氩弧重熔对20G钢渗硼层组织结构和耐磨性能的影响  

Influence of Argon Arc Remelting on Microstructure and Wear Resistance of Boronizing Coating on the Surface of 20G Steel

作　　者：赵霞[1] 朱艳[1] 徐家文[1] 

机构地区：[1]黑龙江科技学院材料科学与工程学院,黑龙江哈尔滨150027

出　　处：《材料保护》2011年第8期75-77,91,共3页Materials Protection

基　　金：黑龙江省教育厅科学技术研究项目(11553085)

摘　　要：为了降低渗硼层的脆性,提高其耐磨性,对20G钢渗硼层进行了氩弧重熔处理,研究了渗硼层重熔前后的形貌、相结构、显微硬度及耐磨性。结果表明:渗硼层由FeB和Fe2B两相组成,经氩弧重熔处理后FeB相消除,氩弧重熔渗硼层由Fe23(C,B)6和Fe2B相组成,包括氩弧重熔区和过渡区;氩弧重熔处理使渗硼层表层微观硬度降低,且使其表面至基体方向的硬度梯度变缓;氩弧重熔能明显改善渗硼层的耐磨性。The boronizing coating of 20G steel was treated by argon arc remelting so as to decrease the brittleness and increase wear resistance. The morphology, phase structure, microhardness and wear resistance of the boronizing coating before and after argon arc remelting were analyzed. Results indicate that the boronizing coating is composed of FeB and Fe2 B. After argon arc remelting, FeB phase disappeared, and argon arc remelted zone and transition zone were formed, while new phase Fe23 (C,B) 6 was generated along with Fe2B. In the meantime, argon arc remelting led to the decrease of surface hardness of the boronizing coating, flattening of the hardness gradient from the coating surface to the substrate, and significant improvement of wear resistance of the boronizing coating.

关 键 词：氩弧重熔 渗硼层 显微硬度 耐磨性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]