感应加热对激光增材修复高温合金DZ125L组织和力学性能的影响

doi:10.3901/JME.2021.22.052

机械工程学报 ›› 2021, Vol. 57 ›› Issue (22): 52-59.doi: 10.3901/JME.2021.22.052

• 特邀专栏：耦合材料-结构的设计与评估方法 • 上一篇下一篇

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感应加热对激光增材修复高温合金DZ125L组织和力学性能的影响

李尧^1,2, 党晓凤³, 陈凯², 何卫锋³

1. 长安大学材料科学与工程学院西安 710046;
2. 西安交通大学材料科学与工程学院西安 710049;
3. 空军工程大学航空等离子体动力学国防科技重点实验室西安 710038

收稿日期:2020-12-20 修回日期:2021-10-02 出版日期:2021-11-20 发布日期:2022-02-28
通讯作者: 陈凯(通信作者),男,1983年出生,博士,教授。主要研究方向为金属材料微观组织结构与先进表征技术。E-mail:kchenlbl@gmail.com
作者简介:李尧,男,1991年出生,博士,讲师。主要研究方向为3D打印金属微观组织结构。E-mail:liyaomse@chd.edu.cn
基金资助:
国家自然科学基金（51901026，91860109和51927801）、国家重点研发计划（2016YFB0700404）和长安大学中央高校基本科研业务费专项（300102319301）资助项目。

Effect of Induction Heating on the Microstructure and Mechanical Property of Laser Additively Repaired Ni-based Superalloy DZ125L

LI Yao^1,2, DANG Xiaofeng³, CHEN Kai², HE Weifeng³

1. School of Material Science and Engineering, Chang'an University, Xi'an 710046;
2. School of Material Science and Engineering, Xi'an Jiaotong University, Xi'an 710049;
3. Science and Technology on Plasma Dynamics Laboratory, Air Force Engineering University, Xi'an 710038

Received:2020-12-20 Revised:2021-10-02 Online:2021-11-20 Published:2022-02-28

摘要/Abstract

摘要： 通过研究感应加热条件下激光增材修复高温合金DZ125L的组织和显微硬度分布规律，揭示了感应加热对高温合金修复层附近组织与性能的调控机制。结果表明，与无感应加热样品相比，1 000℃感应加热可以有效降低温度梯度，进而导致修复层枝晶间距由3.8 μm增加到7.2 μm，γ'强化相尺寸从19.8 nm增加到74.0 nm，热影响区范围由200 μm增加至500 μm。在热影响区中，显微硬度持续增加，并在修复层维持恒定。热影响区硬度值的连续增加主要与一次γ'和二次γ'的体积分数变化有关，而修复层硬化机制主要与不同尺寸γ'的强化效果有关。

关键词: 激光增材制造, 感应加热, 镍基高温合金, 显微组织, 力学性能

Abstract: By studying the microstructure and microhardness of the laser additive repair of directionally solidified superalloy DZ125L under an induction heating condition, the effect of induction heating on the formation mechanism of microstructure and the evolution of mechanical properties near the interface between repair layers and substrate is revealed. The results show that induction heating at 1 000℃ can effectively reduce the temperature gradient in comparison with the sample without induction heating. As a result, in repair layers, the primary dendrite arm spacing increases from 3.8 μm to 7.2 μm, γ' particles grow from 19.8 nm to 74.0 nm, and the heat affected zone(HAZ) extends from 200 μm to 500 μm. The microhardness continuously increases in the HAZ and reaches a plateau in the repair layers. The increased microhardness in the HAZ is mainly attributed to the volume fraction change of primary and secondary γ' precipitates, whereas the hardening mechanism in the repair layers is related to the γ'-size-dependent strengthening effect.

Key words: laser additive manufacturing, induction heating, Ni-based superalloys, microstructure, mechanical properties

中图分类号:

TG132

李尧, 党晓凤, 陈凯, 何卫锋. 感应加热对激光增材修复高温合金DZ125L组织和力学性能的影响[J]. 机械工程学报, 2021, 57(22): 52-59.

LI Yao, DANG Xiaofeng, CHEN Kai, HE Weifeng. Effect of Induction Heating on the Microstructure and Mechanical Property of Laser Additively Repaired Ni-based Superalloy DZ125L[J]. Journal of Mechanical Engineering, 2021, 57(22): 52-59.

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感应加热对激光增材修复高温合金DZ125L组织和力学性能的影响

Effect of Induction Heating on the Microstructure and Mechanical Property of Laser Additively Repaired Ni-based Superalloy DZ125L

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