Effect of a small addition of Ti on the Fe-based coating by laser cladding
Effect of a small addition of Ti on the Fe-based coating by laser cladding
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少量Ti添加对激光熔覆铁基涂层的影响
DOI：
10.1016/j.surfcoat.2016.03.015
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发表时间：
2016-04-15
影响因子：
5.4
通讯作者：
Lin, Xuechun
中科院分区：
文献类型：
--
作者：
Gao, Wenyan;Zhang, Zhiyan;Lin, Xuechun
采用不同钛含量的铁基粉末在低碳钢基体上进行激光熔覆制备涂层。系统研究了Ti及其含量对熔覆层组织、相组成和显微硬度的影响。结果表明，在铁基合金粉末中加入Ti元素后，涂层的形貌和组织发生了明显的变化。组织由枝晶转变为等轴晶或枝晶，组织细化均匀。另外，随着Ti含量的增加，镀层的稀释率增大，镀层中晶相尺寸变大，使得高掺杂镀层的硬度急剧下降。同时，对这些差异产生的原因进行了详细的分析。最后，通过比较，铁基复合材料与1wt.% Ti涂层具有最理想的性能。在送粉速度与扫描速度之比一定的情况下，具有较高的硬度，对扫描速度不敏感。熔覆层的硬度分布更加稳定。(C)2016爱思唯尔B.V.保留所有权利。
In this study, the coatings were fabricated on a low carbon steel substrate by laser cladding using the Fe-based powders mixed with different Ti content. The effects of the Ti and its content on the microstructure, phase compositions and microhardness of the clad layers are studied systematically. The results show that, the addition of Ti into Fe-based alloy powder changes the morphology and microstructure of the coatings obviously. The equiaxed grains or dendritics appear instead of dendrite structures, and the microstructure becomes refined and uniform. In addition, with the increase of Ti content, the dilution rate of the coatings goes up and the size of crystal phase in the deposits becomes larger, which makes the hardness of high-doped layers decrease sharply. Meanwhile, the reasons for these differences are analyzed in detail. At last, by comparison, the Fe-based mixed with 1 wt.% Ti coating has the most desired performance. It has high hardness which is not sensitive to the scanning speed under the condition that the ratio of the powder feed rate to the scanning rate is constant. And the hardness distribution through the clad layers is much stable. (C) 2016 Elsevier B.V. All rights reserved.