稀土硅铁添加剂细化高铬铸铁堆焊合金  

Investigation into refinement of RE-Si-Fe on high chromium cast iron hardfacing alloy

作　　者：陈继刚[1] 周野飞[1,2] 姜永文 杨育林[1] 杨庆祥 

机构地区：[1]燕山大学机械工程学院,河北秦皇岛066004 [2]亚稳材料制备技术国家重点实验室,河北秦皇岛066004 [3]首钢技术研究院(技术中心)薄板研究所,北京100043

出　　处：《材料热处理学报》2014年第3期35-39,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51271163)

摘　　要：研究了稀土硅铁(RE-Si-Fe)添加剂对高铬铸铁堆焊合金组织的细化作用。采用光学显微镜对不同RE-Si-Fe加入量高铬铸铁堆焊合金的显微组织进行了观察;采用砂带式摩擦磨损试验机对其表面的耐磨性进行了评价,并采用扫描电镜对磨损形貌进行了观察;采用热力学计算和错配度计算分别讨论了Si和RE元素对高铬铸铁堆焊合金组织演变的影响。结果表明,RE-SiFe可以细化高铬铸铁堆焊合金的显微组织,提高其耐磨性。其原因为RE在堆焊冶金反应中生成的一系列稀土化合物,与M7C3型碳化物有良好的界面匹配,可以成为M7C3型碳化物的非均质化形核核心,细化了该碳化物。The microstructure refinement of the high chromium cast iron hardfacing alloy by additive RE-Si-Fe was investigated. The microstructure of the hardfacing alloys with different RE-Si-Fe addition contents were observed by optical microscope. The wear resistances of their surfaces were evaluated by abrasive belt type wear testing machine and the worn morphology was observed by scanning electron microscope （SEM）. The effects of elements RE and Si on microstructure evolutions of the alloys were discussed by thermodynamics calculation and lattice misfit calculation. The results show that the microstructure of the hardfacing alloy can be effectively refined and the wear resistance can be improved by the additive RE-Si-Fe. The reason is that, a series of RE-compounds can be formed during the hardfacing metallurgical reactions in the alloy, and the favorable interface matching between the RE-compounds and n7C3carbides exists, and the RE-compounds can be the inhomogeneous nucleus of MTC3carbides, so that MTC3 carbides can be refined.

关 键 词：组织细化 高铬铸铁 堆焊合金 稀土硅铁添加剂 

分 类 号：TG422.3[金属学及工艺—焊接]