Towards creep property improvement of selective laser melted Ni-based superalloy IN738LC

被引：34
作者：
Song, H. Y. [1 ,2 ]
Lam, M. C. [1 ,2 ]
Chen, Y. [3 ]
Wu, S. [1 ,2 ]
Hodgson, P. D. [4 ]
Wu, X. H. [1 ,2 ]
Zhu, Y. M. [1 ,2 ]
Huang, A. J. [1 ,2 ]
机构：
[1] Monash Ctr Addit Mfg, 15-17 Normanby Rd, Notting Hill, Vic 3168, Australia
[2] Monash Univ, Dept Mat Sci & Engn, Clayton, Vic 3800, Australia
[3] Monash Ctr Electron Microscopy, 10 Innovat Walk, Clayton, Vic 3800, Australia
[4] Deakin Univ, Inst Frontier Mat, Geelong, Vic 3216, Australia
来源：
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY | 2022年 / 112卷
关键词：
Selective laser melting; IN738LC alloy; Creep properties; Heat treatments; Grain structure; GRAIN-BOUNDARY MOBILITY; NICKEL-BASED SUPERALLOY; HEAT-TREATMENT; MECHANICAL-PROPERTIES; MELTING SLM; MICROSTRUCTURE; ALLOY; BEHAVIOR; GROWTH; PRECIPITATION;
D O I：
10.1016/j.jmst.2021.09.050
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Nickel-based superalloy IN738LC produced by selective laser melting (SLM) exhibits inferior hightemperature creep properties than its cast counterparts due to relatively smaller grain size, particularly for the plane normal to the building direction. This work studied effects of post heating strategy on the microstructure and especially the grain size to improve the high temperature creep resistance. The asbuilt microstructure exhibited a fine grain size and large quantities of M C carbides that could effectively hinder grain growth. It was found that unconventional two-step heat treatments could lead to substantial grain growth, and the effect is particularly prominent at a specific temperature. The ease of grain growth was explained after classifying the microstructural evolution (boundary carbide transformation) during each heating step and related to the reduced grain boundary pinning force from M C carbides. Creep tests validated the effect of the new heat treatment scheme on the SLM-processed IN738LC at 850 degrees C. An extended creep fracture life (1.5 to 4 times improvement) and lower secondary creep rates were achieved with samples subjected to the newly optimized two-step heat treatment. The complete creep curves are also firstly presented for SLM-IN738LC, confirming the effectiveness of grain growth and highlighting the importance of dedicated heat treatment for SLM superalloys. (c) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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收藏
页码：301 / 314
页数：14
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