B对FeCoCrNiSiBx高熵合金激光熔覆层组织和硬度的影响

doi:10.13251/j.issn.0254-6051.2020.10.036

金属热处理 ›› 2020, Vol. 45 ›› Issue (10): 187-190.DOI: 10.13251/j.issn.0254-6051.2020.10.036

B对FeCoCrNiSiB_x高熵合金激光熔覆层组织和硬度的影响

赵龙志¹, 喻世豪¹, 赵明娟¹, 唐延川¹, 焦海涛¹, 李劲², 宋立军^1,3

1.华东交通大学材料科学与工程学院, 江西南昌 330013;
2.南昌铁路局通达工贸有限责任公司, 江西南昌 330013;
3.湖南大学机械与运载工程学院, 湖南长沙 410082

收稿日期:2020-03-20 出版日期:2020-10-25 发布日期:2020-12-29
作者简介:赵龙志(1977—),男,教授,博士,博士生导师,主要研究方向为金属复合材料及激光加工技术,E-mail:zhaolongzhi@163.com
基金资助:
国家自然科学基金(51761012,51965022);江西省科技厅科技项目(20153BCB23005,20192BAB206028);华东交通大学科研启动基金(2003419036)

Effect of B on microstructure and hardness of FeCoCrNiSiB_x high entropy alloy laser clad coating

Zhao Longzhi¹, Yu Shihao¹, Zhao Mingjuan¹, Tang Yanchuan¹, Jiao Haitao¹, Li Jin², Song Lijun^1,3

1. School of Materials Science and Engineering, East China Jiaotong University, Nanchang Jiangxi 330013, China;
2. Tongda Industry and Trade Co.,Ltd.,Nanchang Railway Administration, Nanchang Jiangxi 330013 China;
3. College of Mechanical and Vehicle Engineering, Hunan University, Changsha Hunan 410082, China

Received:2020-03-20 Online:2020-10-25 Published:2020-12-29

摘要/Abstract

摘要： 采用激光熔覆制备了FeCoCrNiSiB_x高熵合金熔覆层,利用光学显微镜、扫描电镜、X射线衍射仪和显微硬度计研究微量硼元素(摩尔比x=0、0.02、0.04、0.06、0.08)对FeCoCrNiSiB_x高熵合金熔覆层组织和硬度的影响。结果表明:无B高熵合金涂层组织主要为胞状晶。B的添加会促进枝晶的生成,逐渐形成鱼骨状树枝晶,但过量的B会破坏枝晶完整性,形成蠕虫状晶。此外,高熵合金熔覆层组织为FCC和BCC双相结构,B元素的添加会形成大量0.1~2.6 μm的Cr₂B第二相,有助于提高熔覆层硬度,其中x=0.06时激光熔覆层的硬度最高,约为537 HV0.2。

关键词: 高熵合金熔覆层, 激光熔覆, B元素, 微观组织, 硬度

Abstract: FeCoCrNiSiB_x high-entropy alloy coating was prepared by laser cladding. The influence of trace boron element (molar ratio x=0, 0.02, 0.04, 0.06, 0.08) on the structure and hardness of FeCoCrNiSiB_x high-entropy alloy coating was study by using optical microscope, scanning electron microscopy, X-ray diffractometer and microhardness tester. The results indicate that the microstructure of FeCoCrNiSi high-entropy alloy coating can be mainly characterized by cellular. The addition of B promoted the formation of dendrites, resulting in fish-bone dendrites. However, the excessive content of B destroies the integrity of dendrites, leading to worm-like dendrite. In addition, the microstructure of the coating is composed of FCC and BCC phases. The addition of B element promotes the precipitation of Cr₂B particles of size 0.1-2.6 μm, which contributes the improvement of hardness of the clad coating. When the molar ratio of B is 0.06, the value of microhardness of the clad coating is highest as about 537 HV0.2.

Key words: high entropy alloy coating, laser cladding, B element, microstructure, hardness

中图分类号:

TG174

赵龙志, 喻世豪, 赵明娟, 唐延川, 焦海涛, 李劲, 宋立军. B对FeCoCrNiSiB_x高熵合金激光熔覆层组织和硬度的影响[J]. 金属热处理, 2020, 45(10): 187-190.

Zhao Longzhi, Yu Shihao, Zhao Mingjuan, Tang Yanchuan, Jiao Haitao, Li Jin, Song Lijun. Effect of B on microstructure and hardness of FeCoCrNiSiB_x high entropy alloy laser clad coating[J]. Heat Treatment of Metals, 2020, 45(10): 187-190.

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B对FeCoCrNiSiB_x高熵合金激光熔覆层组织和硬度的影响

Effect of B on microstructure and hardness of FeCoCrNiSiB_x high entropy alloy laser clad coating

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B对FeCoCrNiSiBx高熵合金激光熔覆层组织和硬度的影响

Effect of B on microstructure and hardness of FeCoCrNiSiBx high entropy alloy laser clad coating

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B对FeCoCrNiSiB_x高熵合金激光熔覆层组织和硬度的影响

Effect of B on microstructure and hardness of FeCoCrNiSiB_x high entropy alloy laser clad coating