期刊
ACTA MATERIALIA
卷 54, 期 10, 页码 2727-2734出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2006.02.021
关键词
semi-solid processing; tool steel; tempering; phase transformation; wear
Because of their great hardness and wear resistance, hypoeutectic ledeburitic chromium steels are widely used for machining and measuring tools. Such steels are normally shaped by chipping procedures, and subsequently hardened and tempered. Here we describe the structure and property evolution when an alternative shaping method, net-shape forming in the semi-solid state, is applied. The structure of the material in the as-formed, fast-cooled untempered condition is relatively soft and is characterized by a nonmagnetic dual-phase mixture of primary metastable austenite and M7C3-carbide/austenite eutectic. Reduced cooling rates or isothermal aging result in complex multiphase microstructures with great hardness (up to 800 HV10) and wear resistance. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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