<strong>WC-TiC-TaC-Co</strong>硬质合金中<strong>TaC</strong>含量对其显微组织和力学性能的影响

doi:10.11900/0412.1961.2019.00400

金属学报

2020, Vol. 56

Issue (7): 1015-1024 DOI: 10.11900/0412.1961.2019.00400

本期目录 | 过刊浏览

WC-TiC-TaC-Co硬质合金中TaC含量对其显微组织和力学性能的影响

和淑文¹, 王鸣华², 白琴¹(

), 夏爽¹, 周邦新¹

1.上海大学材料研究所上海 200072
2.宝山钢铁股份有限公司上海 201900

Effect of TaC Content on Microstructure and Mechanical Properties of WC-TiC-TaC-Co Cemented Carbide

HE Shuwen¹, WANG Minghua², BAI Qin¹(

), XIA Shuang¹, ZHOU Bangxin¹

1. Institute of Materials, Shanghai University, Shanghai 200072, China
2. Baoshan Iron & Steel Co. , Ltd. , Shanghai 201900, China

引用本文:

和淑文, 王鸣华, 白琴, 夏爽, 周邦新. WC-TiC-TaC-Co硬质合金中TaC含量对其显微组织和力学性能的影响[J]. 金属学报, 2020, 56(7): 1015-1024.
Shuwen HE, Minghua WANG, Qin BAI, Shuang XIA, Bangxin ZHOU. Effect of TaC Content on Microstructure and Mechanical Properties of WC-TiC-TaC-Co Cemented Carbide[J]. Acta Metall Sin, 2020, 56(7): 1015-1024.

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摘要:

利用SEM、EDS、三点弯曲装置及硬度计等手段研究了TaC含量对WC-TiC-TaC-Co硬质合金显微组织和力学性能的影响。结果表明，WC-TiC-TaC-Co硬质合金主要由3种相组成：WC相、(W, Ti, Ta)C相和γ相。随着TaC的质量分数从4.6%增加到7.3%，尺寸小于0.5 μm的WC晶粒比例增加；尺寸大于1 μm的复合碳化物(W, Ti, Ta)C晶粒比例增加，且均匀分散分布的(W, Ti, Ta)C开始聚集。合金的密度、硬度与断裂韧性均呈先下降后上升再下降的变化趋势；合金的抗弯强度呈先上升后下降的趋势。当TaC含量为6.3%时，合金的综合力学性能最佳：硬度、断裂韧性和抗弯强度分别为1749 HV₃₀、10.2 MPa·m^1/2和2247 MPa。

关键词 ：硬质合金, 晶粒尺寸, 力学性能

Abstract：

WC-Co cemented carbides, consisted of hard phase WC and ductile phase γ-phase, are usually prepared by a powder metallurgy and liquid phase sintering methodology. Due to the combined properties of high hardness and toughness, cemented carbides have high wear resistance and are widely used as machining, cutting, drilling, mining and forming tools. When the grain size of WC phase in WC-Co alloy is reduced to submicron, the hardness, toughness and strength of the material can be improved. TaC was considered as an effective additive of WC-Co based tools, for it made a great contribution to the enhancement of mechanical properties of WC-Co alloy. In this work, the effect of TaC on the microstructure and mechanical properties of WC-TiC-TaC-Co cemented carbide were investigated by means of SEM, EDS, three-point bending apparatus and hardness tester. The results show that WC-TiC-TaC-Co cemented carbide is mainly composed of three phases: WC phase, (W, Ti, Ta)C phase and γ phase. With the increase of TaC content from 4.6% (mass fraciton) to 7.3%, the proportion of WC grains with the size of less than 0.5 μm increases; the proportion of (W, Ti, Ta)C grains with the size of larger than 1 μm increases, and the (W, Ti, Ta)C grains begin to aggregate; the density of the alloy first decreases then increases and decreases, and the variation tendencies of hardness and fracture toughness are consistent with the density; the transverse rupture strength of the alloy first increases and then decreases. WC-TiC-TaC-Co cemented carbide with 6.3% TaC shows the best mechanical properties: the hardness, fracture toughness and transverse rupture strength are 1749 HV₃₀, 10.2 MPa·m^1/2and 2247 MPa, respectively.

Key words： cemented carbide grain size mechanical property

收稿日期: 2019-11-25

ZTFLH:

TG135

基金资助:国家自然科学基金项目(51671122);国家自然科学基金项目(51871144)

作者简介: 和淑文，女，1994年生，硕士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00400 或 https://www.ams.org.cn/CN/Y2020/V56/I7/1015

表1 WC-TiC-TaC-Co硬质合金成分 (mass fraction / %)

图1 三点弯曲装置示意图(俯视图)

图2 WC-TiC-TaC-Co硬质合金的SEM-BSE像

表2 图2a中各点EDS结果 (mass fraction / %)

图3 WC-TiC-TaC-Co硬质合金中WC和(W, Ti, Ta)C晶粒尺寸分布图

图4 TaC含量对WC-TiC-TaC-Co硬质合金的密度和硬度的影响

图5 TaC含量对WC-TiC-TaC-Co硬质合金断裂韧性的影响

图6 WC-TiC-TaC-Co硬质合金裂纹形貌

图7 WC-TiC-TaC-Co硬质合金中WC晶粒取向分布图

图8 TaC含量对WC-TiC-TaC-Co硬质合金抗弯强度的影响

图9 WC-TiC-TaC-Co硬质合金断口形貌

图10 WC-TiC-TaC-Co硬质合金的断口形貌放大图

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