Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 449, Issue -, Pages 809-812Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.01.162
Keywords
deep cold; tool steels; epsilon-carbides
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It is well known that the wear resistance of tools can be improved using deep cold treatment to produce nucleation sites for the nano-sized carbides that form in the martensite during low temperature tempering following the extended treatment times. However, inconsistencies in the processing techniques used, particularly the soaking time at very low temperature and the steel's previous thermal history, have led to different conclusions as to the exact mechanisms involved. This paper reviews current thinking and attempts to explain the different results obtained in terms of the processing parameters and to elucidate the implications for the practical application of the technique to obtain optimum properties. An optimised process route using liquid nitrogen as the coolant is recommended and a possible technique to make further improvements in the process is suggested. (c) 2006 Elsevier B.V. All rights reserved.
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