Effects of Design Parameters on Thermal History and Mechanical Behavior of Additively Manufactured 17-4 PH Stainless Steel
Effects of Design Parameters on Thermal History and Mechanical Behavior of Additively Manufactured 17-4 PH Stainless Steel
复制标题
设计参数对增材制造17-4 PH不锈钢热历史和力学行为的影响
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
N. Shamsaei
中科院分区：
文献类型：
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作者：
R. Shrestha;P. D. Nezhadfar;M. Masoomi;J. Simsiriwong;Nam Pha;N. Shamsaei
在这项研究中，研究了单调拉伸和应变控制疲劳载荷下零件尺寸对增材制造 17-4 PH 不锈钢的热历史和机械性能的影响。两组样本由方棒和超大样本加工而成，这些样本是使用激光床粉末熔融 (L-PBF) 工艺制造的，以引入样本几何形状的变化，从而引入热历史的变化。单调拉伸试验在0.001 s-1 的应变速率下进行。在 0.003 和 0.0035 mm/mm 下进行完全反转 (Rε = -1) 应变控制疲劳测试，并改变测试频率以在所有测试中保持恒定的平均应变率。实验结果表明，样品几何形状对 L-PBF 17-4 PH SS 拉伸性能的影响极小，而且还发现其与锻造材料相当。另一方面，观察到样本几何形状对疲劳行为的一些影响。与由超大样本加工而成的样本相比，由方杆加工而成的样本表现出略高的抗疲劳性。此外，热模拟表明，与方棒加工的样品相比，由超大尺寸样品加工的样品具有更高的整体加热，这表明零件几何形状对制造零件经历的热历史的影响。
In this study, the effects of part size on thermal history and mechanical properties of additively manufactured 17-4 PH stainless steel were investigated under monotonic tensile and strain-controlled fatigue loadings. Two sets of specimens were machined from square rods and oversized specimens, which were fabricated using a laser bed powder fusion (L-PBF) process, to introduce variation in specimen geometry and consequently thermal history. Monotonic tensile tests were conducted at a strain rate of 0.001 s-1. Fully-reversed (Rε = -1), strain-controlled fatigue tests were performed at 0.003 and 0.0035 mm/mm, and varying test frequency to maintain a constant average strain rate in all tests. Experimental results indicated minimal effect of specimen geometry on the tensile properties of L-PBF 17-4 PH SS, which were also found to be comparable to the wrought material. On the other hand, some influence of specimen geometry on fatigue behavior was observed. Specimens machined from square rods exhibited slightly higher fatigue resistance as compared to specimens machined from oversized specimens. Furthermore, thermal simulations demonstrated higher bulk heating in specimens machined from oversized specimens as compared to those from square rods, which indicated the effect of part geometry on thermal history experienced by the fabricated part.
影响因子：
6
作者：
Yadollahi, Aref;Shamsaei, Nima
通讯作者：
Shamsaei, Nima