科技导报 >

2024 , Vol. 42 >Issue 22: 93 - 101

DOI: https://doi.org/10.3981/j.issn.1000-7857.2023.02.00238

论文

热处理对激光熔覆高Co-Ni钢涂层组织和性能的影响

  • 秦仁耀 ,
  • 张国会 ,
  • 陈冰清 ,
  • 李能 ,
  • 刘伟 ,
  • 黄帅 ,
  • 高超 ,
  • 郭绍庆
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  • 中国航发北京航空材料研究院焊接与塑性成形研究所, 北京 100095
秦仁耀,高级工程师,研究方向为航空关键件增材修复及电子束增材制造技术,电子信箱:529392330@qq.com;张国会(通信作者),工程师,研究方向为航空关键件增材修复,电子信箱:guohui-zhang@foxmail.com

收稿日期: 2023-02-16

  修回日期: 2023-03-27

  网络出版日期: 2024-07-11

基金资助

国家自然科学基金项目（51701198，51775525）

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Effect of heat treatment on microstructure and mechanical properties of laser cladded high Co-Ni steel coating

  • QIN Renyao ,
  • ZHANG Guohui ,
  • CHEN Bingqing ,
  • LI Neng ,
  • LIU Wei ,
  • HUANG Shuai ,
  • GAO Chao ,
  • GUO Shaoqing
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  • 3D Printing Research and Engineering Technology Center, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China

Received date: 2023-02-16

  Revised date: 2023-03-27

  Online published: 2024-07-11

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摘要

研究了热处理对激光熔覆高Co-Ni钢涂层组织和显微硬度的影响。通过使用光学显微镜、扫描电子显微镜和能谱，分析了涂层的微观组织，采用维氏硬度仪测试了涂层的显微硬度。结果表明，当热处理温度从200℃提高至600℃时，晶界残余奥氏体因发生分解反应而显著减少，针状M3C渗碳体和棒状M2C碳化物的数量则明显增加；经550℃和600℃热处理后，M2C碳化物均发生明显粗化。当热处理温度为200~400℃时，析出的细小M2C碳化物与基体有着良好的共格关系，故涂层的显微硬度值随着M2C碳化物增加而增加，当温度继续升至600℃时，M2C碳化物粗化，与基体失去共格关系，且基体中位错恢复，导致涂层的显微硬度急剧下降。

关键词： 热处理; 激光熔覆; 高Co-Ni钢; 涂层; 显微硬度

本文引用格式

秦仁耀 , 张国会 , 陈冰清 , 李能 , 刘伟 , 黄帅 , 高超 , 郭绍庆 . 热处理对激光熔覆高Co-Ni钢涂层组织和性能的影响[J]. 科技导报, 2024 , 42(22) : 93 -101 . DOI: 10.3981/j.issn.1000-7857.2023.02.00238

Abstract

The effect of post-heat treatment on the microstructure and microhardness of laser cladded high Co-Ni secondary hardening steel coating was investigated. The microstructure of the coating was analyzed using a scanning electron microscopy (SEM) equipped with an energy dispersive spectrometer (EDS), and the microhardness was measured with a Vickers indenter. Decomposition of the retained austenite in the coating occurred during the post-heat treatment. As the temperature increased from 200 ℃ to 600 ℃, the quantity of the retained austenite at the boundaries decreased significantly, while that of the needleshaped M3C cementite and M2C carbides increased. The M2C carbides evidently coarsened when the temperature was 550 ℃ and 600 ℃. The microhardness of high Co-Ni steel coating increased as the temperature of heat treatment increased from 200 ℃ to 400 ℃ because the fine-scale M2C carbides were coherent with the matrix and increased distinctly in this temperature range. While the microhardness decreased sharply when the temperature was improved from 500 ℃ to 600 ℃ due to both the incoherency of the coarsened M2C carbides and the recovery of dislocations in the carbon-supersaturated matrix.

Key words： heat treatment; laser cladding; high Co-Ni steel; coating; microhardness

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