DZ125高温合金激光熔覆组织及其耐腐蚀性能研究

吴雨莼, 陈泰黎, 牛凡, 景文凯, 韦文磊, 余磊, 侯廷红, 蔡振兵

doi:10.16577/j.issn.1001-1560.2025.0077

材料保护 >

2025 , Vol. 58 >Issue 5: 63 - 71

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0077

激光表面改性技术专栏

DZ125高温合金激光熔覆组织及其耐腐蚀性能研究

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1.成都航利(集团)实业有限公司 2.西南交通大学摩擦学研究所

侯廷红(1973－)，博士，主要研究方向为航空发动机修理技术，电话:13540353516， E-mail:christmaseve73＠163.com

收稿日期: 2024-11-28

修回日期: 2025-01-22

录用日期: 2025-01-23

网络出版日期: 2025-06-10

基金资助

国家重点研究发展计划(2022YFB3401900)；四川省科技项目(2022JDJQ0019)资助

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Microstructure and Corrosion Resistance of DZ125 Superalloy via Laser Cladding

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(1.Cheng Du Hang Li (Group) Industrial Co.， Ltd.， Chengdu 611937， China；2.Tribology Research Institute， Southwest Jiaotong University， Chengdu 610031， China)

HOU Tinghong(1973－)， Ph.D.， Research Focus: Aero-Engine Repair Technology， Tel.: 13540353516， Email:christmaseve73＠163.com

Received date: 2024-11-28

Revised date: 2025-01-22

Accepted date: 2025-01-23

Online published: 2025-06-10

Supported by

National Key Research and Development Program(2022YFB3401900)； Science and Technology Project of Sichuan Province(2022JDJQ0019)

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摘要

为了进一步研究DZ125 镍基高温合金在激光熔覆修复后的微观组织性能，本研究采用激光熔覆技术将CoCrW 粉末熔覆在基体表面，制备了熔覆层。随后分别对基材(BM 试样)和熔覆试样(LC 试样)在700 ℃下进行100 h 的高温保温试验。将基材和熔覆试样的表面进行了盐膜涂敷，并在相同高温条件下进行100 h 的保温试验，分析高温氧化腐蚀对合金显微组织、显微硬度及成分组成的影响，探究在涂盐热腐蚀环境下熔覆层的耐腐蚀性能。结果表明:从基材到过渡层和熔覆组织，显微硬度逐渐增加，熔覆组织的硬度高达559 HV0.2，试样在高温下保温后产生了明显的氧化，热盐环境下的试样氧化程度加剧，氧化层的厚度相对无盐环境下出现明显增厚，并且出现了更多的剥落坑。但是相对BM 试样，LC 试样在2 种环境下的氧化程度较轻，这表明激光熔覆组织相对基材具有更强的耐腐蚀氧化性能。

关键词： DZ125 高温合金; 激光沉积技术; 氧化; 涂盐热腐蚀; 显微组织

本文引用格式

吴雨莼, 陈泰黎, 牛凡, 景文凯, 韦文磊, 余磊, 侯廷红, 蔡振兵 . DZ125高温合金激光熔覆组织及其耐腐蚀性能研究[J]. 材料保护, 2025 , 58(5) : 63 -71 . DOI: 10.16577/j.issn.1001-1560.2025.0077

Abstract

To further investigate the microstructural properties of DZ125 nickel-based superalloy after laser cladding repair，this study employed laser cladding technology to deposit CoCrW powder onto the substrate surface，thereby fabricating a cladding layer.Subsequently，both the base material (BM specimen) and the cladded specimen (LC specimen) underwent a 100 h high-temperature exposure test at 700 °C.Salt films were applied to the surfaces of both the base material and cladded specimens， followed by a 100 h exposure test under identical high-temperature conditions.Meanwhile， the effects of high-temperature oxidative corrosion on the alloy’s microstructure， microhardness and compositional characteristics were analyzed， and the corrosion resistance of the cladding layer under salt-deposited hot corrosion conditions was explored.Results showed that the microhardness increased gradually from the base material to the transition layer and the cladding structure， and the hardness of the cladding structure was up to 559 HV0.2.After high-temperature exposure， the specimens exhibited significant oxidation， with those in the hot salt environment demonstrating exacerbated oxidation severity.Compared to salt-free conditions， the oxide layer thickness showed a significant increase under salt deposition，accompanied by more extensive spalling pits.However，compared to the BM specimen，the LC specimen demonstrated milder oxidation in both environments， indicating that the laser-cladded microstructure possessed superior corrosion and oxidation resistance relative to the base material.

Key words： DZ125 high-temperature alloy; laser cladding technology; oxidation; salt coated hot corrosion; microstructure

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