Causes analysis on cracks in nickel-based single crystal superalloy fabricated by laser powder deposition additive manufacturing

被引：126

作者：

Zhou, Zhipeng ^{[1
]}

Huang, Lan ^{[1
,2
]}

Shang, Yijing ^{[1
]}

Li, Yunping ^{[2
]}

Jiang, Liang ^{[2
]}

Lei, Qian ^{[1
,2
]}

机构：

[1] Cent S Univ, Powder Met Res Inst, Changsha 410083, Peoples R China

[2] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

来源：

MATERIALS & DESIGN | 2018年 / 160卷

关键词：

Superalloy; Single crystal; Crack; Laser powder deposition; Additive manufacturing; MICROSTRUCTURE FORMATION; STRESS-CONCENTRATION; LIQUATION CRACKING; SOLIDIFICATION; GROWTH; ZONE; EPITAXY; REPAIR; PORES; MODEL;

D O I：

10.1016/j.matdes.2018.10.042

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Additive manufacturing is an advanced forming method to fabricate complex components, while cracks appear in the deposited nickel-based single crystal superalloy samples undesirably. Though fabrication of crack-free superalloy were reported, effective solutions to fabricate crack-free nickel-based single crystal superalloy samples are still uncovered, thus the additivemanufacturing in single crystal superalloy is still an extremely difficultwork. In this work, we fabricated nickel-based single crystal superalloy samples through laser powder deposition, and analyzed the causes of crack during deposition processing. Experimental results demonstrate that the asdeposited thin-wall samples presented single crystal structure and its crystal orientation is well aligned with the [001] orientation of substrate, while some cracks appeared in the as-deposited block samples. Large misorientation angle in the local regions played significant roles in the cracks initiation and the further cracking propagation. Solidification cracks are attributed to the shrinkage cavities and the high-melting point interdendritic carbides, while liquation cracks are attributed to the low melting point compounds. These findings give a guide for causes analysis on cracks in the nickel-based single crystal superalloy fabricated by laser powder deposition additive manufacturing, which has bright prospects in single crystal superalloy manufacturing and repair. (c) 2018 Elsevier Ltd. All rights reserved.

引用

页码：1238 / 1249

页数：12

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