钢表面等离子弧复合熔覆工艺研究
关键词 Fe3Al 等离子弧表面熔覆 金属间化合物7377
毕业设计说明书（论文）外文摘要
Title Studying of plasma arc cladding on steel surface
Abstract
In order to improve the surface wear resistance of steel,Fe-A1
intermetallic coats were prepared on stee1 substrate by plasma arc cladding method with powders of Fe, Al, B, Si, Y2O3.Cladding of current, speed, swing were investigated. The results indicate that quality of surface is best when cladding of current, speed, swing is 130A, 8cm/min, 4mm. It had been found that the most hardness of the clad coating was 730.4HV0.3, about four higher than that of the substrate.The microstructure and phase constitution of the coat and the boundary between coat and substrate were studied with X—ray analysis technique. The results showed that compact coats jointed metallurgically with the steel were all obtained and the microstructure was found to consist of Fe3Al, FeAl2 and α- Fe phases mainly.
Keywords Fe3Al plasma surface cladding intermetallic compound
目 次
1 绪论 1
1.1 课题背景 1
1.2 Fe3Al金属间化合物性能特点以及发展现状 2
1.3 Fe3Al基金属间化合物涂层方法 3
1.4 课题主要内容 6
2 实验材料和过程 7
2.1 试验材料与设备 7
2.2 实验过程 8
3 等离子弧熔覆工艺 10
3.1 熔覆粉末配比及工艺的选择 10
3.2 熔覆电流 11
3.3 熔覆速度 13
3.4 焊枪摆幅 14
3.5 最佳参数验证 15
3.6 本章小结 15
4 等离子弧熔覆层的硬度分析 16
4.1 等离子弧熔覆层硬度的试验结果及分析 16
4.2 本章小结 22
5 等离子弧熔覆层的组织结构特征 23
5.1 等离子弧熔覆金相组织和成分分析 23
5.2 不同熔覆物对熔覆层组织性能对比 28
5.3 本章小结 29
致 谢 31
参考文献 32
1 绪论
1.1 课题背景
金属间化合物是指由2种金属组成的以金属键结合、并具有金属特性(如金属光泽、金属导电性及导热性等)的物质。它的结构不同于组成它的任一金属的结构，形成有序超点阵结构。由于这种结构特点，使它们具有许多特殊的物理化学和力学性质，如独特的电学性质、磁学性质、光学性质、声学性质、电子发射性质、催化性质、化学稳定性、热稳定性和高温强度等。长期以来，金属间化合物的结构性能和应用的研究一直引起人们的关注，已经发展成为许多类型的新材料，如高参数超导材料、强永磁材料、贮氢材料、形状记忆材料、热电子发射材料、耐高温和耐腐蚀涂层、高温结构材料等。