| 镍含量对激光熔覆镍-铁基涂层结构与性能的影响 |
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| 引用本文： | 李瑞峰,黄坚,李铸国,张培磊,朱彦彦,吴毅雄.镍含量对激光熔覆镍-铁基涂层结构与性能的影响[J].中国表面工程,2010,23(2):56-59. |
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| 作者姓名： | 李瑞峰 黄坚 李铸国 张培磊 朱彦彦 吴毅雄 |
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| 作者单位： | 1. 上海交通大学,材料科学与工程学院,上海市激光制造与表面改性重点实验室,上海,200240;江苏科技大学,材料科学与工程学院,江苏,镇江,212003
2. 上海交通大学,材料科学与工程学院,上海市激光制造与表面改性重点实验室,上海,200240 |
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| 基金项目： | 国家自然科学基金，科技部国际科技合作资助项目，上海市国际科技合作，重大技术装备资助项目 |
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| 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。
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| 关 键 词： | 激光熔覆 重熔 非晶 镍基 铁基 |
Effect of Ni Content on the Structure and Properties of Laser Surface Clad Ni-Fe Based Alloys |
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| Affiliation: | 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 (Ni_(0.5)Fe_(0.5))_(62)Si_(18)B_(18)Nb_2(x/%) and (Ni_(0.6)Fe_(0.4))_(62)Si_(18)B_(18)Nb_2(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 Fe_2B, amorphous phase formed. |
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| Keywords: | laser cladding remelt amorphous nickel based iron based |
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