Microstructure of the Nickel-Base Superalloy CMSX-4 Fabricated by Selective Electron Beam Melting

被引：0
|
作者：
Markus Ramsperger
Robert F. Singer
Carolin Körner
机构：
[1] University of Erlangen-Nuremberg,Department of Materials Science, Chair of Metals Science and Technology
来源：
Metallurgical and Materials Transactions A | 2016年 / 47卷
关键词：
Additive Manufacturing; Crack Density; Interdendritic Region; Dendrite Core; Liquid Metal Cool;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Powder bed-based additive manufacturing (AM) processes are characterized by very high-temperature gradients and solidification rates. These conditions lead to microstructures orders of magnitude smaller than in conventional casting processes. Especially in the field of high performance alloys, like nickel-base superalloys, this opens new opportunities for homogenization and alloy development. Nevertheless, the high susceptibility to cracking of precipitation-hardenable superalloys is a challenge for AM. In this study, electron beam-based AM is used to fabricate samples from gas-atomized pre-alloyed CMSX-4 powder. The influence of the processing strategy on crack formation is investigated. The samples are characterized by optical and SEM microscopy and analyzed by microprobe analysis. Differential scanning calorimetry is used to demonstrate the effect of the fine microstructure on characteristic temperatures. In addition, in situ heat treatment effects are investigated.
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页码：1469 / 1480
页数：11
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