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.
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