Laves phase control of Inconel 718 alloy using quasi-continuous-wave laser additive manufacturing

被引：221
作者：
Xiao, Hui [1 ,2 ]
Li, Simeng [1 ,2 ]
Han, Xu [1 ,2 ]
Mazumder, Jyoti [1 ,2 ,3 ]
Song, Lijun [1 ,2 ]
机构：
[1] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Bodies, Changsha 410082, Hunan, Peoples R China
[2] Hunan Univ, Hunan Prov Key Lab Intelligent Laser Mfg, Changsha 410082, Hunan, Peoples R China
[3] Univ Michigan, Ctr Laser Aided Intelligent Mfg, Ann Arbor, MI 48109 USA
来源：
MATERIALS & DESIGN | 2017年 / 122卷
基金：
中国国家自然科学基金;
关键词：
Laser additive manufacturing; Quasi-continuous-wave laser; Ni-base superalloy; Laves; Segregation; NICKEL-BASED SUPERALLOY; LIQUATION CRACKING; HEAT-TREATMENT; DEPOSITION; MICROSTRUCTURE; IN718; SEGREGATION; LAYER; STEEL;
D O I：
10.1016/j.matdes.2017.03.004
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Nb segregation and Laves phase formation are known to be detrimental to mechanical properties of Inconel 718. However, effective efforts to suppress Nb segregation and Laves phase formation are still lacking. In this work, a quasi-continuous-wave (QCW) laser additive manufacturing (LAM) is used to control Nb segregation and Laves phase formation. Thermal behaviors of the molten pool, microstructural evolution and mechanical response of the fabricated samples to aging treatment were investigated. Compared to continuous wave (CW) LAM, QCW-LAM results in a refined and equiaxed dendrite microstructure, a reduced Nb segregation, and attended fine and discrete Laves phase particles, due to an improved cooling rate with one order of magnitude and a decreased solidification time of the molten pool. In addition, the QCW sample shows a good response to aging treatment with a higher hardness and more desired tensile properties due to the reduced Nb segregation, the obtained fine discrete Laves phase and the refined dendrite microstructure. The tensile strength (similar to 1404.1 MPa), the yield strength (similar to 1120.6 MPa) and the ductility (similar to 12.4 pct) of the aged QCW sample are higher than the ASTM limits of the wrought Inconel 718 alloy. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：330 / 339
页数：10
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