摘要
通过SEM和TEM对目前市售的美国著名的高碳Cr-Mo-W高硬度耐磨堆焊层和自行设计的高碳Nb-Ti-V堆焊层进行了研究.研究表明:高碳Cr-Mo-W堆焊层基体组织为孪晶马氏体,内含微裂纹,碳化物沿晶界呈网状分布;高碳Nb-Ti-V堆焊层基体组织为束状板条马氏体,碳化物硬质点呈颗粒状弥散分布,这不仅使堆焊层达到较高的硬度,而且使其基体属低硬度高塑性,抗裂性大大提高.通过对高碳Nb-Ti-V急冷熔滴的研究,探讨了产生此效果的机理.
The microstructure of the commercial American famous MG700 high-hardness and wear-resistance surfaced layer with high-carbon Cr-Mo-W and the self-designed surfaced layer with high-carbon Nb-Ti-V was investigated by SEM and TEM. The results indicate that the high-carbon Cr-Mo-W surfaced layer is composed of twin-crystal martensite with lots of micro-cracks and the like-net carbides precipitate along cylindrical-crystal boundaries; the high-carbon Nb-Ti-V surfaced layer is made up of lath martensite and the like-granule carbides evenly scattered in the crystal grains, which makes the surfaced layer get higher hardness, better toughness and crack-resistance. The forming mechanism of such a specific effect was discussed by investigating the extremely quick-cool droplet of the high-carbon Nb-Ti-V surfacing electrode.
出处
《材料科学与工艺》
EI
CAS
CSCD
2004年第3期275-278,共4页
Materials Science and Technology
基金
山东省自然科学基金资助项目(Y99F01).
