| 摘要: |
| 基于激光增材制造技术，在不锈钢基板上制备了321不锈钢熔覆层，利用金相显微镜和显微硬度计分析熔覆层的显微组织和显微硬度，利用XRD衍射仪分析熔覆层的成分，利用摩擦磨损试验机和电位极化曲线分析熔覆层的耐磨和耐腐蚀性能。研究结果表明，熔覆层与基体之间呈现良好的冶金结合。熔覆层主要由胞状晶和树枝晶组成；显微硬度约为410HV；由于基材的混入，熔覆层中出现α-Fe；磨损量约为0.0108g，是基材的0.09倍；自腐蚀电流密度为3.272×10-7A/cm2，优于基材的4.303×10-7A/cm2。 |
| 关键词: 增材制造 321不锈钢 显微组织 耐磨性 耐腐蚀性 |
| 基金项目: |
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| Microstructure and Properties of Laser Additive Manufacturing 321 Stainless Steel |
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Wang Zhaoyang Xiao Changyuan Li Changlin Li Syuan Fu Yifeng Zhu Tianfang Liu Ce Yuan Liming
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Capital Aerospace Machinery Co., Ltd., Beijing 100076
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| Abstract: |
| Based on the technology of laser additive manufacturing, the 321 stainless steel alloy coating was coated on the surface of stainless steel. The microstructure and microhardness of the cladding layer were analyzed by optical microscopy and microhardness tester. The composition of the cladding layer was analyzed by XRD. The wear resistance and corrosion resistance of the cladding layer were analyzed by wear tester and polarization curve. The results showed that the cladding layer exhibited metallurgical bonding to the substrate. The microstructures of the cladding layer were composed of cell and dendrites crystals. The microhardness of the cladding layer is about 410HV; The α-Fe appears in the cladding layer due to the mixing of the substrate, abrasion loss of the cladding layer was 0.0108g, 0.09 times that of the substrate; self-corrosion current density was 3.272×10-7A/cm2, better than 4.303×10-7A/cm2 of substrate. |
| Key words: additive manufacturing 321 stainless steel microstructure wear resistance corrosion resistance |
