摘要
采用水冷结晶器快速冷却凝固W6Mo5Cr4V2高速钢熔体与电磁感应加热35Cr Mo低合金锻钢芯棒相结合的方法制备了复合轧辊,研究了复合轧辊经过退火处理后的复合界面的组织特征和硬度变化。运用光学显微镜和扫描电镜分析了复合界面的组织形貌,并检测了界面两侧的硬度变化。结果表明：复合界面组织由W6Mo5Cr4V2高速钢层、扩散层和35Cr Mo低合金钢辊芯层三层组成。高速钢层由珠光体＋粗大的网状碳化物和粒状晶内碳化物组成;扩散层由细珠光体和晶界碳化物组成。从高速钢层一侧向辊芯层一侧的扩散层组织中网状碳化物逐渐断网、变细和减少;辊芯层组织由珠光体＋铁素体组成;复合界面的宽度约为0.8-1 mm,界面两侧合金元素扩散迹象明显;硬度在界面两侧落差大,但在扩散层内变化较为缓和。复合界面的组织特征和硬度变化结果表明：复合轧辊的形成是辊芯表面熔化与随后合金元素扩散综合作用的结果。
This paper introduces the annealed microstructure characteristics and hardness variation of the high speed steel roll composite interface, which is produced by the combination of the W6Mo5Cr4V2 high-speed steel melt with a 35CrMo low-alloy forged steel rod using electromagnetic induction. The microstructure of the composite interface is observed by optical microscopy and scanning electron microscopy, and the hardness variation within the interface is tested. The results show that the composite interface consists of three layers, the W6Mo5Cr4V2 high-speed steel layer, the diffusion layer and the 35CrMo low-alloy steel layer. The microstructure of the high-speed steel layer consists of pearlite, coarse mesh carbide and granular interior carbide, and the diffusion layer of fine pearlite and carbides at grain boundary. The carbides within the diffusion layer from the side of the high-speed steel layer to the side of the low-alloy steel layer gradually break their network, become thinning and reduce in the amount. The microstructure of the 35CrMo low-alloy steel layer is composed ofpearlite and ferrite. The width of the composite interface is about 0.8-1 ram. The diffusion of alloy elements from both sides of the composite interface is obvious. The variation of hardness from one side to another within the composite interface is remarkable. However, this variation in the diffusion layer is insignificant. The changes in microstructure characteristics and hardness of the composite interface show that the formation of the composite roll is the result of the combined effect of the surface melting of the 35CrMo low-alloy forged steel rod and the diffusion of the alloying elements both from the W6Mo5Cr4V2 high-speed steel and the forged steel rod.
出处
《铸造》
CAS
CSCD
北大核心
2016年第2期115-118,共4页
Foundry
