Combination of cryogenic and pulsed electric field treatment for enhanced microstructure and mechanical properties of WC–Co cemented carbides

IF 11 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Rare Metals Pub Date : 2025-02-03 DOI:10.1007/s12598-024-03161-2

Ming-Yuan Ma, Song-Han Hu, Ying-Chun Diao, Kai Wang, Guo-Jian Li, Wang-Zhong Mu, Qiang Wang

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Abstract

In this work, we aim to develop a novel post-treatment process combining cryogenic and pulsed electric field treatment to enhance WC–Co cemented carbides. The results show a 15.62% increase in hardness from 1831.38 to 2117.38 HV₃₀, a 9.60% rise in fracture toughness from 9.06 to 9.93 MPa·m^1/2, while the friction coefficient decreases from 0.63 to 0.47. Through the residual stress evolution, WC orientation change and the martensitic transformation of Co, and the internal enhancement mechanism of cryogenic combined with pulsed electric field treatment are revealed. The electron wind generated by the pulsed electric field can efficiently reduce the residual stress induced by cryogenic process. The evolution of residual stress promotes the base slip of WC, increasing the degree of {0001} orientation. In addition, the degree of martensitic transformation of Co intensifies, with the hcp-Co/fcc-Co ratio rising from 0.41% to 17.86%. The enhanced WC {0001} orientation and increased hcp-Co content contribute to significant improvements in hardness and wear resistance. This work provides a novel efficient enhancement strategy for ceramics and alloys, with the potential to be a mainstream strengthening method in the future.

Graphical Abstract

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结合低温和脉冲电场处理增强 WC-Co 硬质合金的微观结构和机械性能

在这项工作中，我们的目标是开发一种结合低温和脉冲电场处理的新型后处理工艺来增强WC-Co硬质合金。结果表明：硬度从1831.38 HV30提高到2117.38 HV30，提高了15.62%；断裂韧性从9.06 MPa·m1/2提高到9.93 MPa·m1/2，提高了9.60%；摩擦系数从0.63降低到0.47；通过残余应力演化、WC取向变化和Co的马氏体相变，揭示了低温联合脉冲电场处理的内部强化机理。脉冲电场产生的电子风可以有效地降低低温过程中产生的残余应力。残余应力的演化促进了WC的基底滑移，增加了{0001}取向程度。Co的马氏体相变程度增强，hcp-Co/fcc-Co比值从0.41%上升到17.86%。WC{0001}取向的增强和hcp-Co含量的增加有助于硬度和耐磨性的显著提高。这项工作为陶瓷和合金提供了一种新的高效强化策略，有可能成为未来主流的强化方法。图形抽象

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.