Ni-WC表面合金化高锰钢组织的观察  

Microstructure Observation of Ni-WC Alloyed Surface Composites with Mn13 Cast Steel Matrix

作　　者：张贵才[1] 郭长庆[2] 程军[2] 王琦环[2] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103 [2]内蒙古科技大学科技中心,内蒙古包头014010

出　　处：《铸造技术》2010年第7期856-859,共4页Foundry Technology

摘　　要：以Ni-WC粉末为主要原料制成涂料,压成φ20 mm×5 mm的圆片,粘附在EPS泡沫塑料模样的一个表面上。采用V-EPC真空消失模铸造工艺浇注Mn13高锰钢钢液,从而制备出表面合金化高锰钢试样。1050℃水韧化处理后,运用光学显微镜、扫描电镜(SEM)和EDS观察和分析了高锰钢的显微组织。结果表明:高锰钢由表及里明显地由二个区域组成,即表面合金层区域和基体区域,中间过渡层不明显。在表面合金层中,Ni-WC颗粒已全部发生熔解,其组织由少量细小的类鱼骨状的富钨碳化物、大量的条块状碳化物和奥氏体组成,基体为单一奥氏体。在靠近表面合金层的基体区域中可以观察到晶粒内部和晶界上都有碳化物析出。EPS samples with φ20 mm × 5 mm disks that are mainly consisted of Ni-WC powders are prepared. The samples are then cast with Mn13 cast steel using V-EPC method, forming the Ni-WC alloyed surface composites with Mn13 cast steel matrix. After water quenching at 1 050 13, the microstructures are observed and analyzed using optical microscope, SEM and EDS. The results show that the composites from surface to core are obviously consisted of two different microstructural areas, the top alloyed surface layer and the matrix layer. There are no any Ni-WC particles existed in the alloyed surface layer and the microstructures in this layer are consisted of a small amount of fish-bone like fine W rich carbides, a large amount of interdendritic carbides and dendritic austenite. The transitional layer is not obvious. The matrix is consisted of only austenite. But small amounts of carbide particles within the matrix and net carbides in the grain boundaries can be observed near the alloyed surface layer in the matrix grains.

关 键 词：Ni-WC表面合金化 Mn13钢 V-EPC 组织观察 

分 类 号：TG174.4[金属学及工艺—金属表面处理]