期刊
ACTA MATERIALIA
卷 59, 期 11, 页码 4719-4731出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2011.04.019
关键词
Cemented tungsten carbide; Functionally graded material (FGM); Kinetic analysis; Carbon diffusion
资金
- Center of Excellence of the State of Utah Governor's Office of Economic Development
Cemented tungsten carbide (WC-Co) with a cobalt content gradient from the surface to the bulk of a sintered piece is an example of a functionally graded material, the mechanical properties of which are optimized by the unique gradient microstructure, giving rise to superior combinations of wear resistance vs. fracture toughness. A process for creating such cobalt gradients in WC-Co was developed recently based on heat treatments of fully sintered WC-Co materials in carburizing atmospheres. A study of the kinetics of the process is necessary to fully understand the mechanisms of the process in order to achieve desired or designed gradients. In this paper, a series of carburizing experiments were conducted to examine the effects of key process parameters including temperature, composition of the atmosphere, and time on the overall kinetics of the process. A kinetic model was established to predict the thickness of the gradient as a function of these process variables, enabling the design of functionally graded WC-Co through controlling atmosphere and time. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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