Selective laser melting fabrication and cracking behavior of rene104 nickel-based superalloy

被引：0

作者：

Duan R.-X. ^{[1
]}

Huang B.-Y. ^{[1
]}

Liu Z.-M. ^{[1
]}

Peng K. ^{[1
]}

Lü X.-Q. ^{[1
]}

机构：

[1] State Key Laboratory of Powder Metallurg, Central South University, Changsha

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2018年 / 28卷 / 08期

关键词：

Carbide; Crack; Microstructure; Relative density; Rene104; superalloy; Selective laser melting;

D O I：

10.19476/j.ysxb.1004.0609.2018.08.10

中图分类号：

学科分类号：

摘要：

The Rene104 nickel-based superalloy was fabricated by selective laser melting technology with the scan strategy of rotation plus filling, and the impacts of process parameters on the microstructure and cracking behavior were investigated. The results show the linear energy density and hatch spacing are the main parameters that affect the density and cracking behavior of Rene104 nickel-based superalloy. When the energy density is 250 J/m, and the hatch spacing is 0.08 mm, the relative density of Rene104 nickel-based superalloy samples reaches 98.37%. The Rene104 alloy is mainly composed of columnar grains with the cross-sectional dimension of 0.5 μm and the axial dimension of 3-5 μm or 30 μm. The grain grows along the build direction with the strong (200) texture, while the carbides and Laves phases exist along the grain boundaries. The defects, including cracks, pores and remained powders, are also be found. The high linear energy density can cause the large temperature gradient and residual stress, which results in the stress concentration around precipitates. Therefore, the cracks initiate at the pool tip and interlayer junctions, then extend along the build direction. The remained pores are mainly caused by the powder hollow, and the remained powders are generated by the powder splash phenomenon. © 2018, Science Press. All right reserved.

引用

页码：1568 / 1578

页数：10

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