WC硬质合金强韧化的研究进展与展望

doi:10.3901/JME.2021.14.195

摘要/Abstract

摘要： WC硬质合金具有本质脆性，引入添加剂可以实现强度和韧性的同步提升，添加剂种类繁多且不同的添加剂表现出不同的强韧化机制，但目前缺乏对添加剂增强增韧金属粘结相WC硬质合金较为系统的综述。基于不同种类的添加剂，从硬质合金的组成、微观结构和烧结技术等方面综述了国内外对WC硬质合金强韧化的研究进展。着重介绍各种添加剂及其复合添加时的增强增韧机制，主要表现为细晶强韧化、位错强韧化、相变增韧、裂纹的偏转、桥接和分叉等。总结和对比采用不同金属粘结相和添加剂制备的WC硬质合金的强韧性所能达到的范围，指出目前研究中亟待解决的问题及未来发展趋势。通过对大量研究工作的系统整合，在WC硬质合金的组成和性能上建立联系，从而为工业生产提供参考，使行业根据所需的性能指标和服役条件，有目的地选择合适的配比，设计制造出符合要求的产品。

关键词: WC硬质合金, 强韧化, 添加剂

Abstract: Due to the intrinsic brittleness of WC cemented carbides, additives are introduced to enhance strength and toughness simultaneously. There are a wide variety of additive and different additives show different strengthening and toughening mechanisms. However, at present, there is a lack of a more systematic review that strengthen and toughen WC cemented carbides with metal binder by the use of additives. Based on the classification of additives, the research progress on strengthening and toughening WC cemented carbides is reviewed from the aspects of composition, microstructure and sintering technology. The strengthening and toughening mechanisms of various additives and their co-doping are introduced, which mainly include fine grain strengthening-toughening, dislocation strengthening-toughening, phase transition toughening, crack deflection, bridge and branching, etc. The range of strength-toughness of WC cemented carbides prepared with different metal binders and additives are summarized and compared, pointing out the problems to be solved in the present research and the development trend in the future. Through the systematic integration of a great deal of research work, the composition and performance of WC cemented carbide are established, so as to provide reference for industrial production. Consequently, according to the required performance indicators and service conditions, the industry can purposefully choose the appropriate ratio, therefore design and manufacture the products meeting the requirements.

Key words: WC cemented carbide, strengthening and toughening, additive

中图分类号:

TG135

邹芹, 张萌蕾, 李艳国, 罗永安. WC硬质合金强韧化的研究进展与展望[J]. 机械工程学报, 2021, 57(14): 195-204,212.

ZOU Qin, ZHANG Menglei, LI Yanguo, LUO Yongan. Research Progress and Prospect of Strengthening and Toughening WC Cemented Carbides[J]. Journal of Mechanical Engineering, 2021, 57(14): 195-204,212.

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