| B对FeCoCrNiSiBx高熵合金激光熔覆层组织和硬度的影响 |
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| 引用本文： | 赵龙志,喻世豪,赵明娟,唐延川,焦海涛,李劲,宋立军.B对FeCoCrNiSiBx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. |
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| 作者姓名： | 赵龙志 喻世豪 赵明娟 唐延川 焦海涛 李劲 宋立军 |
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| 作者单位： | 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 |
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| 基金项目： | 江西省科技厅科技项目;科研启动基金;国家自然科学基金 |
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| 摘 要： | 采用激光熔覆制备了FeCoCrNiSiBx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FeCoCrNiSiBx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。
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| 关 键 词： | 高熵合金熔覆层 激光熔覆 B元素 微观组织 硬度 |
| 收稿时间： | 2020-03-20 |
Effect of B on microstructure and hardness of FeCoCrNiSiBx high entropy alloy laser clad coating |
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| Zhao Longzhi,Yu Shihao,Zhao Mingjuan,Tang Yanchuan,Jiao Haitao,Li Jin,Song Lijun.Effect of B on microstructure and hardness of FeCoCrNiSiBx high entropy alloy laser clad coating[J].Heat Treatment of Metals,2020,45(10):187-190. |
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| Authors: | Zhao Longzhi Yu Shihao Zhao Mingjuan Tang Yanchuan Jiao Haitao Li Jin Song Lijun |
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| Affiliation: | 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 |
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| Abstract: | FeCoCrNiSiBx 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 FeCoCrNiSiBx 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. |
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| Keywords: | high entropy alloy coating laser cladding B element microstructure hardness |
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