对LPBF C263变体中产生的最终微结构的影响。结果表明，尽管在标准热处理（HT1）LPBF材料中存在强各向异性的微观结构，但在替代热处理方案（HT2）之后，由于高局部应变，该材料通过重结晶而被消除。随后，已通过小冲孔（SP）蠕变测试评估了它们的机械性能。在两个LPBF热处理程序之间观察到了Sigma 3形成物的对比存在，所得的随机晶界网络（RGBN）揭示了HT2材料中潜在的晶间裂纹路径更短，尽管发现晶界碳化物是HT2材料的主要强化机制。改善的抗蠕变性。已实施改编的Wilshire方程来预测C263变体的长期蠕变寿命，并确定了它们的表观活化能。 （C）2018作者。由Elsevier Ltd.发布

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