Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 25    No. 3    March 2015

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Microstructure and formation process of Ni-pool defect in WC-8Ni cemented carbides
Kai-hua SHI1, Ke-chao ZHOU1, Zhi-you LI1, Dou ZHANG1, Xiu-qi ZAN2

1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Zigong Cemented Carbide Corporation Limited, Zigong 643011, China

Abstract:The morphologies and formation process of Ni-pool defects in WC-8Ni cemented carbides were studied. The SEM images show that Ni-pool generally has two kinds of morphologies: “island” in isolation and “ring” around a new phase. In the obtained samples with “ring-like Ni-pool”, WC, Ni and Ni2W4C (η phase) phases were detected in XRD patterns. Combined with SEM, EDX and XRD results, it is found that the phase in the center of the “ring-like Ni-pool” is Ni2W4C (η phase) and the main chemical components of Ni-pool are Ni, W and C. In addition, the relationships among large size Ni (agglomerated) particles, volatile impurities, pores and carbon content vs forming process of the Ni-pool defects for WC-8Ni cemented carbides are also presented and discussed.

 

Key words: cemented carbide; WC-Ni alloy; microstructure; formation; defect

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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