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首页> 外文期刊>Metallurgical and Materials Transactions A >Microstructural Architecture, Microstructures, and Mechanical Properties for a Nickel-Base Superalloy Fabricated by Electron Beam Melting
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Microstructural Architecture, Microstructures, and Mechanical Properties for a Nickel-Base Superalloy Fabricated by Electron Beam Melting

机译：电子束熔化制备的镍基高温合金的组织结构，微观结构和力学性能

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摘要

Microstructures and a microstructural, columnar architecture as well as mechanical behavior of as-fabricated and processed INCONEL alloy 625 components produced by additive manufacturing using electron beam melting (EBM) of prealloyed precursor powder are examined in this study. As-fabricated and hot-isostatically pressed (“hipped”) [at 1393 K (1120 °C)] cylinders examined by optical metallography (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive (X-ray) spectrometry (EDS), and X-ray diffraction (XRD) exhibited an initial EBM-developed γ″ (bct) Ni3Nb precipitate platelet columnar architecture within columnar [200] textured γ (fcc) Ni-Cr grains aligned in the cylinder axis, parallel to the EBM build direction. Upon annealing at 1393 K (1120 °C) (hot-isostatic press (HIP)), these precipitate columns dissolve and the columnar, γ, grains recrystallized forming generally equiaxed grains (with coherent {111} annealing twins), containing NbCr2 laves precipitates. Microindentation hardnesses decreased from ~2.7 to ~2.2 GPa following hot-isostatic pressing (“hipping”), and the corresponding engineering (0.2 pct) offset yield stress decreased from 0.41 to 0.33 GPa, while the UTS increased from 0.75 to 0.77 GPa. However, the corresponding elongation increased from 44 to 69 pct for the hipped components.
机译：在这项研究中，研究了通过使用电子合金熔融（EBM）进行预合金化的前驱体粉末的增材制造而制造和加工的INCONEL 625合金组件的微观结构，微观结构，柱状结构以及机械性能。通过光学金相学（OM），扫描电子显微镜（SEM），透射电子显微镜（TEM），能量色散（在1393 K（1120°C）下制造的和热等静压（“倾斜”）气缸） X射线光谱法（EDS）和X射线衍射（XRD）展示了由EBM形成的初始γ''（bct）Ni 3 Nb沉淀血小板在柱状[200]织构化γ（ fcc）平行于EBM生成方向在圆柱轴上对齐的Ni-Cr晶粒。在1393 K（1120°C）（热等静压（HIP））上退火后，这些沉淀柱溶解，圆柱状γ晶粒重结晶，形成大体上等轴晶的晶粒（具有连贯的{111}退火孪晶），其中NbCr 2 Laves沉淀。在热等静压（“ hipping”）之后，微压痕硬度从〜2.7 GPa降低到〜2.2 GPa，相应的工程学（0.2 pct）偏移屈服应力从0.41降低到0.33 GPa，而UTS从0.75升高到0.77 GPa。然而，对应的伸长率从被打components的组件从44增加到69 pct。

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