Effect of pulse current on microstructure and wear resistance of Stellite6/tungsten carbide claddings produced by tungsten inert gas process
Effect of pulse current on microstructure and wear resistance of Stellite6/tungsten carbide claddings produced by tungsten inert gas process
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DOI：
10.1016/j.surfcoat.2011.03.076
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发表时间：
2011-05-25
影响因子：
5.4
通讯作者：
Ashrafizadeh, F.
中科院分区：
文献类型：
--
作者：
Madadi, F.;Shamanian, M.;Ashrafizadeh, F.
本文采用脉冲和恒流两种方式进行钨极惰性气体保护焊（TIG）堆焊，制备了钨铬钴合金/碳化钨复合材料熔覆层。对熔覆层的相组成、显微组织、硬度和磨损性能进行了研究。结果表明，熔覆层组织为γ +（γ + WC）亚共晶组织。加入的WC完全熔化到熔池中，再凝固组织含有α-Co、σ-CoCr和某些类型的碳化物。结果表明，脉冲电流的使用导致稀释减少，并形成具有更高硬度的更细的显微组织。几个显着不同的凝固微观结构的特点是树枝晶，共晶和刻面枝晶的包层。小面枝晶含有大部分W以及Cr和Co，而基体具有较高的Cr和Co含量。小面枝晶的存在改善了涂层的磨损性能，随着WC含量的增加，获得了更多的小面枝晶。(C)2011爱思唯尔有限公司版权所有。
In this paper, the tungsten inert gas (TIG) surfacing process was carried out in two, pulse and constant current modes to produce Stellite/WC composite claddings. To evaluate the coating, phase composition, microstructure, hardness and wear behavior of the clad layers were investigated. The results showed that the microstructure of the cladding was composed of a hypoeutectic structure (gamma + (gamma + WC)). The added WC was completely melted into the weld pool and the resolidified structure contained alpha-Co, sigma-CoCr and some types of carbides. It was indicated that the use of pulsed current leads to a decrease in dilution and formation of a finer microstructure having higher hardness. Several significantly different solidified microstructures were characterized by dendrites, eutectics and faceted dendrites in the claddings. The faceted dendrites contained the majority of W as well as Cr and Co while the matrix had higher Cr and Co content. The presence of faceted dendrites caused improvement in wear behavior of claddings, with more WC content introduced, more faceted dendrites was obtained. (C) 2011 Elsevier B.V. All rights reserved.