Indentation Plastometry for Study of Anisotropy and Inhomogeneity in Maraging Steel Produced by Laser Powder Bed Fusion
Indentation Plastometry for Study of Anisotropy and Inhomogeneity in Maraging Steel Produced by Laser Powder Bed Fusion
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压痕塑性测定法研究激光粉末床熔融马氏体时效钢的各向异性和不均匀性
DOI：
10.1002/srin.202200881
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发表时间：
2023
影响因子：
2.2
通讯作者：
Southern T
中科院分区：
文献类型：
--
作者：
Southern T
这项工作涉及使用基于轮廓术的压痕塑性仪(PIP)来获得通过添加制造路线(激光粉床熔化)生产的马氏体时效钢样的力学性能信息。钢筋的生产有两种配置：“水平”(所有材料都靠近建板)和“垂直”(逐渐增加离建板的距离)。样品在竣工和老化条件下都进行了机械测试。将单轴试验(拉伸和压缩)的应力-应变曲线与PIP试验的应力应变曲线进行了比较。拉伸测试数据表明存在明显的各向异性，水平方向比垂直方向更硬。然而，系统的压缩试验表明，这些材料中任何地方都不存在各向异性，这些试验允许在不同位置获得建筑和横向的曲线。这与电子背散射衍射结果一致，表明这些材料中没有明显的织构。这与PIP测试的结果也是一致的，PIP测试可以高灵敏度地检测各向异性。此外，PIP试验和压缩试验结果都表明，在离建筑板不同距离处变化的生长条件会导致强度变化。似乎以前被解释为拉伸响应中的各向异性的情况实际上是由于这种类型的不均质性造成的。
This work concerns the use of profilometry‐based indentation plastometry (PIP) to obtain mechanical property information for maraging steel samples produced via an additive manufacturing route (laser powder bed fusion). Bars are produced in both “horizontal” (all material close to the build plate) and “vertical” (progressively increasing distance from the build plate) configurations. Samples are mechanically tested in both as‐built and age‐hardened conditions. Stress–strain curves from uniaxial testing (tensile and compressive) are compared with those from PIP testing. Tensile test data suggest significant anisotropy, with the horizontal direction harder than the vertical direction. However, systematic compressive tests, allowing curves to be obtained for both build and transverse directions in various locations, indicate that there is no anisotropy anywhere in these materials. This is consistent with electron backscattered diffraction results, indicating that there is no significant texture in these materials. It is also consistent with the outcomes of PIP testing, which can detect anisotropy with high sensitivity. Furthermore, both PIP testing and compression testing results indicate that the changing growth conditions at different distances from the build plate can lead to strength variations. It seems likely that what has previously been interpreted as anisotropy in the tensile response is in fact due to inhomogeneity of this type.