Effects of in-process LN2 cooling on the microstructure and mechanical properties of type 316L stainless steel produced by wire arc directed energy deposition
Effects of in-process LN2 cooling on the microstructure and mechanical properties of type 316L stainless steel produced by wire arc directed energy deposition
复制标题
液氮在线冷却对电弧定向能量沉积316L不锈钢显微组织和力学性能的影响
DOI：
10.1016/j.matlet.2020.128707
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发表时间：
2021
影响因子：
3
通讯作者：
Cunningham C
中科院分区：
文献类型：
--
作者：
Cunningham C
首次研究了电弧定向能沉积过程中低温冷却对316L型不锈钢显微组织和力学性能的影响。过程中的低温冷却是用位于焊枪后面的液氮低温射流进行的，目标是沉积过程中熔池后面的材料。与在160°C的调节通道间温度下进行的Wire Arc DED相比，在ln2冷却的过程中，沉积层的晶粒取向更加随机，产生了大量的等轴晶。对于使用过程低温冷却生产的样品，拉伸测试的平均杨氏模量为163±51 GPa。这与使用通道间温度控制产生的样品相比显着更高，后者的平均温度为72±27 GPa。BS EN 10088-1 316L型指南规定杨氏模量为200gpa。在这项研究中，通过过程冷却来提高刚度，这对于建筑和核工业中结构应用的Wire Arc DED部件的增材制造来说是一个重要的发现。
For the first time, in-process cryogenic cooling for Wire Arc Directed Energy Deposition (DED) and its influence on the microstructure and mechanical properties of Type 316L stainless steel is investigated. The in-process cryogenic cooling is applied with a liquid nitrogen cryogenic jet positioned behind the welding torch, targeting the material directly behind the melt pool during deposition. Compared with Wire Arc DED that is conducted with a regulated interpass temperature of 160 °C, the crystallographic grain orientations of the deposit with in-process LN2cooling were found to be significantly more random, with high numbers of equiaxed grains generated. For the samples produced using in-process cryogenic cooling, the tensile tests resulted in a mean Young’s Modulus of 163 ± 51 GPa. This is significantly higher compared with samples produced using interpass temperature control which resulted in a mean of 72 ± 27 GPa. BS EN 10088-1 guidance for Type 316L specifies a Young’s Modulus of 200 GPa. The stiffness improvement with in-process cooling demonstrated in this research is a significant finding for the additive manufacture of parts by Wire Arc DED for structural applications in the architectural and nuclear industries.
DOI：
10.1016/j.jmatprotec.2013.04.012
发表时间：
2013-10-01
影响因子：
6.3
作者：
Colegrove, Paul A.;Coules, Harry E.;Cozzolino, Luis D.
通讯作者：
Cozzolino, Luis D.