An investigation of the plastic work to heat conversion of wrought and laser powder bed fusion manufactured Inconel 718
An investigation of the plastic work to heat conversion of wrought and laser powder bed fusion manufactured Inconel 718
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DOI：
10.1016/j.addma.2021.102179
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发表时间：
2021-10
影响因子：
11
通讯作者：
J. Varga;O. Kingstedt
中科院分区：
文献类型：
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作者：
J. Varga;O. Kingstedt
在这项研究中，研究了Inconel 718（IN 718）的塑性功转换为热量，也称为泰勒-昆尼系数（β）。检查三种材料条件，特别是锻造IN 718和激光粉末床熔合（LPBF制造的IN 718在竣工条件下，并已通过固溶热处理再结晶。绝热变形条件是使用张力分裂霍普金森压杆。在变形过程中进行红外热成像测量，以便可以确定每种材料条件下塑性功到热量的转换，作为应变的函数。使用电子背散射衍射进行微观结构表征，以测量晶粒尺寸、形态和织构。从所进行的实验中观察到，锻造IN 718具有最低的塑性功到热的转化率（β = 0.2）。完工LPBF IN 718的塑性功热转换率略高（β = 0.3），重结晶条件下的塑性功热转换率最高（β = 0.45）。所观察到的订购的塑性功的热转换效率进行了讨论，在光的微观结构的相似性和差异，每种材料的条件。发现晶粒尺寸的增加与β的减小相关。
In this study, the conversion of plastic work to heat, also known as the Taylor-Quinney coefficient (β), of Inconel 718 (IN718) is investigated. Three material conditions are examined, specifically wrought IN718 and laser powder bed fusion (LPBF manufactured IN718 in the as-built condition and one that has been recrystallized through a solutionizing heat treatment. Adiabatic deformation conditions are achieved using a tension split-Hopkinson pressure bar. Infra-red thermography measurements are made during deformation such that the conversion of plastic work to heat can be determined for each material condition as a function of strain. Microstructure characterization was conducted using electron backscatter diffraction to measure grain size, morphology, and texture. From the experiments conducted, it was observed that wrought IN718 had the lowest conversion of plastic work to heat (β≈ 0.2). The as-built LPBF IN718 had a slightly higher conversion of plastic work to heat (β≈ 0.3), and the recrystallized condition had the greatest plastic work to heat conversion (β≈ 0.45). The observed ordering of the plastic work to heat conversion efficiency is discussed in light of the microstructural similarities and differences of each material condition. Increasing grain size was found to be correlated with a decrease inβ.