Effect of WC/W_2C on the microstructure and abrasion resistance of high-boron hardfacing alloys  

作　　者：Jianxun GONG Tianshun TANG Yifeng XIAO 

机构地区：[1]School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China

出　　处：《Acta Metallurgica Sinica(English Letters)》2010年第6期439-445,共7页金属学报（英文版）

基　　金：supported by the Natural Science Foundation of Hunan Province,China(No.10JJ6078)

摘　　要：High boron hardfacing alloys reinforced with primary M2B phases on Q235 steel plates were prepared by the method of flux-cored wire submerged arc welding. The microstructure and boride morphology were investigated using optical microscopy （OM）, scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The effect of WC/W2C on the microstructure was discussed. It indicated that the volume fraction of primary M2B phases has increased due to good nucleated cores of incompletely molten W2C particles provided by casting tungsten carbide or decarburizing reaction of WC powders. Abrasion resistance was evaluated by wet sand rubber wear tests and the wear mechanism was studied using SEM. It shows that primary M2B grains play a key role in improving abrasion resistance.High boron hardfacing alloys reinforced with primary M2B phases on Q235 steel plates were prepared by the method of flux-cored wire submerged arc welding. The microstructure and boride morphology were investigated using optical microscopy （OM）, scanning electron microscopy （SEM） and X-ray diffraction （XRD）. The effect of WC/W2C on the microstructure was discussed. It indicated that the volume fraction of primary M2B phases has increased due to good nucleated cores of incompletely molten W2C particles provided by casting tungsten carbide or decarburizing reaction of WC powders. Abrasion resistance was evaluated by wet sand rubber wear tests and the wear mechanism was studied using SEM. It shows that primary M2B grains play a key role in improving abrasion resistance.

关 键 词：Primary M2B phases Abrasion resistance MICROSTRUCTURE Submerged arc welding 

分 类 号：TG156.87[金属学及工艺—热处理] TH117.1[金属学及工艺—金属学]