| 摘要: |
| 采用侧向同步送粉，激光熔覆+重熔的方式在低碳钢表面制备了两种Ni–Fe–Si–B–Nb合金涂层，化学成分分别为(Ni0.5Fe0.5)62Si18B18Nb2(原子数分数 x/%)和(Ni0.6Fe0.4)62Si18B18Nb2(x /%)。探讨Ni含量变化对涂层物相组成、显微组织及其性能的影响。试验结果表明，当Ni和Fe的比为1:1时，涂层重熔层物相分析表现为非晶特征的漫散射峰，微观组织由等轴晶+非晶构成，而当Ni和Fe的比为3:2时，涂层重熔层物相分析无漫散射峰形成，微观组织为树枝晶。同时树枝晶组织的显微硬度值较低，这和涂层内部形成的奥氏体较多，而且无Fe2B相和非晶相生成有关。 |
| 关键词: 激光熔覆 重熔 非晶 镍基 铁基 |
| DOI： |
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| 基金项目:国家自然科学基金项目(50971091)，科技部国际科技合作资助项目(2009DFB50350)，上海市国际科技合作(08520704900)和重大技术装备资助项目(ZX08089） |
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| Effect of Ni Content on the Structure and Properties of Laser Surface Clad Ni-Fe Based Alloys |
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LI Rui–feng, HUANG Jian, LI Zhu–guo, ZHANG Pei–lei, ZHU Yan–yan, WU Yi–xiong1,2
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1.Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240;2.School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang Jiangsu 212003
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| Abstract: |
| Two kinds of Ni–Fe–Si–B–Nb alloy coating were obtained using lateral synchronous feeding powder laser cladding process on mild carbon steel surface, the chemical compositions of two alloys are (Ni0.5Fe0.5)62Si18B18Nb2(x/%) and (Ni0.6Fe0.4)62Si18B18Nb2(x/%), respectively. The effect of Ni content on the phase composition, microstructure and micro–hardness is studied. For Ni: Fe in the ratio of 1:1, XRD pattern indicated the presence of an amorphous phase and SEM results showed equiaxial crystal and amorphous structure in the re–melted layer. But for Ni: Fe in the ratio of 3:2, no evidence of amorphous phase and only dendrite structure with low micro–hardnee is formed in the re–melted layer. The low micro–hardness is due to the large proportion of austenite phase and no Fe2B, amorphous phase formed. |
| Key words: laser cladding remelt amorphous nickel based iron based |
