WC含量对TiCN-HfN金属陶瓷刀具材料微观组织和力学性能的影响

宋金鹏; 于成功; 高姣姣; 吕明

doi:10.19591/j.cnki.cn11-1974/tf.2020030004

WC含量对TiCN-HfN金属陶瓷刀具材料微观组织和力学性能的影响

doi: 10.19591/j.cnki.cn11-1974/tf.2020030004

宋金鹏^{1, 2, ,},
于成功^{1, 2},
高姣姣^{1, 2},
吕明^{1, 2}

1.
太原理工大学机械与运载工程学院, 太原 030024
2.
太原理工大学精密加工山西省重点实验室, 太原 030024

基金项目:

国家自然科学基金资助项目 51875388

国家自然科学基金资助项目 51405326

详细信息

通讯作者:
宋金鹏, E-mail: songjinpeng@tyut.edu.cn

中图分类号: TB332;TG711
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出版历程
- 收稿日期: 2020-03-07
- 刊出日期: 2020-08-27

Effect of WC content on the microstructure and mechanical properties of TiCN-HfN cermet tool materials

SONG Jin-peng^{1, 2
, ,},
YU Cheng-gong^{1, 2},
GAO Jiao-jiao^{1, 2},
LÜ Ming^{1, 2}

1.
College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2.
Shanxi Key Laboratory of Precision Machining, Taiyuan University of Technology, Taiyuan 030024, China

More Information

Corresponding author: SONG Jin-peng, E-mail: songjinpeng@tyut.edu.cn

摘要

摘要: 采用热压烧结技术制备了TiCN-HfN-WC金属陶瓷刀具材料, 研究了WC含量(质量分数)对金属陶瓷刀具材料微观组织和力学性能的影响。结果表明: TiCN-HfN-32%WC金属陶瓷刀具材料由TiCN、(Ti, Hf, W)(C, N)、WC和MoNi组成, 材料中还含有极少量的(Ti, Mo, W)(C, N)固溶体, 材料内部形成了网状骨架结构。随着添加WC质量分数的增加, 材料中晶粒粒度降低, 添加WC可抑制材料中TiCN晶粒的生长, 起到细化TiCN晶粒的作用; 材料的相对密度、硬度和断裂韧度都具有先增大后减小的变化趋势, 材料的抗弯强度逐渐增大。当WC质量分数为32%时, 材料具有相对较好的综合力学性能, 其硬度为20.2GPa, 断裂韧度为7.1MPa·m^1/2, 抗弯强度为1581.3MPa。
- 金属陶瓷 /
- 刀具材料 /
- WC /
- 微观组织 /
- 力学性能
Abstract: TiCN-HfN-WC cermet tool materials were fabricated by hot-pressed sintering technology, and the effect of WC mass fraction on the microstructure and mechanical properties of the cermet tool materials was investigated. The results show that, the TiCN-HfN-32%WC cermets are composed of TiCN, (Ti, Hf, W)(C, N), WC, and MoNi, which also contain a little amount of (Ti, Mo, W)(C, N), and the retiform skeleton structure forms inside the cermet material. With the increase of the WC content, TiCN grain becomes smaller, which indicates that WC can inhibit the TiCN grain growth and achieve the refinement of TiCN grain; meanwhile, the density, hardness, and fracture toughness of the TiCN-HfN-WC cermet also increase first and then decrease, however, the flexural strength increases gradually. When the WC mass fraction is 32%, the TiCN-HfN-WC cermet shows good comprehensive mechanical properties: the hardness is 20.2 GPa, the fracture toughness is 7.1 MPa·m^1/2, and the flexural strength is 1581.3 MPa.
- cermet /
- tool materials /
- WC /
- microstructure /
- mechanical properties

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图 1 THW32试样X射线衍射图谱

Figure 1. XRD patterns of THW32

下载: 全尺寸图片幻灯片

图 2 THW32抛光面显微形貌及能谱分析：（a）显微形貌；（b）点A能谱；（c）点B能谱

Figure 2. Morphology and EDS analysis of the THW32polished surface: (a)SEM image; (b)EDS analysis of point A; (c)EDS analysis of point B

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图 3 THW试样断口形貌：(a)THW8;(b)THW16;(c)THW24;(d)THW32

Figure 3. Fracture morphologies of THW: (a)THW8;(b)THW16;(c)THW24;(d)THW32

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表 1 THW组成成分（质量分数）

Table 1. THW constituent %

试样	TiCN	WC	HfN	Ni	Mo
THW8	64	8	20	4	4
THW16	56	16	20	4	4
THW24	48	24	20	4	4
THW32	40	32	20	4	4

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表 2 THW相对密度和力学性能

Table 2. Relative density and mechanical properties of THW

试样	相对密度/%	维氏硬度/GPa	断裂韧度/(MPa·m^1/2)	抗弯强度/MPa
TH^[17]	99.6 ± 0.1	19.4 ± 0.2	8.5 ± 0.2	1235.9 ± 23.6
THW8	99.5 ± 0.2	19.2 ± 0.3	6.3 ± 0.2	1176.2 ± 31.2
THW16	99.6 ± 0.1	19.8 ± 0.2	6.7 ± 0.3	1264.5 ± 26.4
THW24	99.8 ± 0.1	20.6 ± 0.3	7.3 ± 0.2	1386.2 ± 34.9
THW32	99.7 ± 0.2	20.2 ± 0.3	7.1 ± 0.3	1581.3 ± 29.5

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