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首页> 外文期刊>Materials Science and Engineering >In situ tensile study of PM-HIP and wrought 316 L stainless steel and Inconel 625 alloys with high energy diffraction microscopy
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In situ tensile study of PM-HIP and wrought 316 L stainless steel and Inconel 625 alloys with high energy diffraction microscopy

机译：利用高能衍射显微镜对PM-HIP和锻制316 L不锈钢以及Inconel 625合金进行原位拉伸研究

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摘要

High-Energy Diffraction Microscopy (HEDM) was employed to measure and compare the evolving micromechanical state of two alloys, an austenitic stainless steel (316 L) and nickel-based alloy (Inconel 625) fabricated by both conventional methods and powder metallurgy with hot isostatic pressing (PM-HIP) during in situ uniaxial tensile testing. Each of the four materials was tested through the elastic regime to just beyond yield. HEDM was performed at room temperature in the far-field (ff) configuration at the Cornell High Energy Synchrotron Source to measure grain-average elastic strains and subsequently derive stress tensors. The evolution of the normal stress component along the loading direction in individual grains as a function of macroscopic deformation is presented. Initially, grain-scale stresses in the loading direction are more heterogeneous in the wrought alloys than in the PM-HIP alloys. Notably, many peripheral grains in the wrought specimens are near yield even before load is applied. With increased loading, grain-scale stresses tend to homogenize in all specimens. Orientation fields measured using electron back scatter diffraction (EBSD) are used to determine grain morphologies and interpret the ff-HEDM data. The PM-HIP grains tend to be finer and rounder in shape than the wrought grains, potentially explaining the grain-scale stress distributions. Finally, yield strength and modulus of elasticity are measured for the four alloys and correlated to the resultant grain size and morphology from the fabrication processes.
机译：采用高能衍射显微镜（HEDM）来测量和比较两种合金的演变微观力学状态，这两种合金是通过常规方法以及热等静压粉末冶金法制造的奥氏体不锈钢（316 L）和镍基合金（Inconel 625）在原位单轴拉伸测试中按（PM-HIP）。四种材料中的每一种都通过弹性方式进行了测试，刚好超过屈服强度。 HEDM在室温下以康奈尔高能同步加速器源的远场（ff）配置进行，以测量晶粒平均弹性应变并随后得出应力张量。给出了在单个晶粒中沿着加载方向的法向应力分量随宏观变形的变化。最初，在锻造合金中，在加载方向上的晶粒尺寸应力比在PM-HIP合金中更加不均匀。值得注意的是，即使在施加载荷之前，变形试样中的许多外围晶粒也接近屈服。随着载荷的增加，晶粒度应力在所有试样中趋于均匀。使用电子背散射衍射（EBSD）测量的取向场可用于确定晶粒形态并解释ff-HEDM数据。 PM-HIP晶粒的形状往往比变形晶粒更细，更圆，这可能解释了晶粒尺寸应力分布。最后，测量了四种合金的屈服强度和弹性模量，并将其与制造过程中得到的晶粒尺寸和形态相关。

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