NDLI: Microstructural investigations of XW-42 and M2 tool steels in semi-solid zones via direct partial remelting route

Content Provider	Springer Nature Link
Author	Omar, M. Z. Alfan, A. Syarif, J. Atkinson, H. V.
Copyright Year	2011
Abstract	A suitable microstructure for thixoforming consists of spheroidal grains in a liquid matrix. In order to achieve this, some processing routes have been established. In this study, microstructural evolution of XW-42 and AISI M2 steels via direct partial remelting from the as-annealed condition was examined. Both steels were found to possess certain types of carbides that dissolved when subjected to heating inside the semi-solid zones. The types of carbides were MC-M$_{6}$C for AISI M2 steel (fully dissolved between 1280 and 1300 °C) and M$_{7}$C$_{3}$ for XW-42 steel (fully dissolved between 1250 and 1270 °C). The dissolution of these grain boundary carbides during partial remelting helps with the grain spheroidisation and also with providing grain lubrication for the forming process through solid–liquid particle contact. In addition, solid–solid contacts were also observed (in 2D as well as 3D microstructural observation) and considered useful to provide structural integrity prior to forming. However, these contacts also must also be weak enough to be sheared easily. Compression test results for AISI M2 steel showed that thixotropic behaviour and complete mould filling were observed starting from 35 liquid percent. The same behaviour is also expected to occur for XW-42 steel due to its similarity in microstructural evolution with AISI M2 steel.
Starting Page	7696
Ending Page	7705
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	46
Issue Number	24
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2011-07-07
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Mechanics Crystallography Polymer Sciences Characterization and Evaluation of Materials Continuum Mechanics and Mechanics of Materials Materials Science
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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