Microstructure and mechanical properties of crack-free Ni-based GH3536 superalloy fabricated by laser solid forming

被引：16

作者：

Xiao, Lairong ^{[1
,2
]}

Peng, Zhenwu ^{[1
]}

Zhao, Xiaojun ^{[1
,2
]}

Tu, Xiaoxuan ^{[1
]}

Cai, Zhenyang ^{[1
]}

Zhong, Qi ^{[1
]}

Wang, Sen ^{[1
]}

Yu, Huali ^{[1
]}

机构：

[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

[2] Cent South Univ, Key Lab Nonferrous Met Mat Sci & Engn, Minist Educ, Changsha 410083, Hunan, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 921卷

基金：

中国国家自然科学基金;

关键词：

High -temperature alloys; Laser solid forming; GH3536; alloy; Fatigue crack growth; TEMPERATURE; BEHAVIOR;

D O I：

10.1016/j.jallcom.2022.165950

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：

Laser solid forming (LSF) was used to fabricate dense and crack-free specimens from solution-strengthened nickel-based superalloy GH3536 in this study. Tensile, and fatigue crack growth (FCG) testing was carried out in both horizontal and vertical build orientations with the condition at 25 degrees C and 500 degrees C. Three regions can be detected in the specimen: the additive manufacturing zone (AM), the heat affected zone (HAZ) and the substrate. M23C6 and M6C carbides were found in the specimens, only a small amount of hole defects was observed in the samples, and no cracks were found. The tensile test results show that the specimens have obvious anisotropy, and the horizontal specimens displayed higher strength (up to 855.3 MPa ultimate tensile strength at 25 degrees C). It is worth noting that there is no obvious anisotropy in the FCG rates of the specimens in different directions, and only when the Delta K is about 45-60 MPa m1/2, the FCG rates of the vertical specimens are higher. The increase in temperature will significantly reduce the tensile performance and increase the FCG rate of the specimens. (c) 2022 Elsevier B.V. All rights reserved.

引用

页数：10

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