Fabrication of Functionally Graded WC-Co Cemented Carbides with Plate-Like WC Grains

被引：3

作者：

Ke, Zheng ^{[1
]}

Zheng, Yong ^{[1
]}

Gao, Lu ^{[1
]}

Zhou, Wei ^{[1
]}

Zhang, Jiajie ^{[1
]}

Zhang, Guotao ^{[1
]}

Zhu, Xinggen ^{[2
]}

机构：

[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Jiangsu, Peoples R China

[2] Changshu Xunda Powder Met Co Ltd, Suzhou 215552, Jiangsu, Peoples R China

来源：

POWDER METALLURGY AND METAL CERAMICS | 2019年 / 58卷 / 7-8期

关键词：

functionally graded cemented carbides; plate-like WC grains; carburizing; mechanical properties; COBALT-GRADIENT;

D O I：

10.1007/s11106-019-00096-7

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Functionally graded WC-Co cemented carbides (FG WC-Co) with plate-like WC grains were fabricated by carburizing of cemented carbides with no eta phase. The phase composition and microstructure of FG WC-Co were investigated by XRD, SEM and EDX. The results showed that a cobalt-deficient layer was formed due to difference in affinity among carbon and other alloying elements. WC grain size increased while the ratio of side length to thickness decreased slightly in the surface zone due to difference of growth rate between different planes of WC grains. Moreover, FG WC-Co possessed an 80 mu m deep cobalt-deficient layer, and showed excellent mechanical properties with a surface hardness of 1748 HV and fracture toughness of 9.6 MPa center dot m(1/2) in the surface zone.

引用

页码：463 / 468

页数：6

共 15 条

[1] Synthesis and processing of nanocrystalline tungsten carbide Towards cemented carbides with optimal mechanical properties
Bonache, V.
Salvador, M. D.
Busquets, D.
Burguete, P.
Martinez, E.
Sapina, F.
Sanchez, E.
[J]. INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, 2011, 29 (01) : 78 - 84
[2] Design of cobalt gradient via controlling carbon content and WC grain size in liquid-phase-sintered WC-Co composite
Fan, Peng
Guo, Jun
Fang, Zhigang Zak
Prichard, Paul
[J]. INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS, 2009, 27 (02) : 256 - 260
[3] Fang Z.Z., 2011, United States Patent, Patent No. [US20110116963A1, 20110116963]
[4] Fischer UKR, 1988, US Patent, Patent No. [4,743,515, 4743515]
[5] Guo J, 2011, INT J POWDER METALL, V47, P55
[6] Kinoshita S., 2000, J. Jpn. Soc. Powder Powder Metall, V47, P526, DOI [10.2497/jjspm.47.526, DOI 10.2497/JJSPM.47.526]
[7] Strengthening zones in the Co matrix of WC-Co cemented carbides
Konyashin, I.
Lachmann, F.
Ries, B.
Mazilkin, A. A.
Straumal, B. B.
Kuebel, Chr.
Llanes, L.
Baretzky, B.
[J]. SCRIPTA MATERIALIA, 2014, 83 : 17 - 20
[8] A novel sintering technique for fabrication of functionally gradient WC-Co cemented carbides
Konyashin, I.
Ries, B.
Lachmann, F.
Fry, A. T.
[J]. JOURNAL OF MATERIALS SCIENCE, 2012, 47 (20) : 7072 - 7084
[9] Formation mechanism of cobalt-gradient structure in WC-Co hard alloy
Liu, Y
Wang, HB
Yang, JG
Huang, BY
Long, ZY
[J]. JOURNAL OF MATERIALS SCIENCE, 2004, 39 (13) : 4397 - 4399
[10] Functionally graded WC-Co materials produced by electrophoretic deposition
Put, S
Vleugels, J
Van der Biest, O
[J]. SCRIPTA MATERIALIA, 2001, 45 (10) : 1139 - 1145

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