QUANTITATIVE RELATIONSHIPS BETWEEN MICROSTRUCTURE PARAMETERS AND MECHANICAL PROPERTIES OF ULTRAFINE CEMENTED CARBIDES

doi:10.3724/SP.J.1037.2011.00262

Acta Metall Sin

2011, Vol. 47

Issue (9): 1188-1194 DOI: 10.3724/SP.J.1037.2011.00262

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QUANTITATIVE RELATIONSHIPS BETWEEN MICROSTRUCTURE PARAMETERS AND MECHANICAL PROPERTIES OF ULTRAFINE CEMENTED CARBIDES

ZHAO Shixian, SONG Xiaoyan, LIU Xuemei, WEI Chongbin, WANG Haibin, GAO Yang

Key Laboratory of Advanced Functional Materials, College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124

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ZHAO Shixian SONG Xiaoyan LIU Xuemei WEI Chongbin WANG Haibin GAO Yang. QUANTITATIVE RELATIONSHIPS BETWEEN MICROSTRUCTURE PARAMETERS AND MECHANICAL PROPERTIES OF ULTRAFINE CEMENTED CARBIDES. Acta Metall Sin, 2011, 47(9): 1188-1194.

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Abstract The microstructures of ultrafine WC-Co cemented carbides were characterized and analyzed by stereological methods. The quantitative relationships between the mechanical properties and microstructure parameters, such as the mean grain size d_WC, mean free path L_Co and contiguity C_WC-WC, were obtained. The calculated results of mechanical properties agree well with the experimental measurements. With the equivalent contiguity, the Vickers hardness of ultrafine cemented carbides has linear relationships with d_WC^-1/2 and L_Co^-1/2 and the fracture toughness K_IC has deterministic relationships with d_WC^-1/2 and L_Co^-1/2, respectively. With certain Co content and mean grain size, the transverse rupture strength decreases with the increase of contiguity. Especially when the contiguity is above 0.5, the strength decreases obviously. The present results may be used as criteria to optimize the microstructure and to improve mechanical properties of ultrafine cemented carbides.

Key words: ultrafine cemented carbide stereological characterization microstructure parameter mechanical property

Received: 25 April 2011

ZTFLH:

TB125.3

Fund:

Supported by Special Preliminary Study Item of National Basic Research Program of China (No.2011CB612207), Beijing Natural Science Foundation (No.2112006) and Fund of State Key Laboratory of Powder Metallurgy of Central South University

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	DIAO Shi-Xian
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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00262 OR https://www.ams.org.cn/EN/Y2011/V47/I9/1188

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