利用压痕塑性测量法获得增材制造的小型高温合金部件的应力-应变曲线

Yuanbo T. Tang, J. Campbell, M. Burley, J. Dean, R. Reed, T. Clyne
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引用次数: 2

摘要

本调查涉及通过增材制造程序生产的高温合金样品。显微结构检查证实,它们表现出柱状晶粒结构,晶粒在生长(“构建”)方向上拉长,并表现出与该轴平行的强烈纹理。样品沿着构建和横向进行拉伸测试,发现后者既硬又硬。仅通过压痕塑性测量新技术获得的相应图(包括使用球形压痕器测量压痕的轮廓并从中提取应力-应变关系)被发现与这些直接测量的曲线完全一致。此外,研究表明,完整的三维特征可以用来获得至少半定量的表征塑性各向异性的性质和强度。这是一项技术的重大进步,可能对机械测试程序产生变革性影响。
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Use of Indentation Plastometry to Obtain Stress-Strain Curves from Small Superalloy Components Made by Additive Manufacturing
This investigation concerns superalloy samples that were produced by an additive manufacturing procedure. Microstructural examination confirmed that they exhibited a columnar grain structure, with the grains elongated in the growth (“build”) direction and exhibiting a strong texture involving alignment of parallel to this axis. Samples were tensile tested along both build and transverse directions, being found to be both stiffer and harder in the latter. Corresponding plots obtained solely via the novel technique of Indentation Plastometry (involving measurement of the profiles of indents created using a spherical indenter and extraction from these of the stress-strain relationship) were found to be entirely consistent with these directly-measured curves. Furthermore, it is shown that full 3-D characterization of the indent profiles can be used to obtain at least a semi-quantitative indication of the nature and strength of the plastic anisotropy. This constitutes a significant advance in the context of a technique that could have a transformative effect on mechanical testing procedures.
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