Microstructure and stress-rupture property of DD32 nickel-based single crystal superalloy fabricated by additive manufacturing

被引：36

作者：

Ci, Shiwei ^{[1
,2
]}

Liang, Jingjing ^{[1
,3
,4
]}

Li, Jinguo ^{[1
,4
]}

Wang, Haiwei ^{[1
,2
]}

Zhou, Yizhou ^{[1
]}

Sun, Xiaofeng ^{[1
]}

Ding, Yutian ^{[5
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

[2] Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 230026, Peoples R China

[3] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

[4] Space Mfg Technol, CAS Key Lab, Beijing 100094, Peoples R China

[5] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Non Ferrous Me, 287 Langongping Rd, Lanzhou 730000, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 854卷

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

Additive manufacturing; Nickel-based superalloy; Single crystal; Stress rupture property; Micro structures; STRAY-GRAIN FORMATION; FRACTURE BEHAVIORS; DIRECTIONAL SOLIDIFICATION; MC CARBIDE; CREEP; PRECIPITATION; DECOMPOSITION; DEFORMATION; PARAMETERS; DEPOSITION;

D O I：

10.1016/j.jallcom.2020.157180

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Additive manufacturing (AM) technology is currently undergoing rapid development in the aerospace field. However, due to the intense cracking susceptibility, additive manufacturing of nickel-based single-crystal (SX) superalloys still presents major challenges. In this paper, the crack-free SX superalloy is fabricated directly using pulsed laser. The microstructure and stress rupture property of the additively manufactured SX superalloy after heat treatment are carefully investigated and compared with conventional cast alloy. The results show that the stress rupture life of the AM sample (66.4 h) is longer than that of the cast sample (59.1 h). This is related to the difference of microstructure between AM and cast samples. AM samples have a finer dendritic structure and lower inter-dendritic segregation, which is conducive to solution strengthening and avoids the formation of TCP phase. Besides, the carbides in the AM sample is finer and evenly distributed, which is conducive to precipitation strengthening; The fine carbides are enveloped within layers of y' in the AM samples, which avoids the formation of cracks caused by separation of carbides and the matrix. All of those are beneficial to improve stress rupture properties. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：12

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