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首页> 外文期刊>Journal of Phase Equilibria and Diffusion >Microstructural Development in As Built and Heat Treated IN625 Component Additively Manufactured by Laser Powder Bed Fusion
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Microstructural Development in As Built and Heat Treated IN625 Component Additively Manufactured by Laser Powder Bed Fusion

机译：通过激光粉床融合造成含量加热的微观结构及散热处理

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摘要

The RL10 engine program is exploring the use of IN625 Ni-base superalloy components that are additively manufactured using laser powder bed fusion (LPBF). IN625 alloy powders are commercially available for LPBF to produce dense, complex parts/components. In this study, IN625 components, with both simple and complex geometries with overhangs, were manufactured via LPBF, and subjected to a heat-treatment consisting of a stress relief, hot isostatic pressing (HIP), and a solution anneal. The microstructure was examined with optical, scanning electron, and transmission electron microscopy. Changes in phase constituents and microstructure were documented as a function of heat treatment and component geometry (i.e., bulk section built on support structure versus thin, overhang section built on top of the previous powder bed). The as-built microstructural features included large columnar grains, a sub-grain cellular-solidification structure, approximately similar to 1 mu m in diameter, and solute enriched cell boundaries decorated with A(2)B Laves phases. After heat treatment, the bulk section consisted of recrystallized equiaxed grains with annealing twins, and the sub-grain cellular-solidification structure was found to be completely dissolved. However, in the thin, overhang section, the sub-grain cellular-solidification structure persisted within columnar grain structure, which exhibited no recrystallization. An alternate HIP cycle with a higher temperature was employed to produce desired microstructure (i.e., recrystallized grains without sub-grain cells and Laves phases) in components with geometrical complexity for successful testing of RL10 engine.
机译：RL10发动机项目正在探索使用IN625镍基高温合金部件，这些部件是使用激光粉末床熔合（LPBF）额外制造的。IN625合金粉末可用于LPBF生产致密、复杂的零件/组件。在本研究中，通过LPBF制造了具有简单和复杂外伸几何形状的IN625组件，并进行了包括应力消除、热等静压（HIP）和固溶退火的热处理。用光学显微镜、扫描电子显微镜和透射电子显微镜检查了其微观结构。记录了相成分和微观结构的变化，作为热处理和部件几何形状的函数（即，支撑结构上的大块部分与之前粉末床顶部的薄型悬垂部分）。建成后的微观结构特征包括大柱状晶粒、直径约为1μm的亚晶粒胞状凝固结构，以及用a（2）B Laves相装饰的溶质富集胞体边界。经热处理后，大块截面由再结晶等轴晶和退火孪晶组成，亚晶胞状凝固组织完全溶解。然而，在较薄的外伸部分，亚晶粒胞状凝固组织仍存在于柱状晶粒结构中，未表现出再结晶。为了成功测试RL10发动机，采用具有较高温度的交替热等静压循环，在具有几何复杂性的部件中产生所需的微观结构（即无亚晶细胞和Laves相的再结晶晶粒）。

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