Cr3C2含量对热压烧结WC基硬质合金材料微观组织和力学性能的影响

YUAN Yulan; LIU Hanlian; HUANG Chuanzhen; LIU Yang; WANG Limei; JI Lianggang

doi:10.19976/j.cnki.43-1448/TF.2022078

粉末冶金材料科学与工程 >

2023 , Vol. 28 >Issue 1: 55 - 62

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2022078

工艺技术

Cr₃C₂含量对热压烧结WC基硬质合金材料微观组织和力学性能的影响

YUAN Yulan ,
LIU Hanlian ,
HUANG Chuanzhen ,
LIU Yang ,
WANG Limei ,
JI Lianggang

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1.山东大学机械工程学院，济南 250061;
2.山东大学先进射流工程技术研究中心，高效清洁机械制造教育部重点实验室，济南 250061;
3.燕山大学机械工程学院，秦皇岛 066004

收稿日期: 2022-10-11

修回日期: 2022-12-09

网络出版日期: 2023-03-23

基金资助

国家自然科学基金资助项目(52075300,52275464); 河北省全职引进国家高层次创新型人才科研项目(2021HBQZYC XY004)

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Effects of Cr₃C₂content on microstructure and mechanical properties of hot-pressed sintered WC based cemented carbides

袁玉兰，刘含莲，黄传真，刘洋，王利梅，季良刚

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1. School of Mechanical Engineering, Shandong University, Jinan 250061, China;
2. Key Laboratory of High-efficiency and Clean Mechanical Manufacture, Ministry of Education, Center for Advanced Jet Engineering Technologies (CaJET), Shandong University, Jinan 250061, China;
3. School of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, China;

Received date: 2022-10-11

Revised date: 2022-12-09

Online published: 2023-03-23

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摘要

为了研制高强度高硬度的硬质合金刀具材料,本文采用真空热压烧结技术制备Cr₃C₂含量不同的WC基硬质合金。通过XRD、SEM、EDS等分析手段研究其物相组成及微观形貌,探究Cr₃C₂含量对WC基硬质合金力学性能和微观组织的影响规律。结果表明：在WC-Co硬质合金中添加适量Cr₃C₂可有效抑制WC晶粒异常长大,提高晶粒均匀度,减少微观组织缺陷,进而改善其综合力学性能。随Cr₃C₂含量增加,合金的硬度和抗弯强度先升高后降低,断裂韧性先降低后升高。当Cr₃C₂的质量分数为0.4%时,WC基硬质合金综合力学性能最佳,硬度(HV)达到20.97 GPa,抗弯强度为1 584 MPa,断裂韧性为10.92 MPa∙m^1/2,其中硬度大幅提高对于硬质合金材料用作切削刀具具有重要意义。

关键词： 硬质合金; 热压烧结; 力学性能; 微观组织; Cr₃C₂; WC

本文引用格式

YUAN Yulan , LIU Hanlian , HUANG Chuanzhen , LIU Yang , WANG Limei , JI Lianggang . Cr₃C₂含量对热压烧结WC基硬质合金材料微观组织和力学性能的影响[J]. 粉末冶金材料科学与工程, 2023 , 28(1) : 55 -62 . DOI: 10.19976/j.cnki.43-1448/TF.2022078

Abstract

In order to develop cemented carbide tool materials with high strength and high hardness, WC-based cemented carbides with different Cr₃C₂ contents were prepared by vacuum hot-pressed sintering technology. The phase compositions and microstructures of the WC-based cemented carbides were studied by XRD, SEM, and EDS. The effect of Cr₃C₂ content on the mechanical properties and microstructures of WC-based cemented carbide were investigated as well. The results show that appropriate amount of Cr₃C₂ can effectively inhibit the abnormal growth of WC grains, improve grain uniformity, reduce microstructure defects, and improve its comprehensive mechanical properties. With the increase of Cr₃C₂ content, the hardness and bending strength of the alloys increase firstly and then decrease, and the fracture toughness first decreases and then increases. When the mass fraction of Cr₃C₂ is 0.4%, the WC based cemented carbide has the best comprehensive mechanical properties, with the hardness (HV) of

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