Effect of post treatment on microstructure and property of Inconel 718 superalloy fabricated by laser remelting

被引：0
作者：
Li Y. [1 ]
Yang H. [1 ]
He H.-W. [1 ]
Zhang J. [1 ]
Zhang M.-Y. [1 ]
Li M.-Y. [1 ]
Hao J.-M. [1 ]
机构：
[1] School of Materials Science and Engineering, Chang'an University, Xi'an
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2022年 / 32卷 / 06期
基金：
中国国家自然科学基金;
关键词：
Heat treatment; Inconel; 718; superalloy; Laser remelting; Ultrasonic impact treatment;
D O I：
10.11817/j.ysxb.1004.0609.2021-36790
中图分类号：
学科分类号：
摘要：
The effect of heat treatment and ultrasonic impact treatment (UIT) on the evolution of microstructure and microhardness of laser remelted Inconel 718 superalloy was studied by optical microscopy, scanning electron microscopy and electron backscatter diffraction techniques. The results show that the fusion zone (FZ) of as-received (AR) sample is mainly composed of γ dendrite core and interdendritic Laves phase. After solution heat treatment (SHT), the majority of Laves phase dissolves and the element segregation weakens, the microhardness reduce. After the solution + double aging treatment (SDA), a large number of γ' and γ″ strengthening phases precipitate, significantly improve the microhardness. In addition, the direct double aging treatment (DA) sample are similar with the SDA sample in microstructural morphology, which is associated with the undissolved Laves phases due to the relatively low aging temperature. Simultaneously, the γ' and γ″ strengthening phases are completely precipitated after aging, resulting in a significant microhardness increment comparable to that of SDA sample. After UIT treatment, severe plastic deformation together with compressive stress and high-density dislocations is produced near the surface of the four samples but the obtained hardening layers ranged indistinct depths. The strengthening effect of UIT on the SDA and DA samples is not as significant as the AR and SHT samples, which is mainly due to the strong interaction between γ'/γ″ strengthening phases and dislocations. © 2022, China Science Publishing & Media Ltd. All right reserved.
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页码：1673 / 1684
页数：11
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