Al对激光熔覆镍基合金涂层组织与性能的影响

doi:10.11896/cldb.18030211

材料导报

2019, Vol. 33

Issue (12): 2035-2039 https://doi.org/10.11896/cldb.18030211

金属与金属基复合材料

Al对激光熔覆镍基合金涂层组织与性能的影响

蒋智秋¹, 陈泉志¹, 董婉冰¹, 童庆¹, 李伟洲^1,2

1 广西大学资源环境与材料学院,南宁 530004
2 广西有色金属及特色材料加工重点实验室,南宁 530004

Effect of Aluminum on Microstructure and Performance of Laser CladdingNi-based Alloy Coating

JIANG Zhiqiu¹, CHEN Quanzhi¹, DONG Wanbing¹, TONG Qing¹, LI Weizhou^1,2

1 School of Resoures, Environment and Materials, Guangxi University, Nanning 530004
2 Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University, Nanning 530004

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摘要为了提高球墨铸铁熔覆镍基合金涂层的性能,分别向镍基合金中添加0%、2%、4%、6%、8%(质量分数,下同)的Al。通过SEM、XRD、显微硬度、摩擦磨损、高温氧化实验分析了不同Al添加量对镍基合金熔覆层的显微组织、硬度、耐磨性能、抗高温氧化性能的影响。结果表明, Al的添加能提高镍基熔覆层的成型性,但当Al含量超过4%时,熔覆层出现了贯穿性裂纹缺陷。通过预置镍基中间过渡层,在无裂纹缺陷的前提下,可以将熔覆层中外加Al含量由原来的4%提高至8%。显微硬度实验表明,8%Al熔覆层的显微硬度最大,为740HV,是0%Al熔覆层的1.85倍。摩擦磨损实验表明,6%Al熔覆层上午耐磨性最好,磨损量仅为0%Al熔覆层的25%。850 ℃高温氧化实验表明,8%Al熔覆层在氧化120 h后的抗氧化性最好,氧化产物为Al₂O₃、NiCr₂O₄、(Fe,Cr)₂O₃、γ-Ni,氧化增重为1.89 mg/cm²,仅为0%Al熔覆层的35%。

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关键词: 球墨铸铁激光熔覆摩擦磨损高温氧化

Abstract: In order to improve the performance of Ni based alloy coating 0wt%, 2wt%, 4wt%, 6wt% and 8wt% Al elements were added to Ni based alloy.The effects of Al addition on the wear resistance,high temperature oxidation resistance and thermal fatigue resistance of Ni based alloy were analyzed by SEM, XRD, friction and wear, high temperature oxidation and thermal shock test. The results show that, with the addition of aluminum could significantly improve the cladding formability, but when the aluminum content was more than 4wt%, the cracks appeared. By presetting the Ni based intermediate layer, the content of Al in the coatings could be increased from 4wt% to 8wt% at the premise of no crack defect. The microhardness experiment showed that when the aluminum content was 8wt%, the microhardness of the coating was 740HV, which was 1.85 times of that of the nickel-based coating. The tests of friction and wear showed that the wear resistance of the coating was best at the aluminum content of 6wt% which wear mass loss was 25% of the nickel-based coating. The high temperature oxidation results showed that the oxidation resistance of the coating with 8wt% aluminum content after 850 ℃/120 h oxidation was the best, the Al₂O₃, NiCr₂O₄, (Fe,Cr)₂O₃ and γ-Ni phases formed on the annealed coating, and the oxidation weight gain rate was 1.89 mg/cm², which was only 35% of the nickel-based coating.

Key words: nodular cast iron laser cladding friction and wear high temperature oxidation

出版日期: 2019-06-20 发布日期: 2019-05-31

ZTFLH:

TG174

基金资助: 国家自然科学基金(51371059;51001032);广西科技重大专项(AA18118030;AA17204100);广西自然科学基金项目(2014GXNSFCA118013;2016GXNSFDA380022);广西高等学校高水平创新团队项目(第二批)

通讯作者: liwz2008@hotmail.com

作者简介: 蒋智秋,2017年12月毕业于广西大学,获得工程硕士学位。主要从事激光熔覆再制造领域的研究。李伟洲,博士(后),研究员,博士生导师。广西高等学校卓越学者,南京市“321”科技创业人才计划。主要从事材料的腐蚀及表面防护研究工作。在 Corrosion Science、Applied Surface Science、Surface and Coatings Technology、Journal of Materials Research等国际重要学术刊物上合作发表学术论文90余篇,授权国家发明专利10余项。

引用本文:

蒋智秋, 陈泉志, 董婉冰, 童庆, 李伟洲. Al对激光熔覆镍基合金涂层组织与性能的影响[J]. 材料导报, 2019, 33(12): 2035-2039.
JIANG Zhiqiu, CHEN Quanzhi, DONG Wanbing, TONG Qing, LI Weizhou. Effect of Aluminum on Microstructure and Performance of Laser CladdingNi-based Alloy Coating. Materials Reports, 2019, 33(12): 2035-2039.

链接本文:

http://www.mater-rep.com/CN/10.11896/cldb.18030211 或 http://www.mater-rep.com/CN/Y2019/V33/I12/2035

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