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Characterization of microstructure and residual stress in a 3D H13 tool steel component produced by additive manufacturing

Published online by Cambridge University Press:  19 August 2014

Ryan Cottam ,
James Wang  and
Vladimir Luzin
Ryan Cottam*
Affiliation:
Industrial Laser Applications Laboratory, IRIS, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Victoria 3122, Australia
James Wang
Affiliation:
Industrial Laser Applications Laboratory, IRIS, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Victoria 3122, Australia
Vladimir Luzin
Affiliation:
Bragg Institute, Australian Nuclear Science and Technology Organisation, Lucas Heights, New South Wales 2232, Australia
*
a)Address all correspondence to this author. e-mail: rcottam@swin.edu.au
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Abstract

H13 tool steel was deposited using the additive manufacturing technique Direct Metal Deposition to produce a part having a wedge geometry. The wedge was characterized both in terms of microstructure and residual stress. It was found that phase transformations were significantly influencing the microstructure, which was then linked to the residual stress distribution as seen in Fig. 8. The residual stress distribution was found to be opposite to that reported in the literature. This was attributed to the low temperature martensitic phase transformation of the H13 tool steel and the subsequent tempering of the microstructure with an increasing number of layers of deposited material. The high hardness and compressive residual stress of the top 4 mm of the wedge are ideal in die casting and forging dies, as it will resist thermal fatigue. It also has a hardness higher than that produced by typical heat treatment processes.

Keywords

steelneutron scatteringmicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 17: Focus Issue: The Materials Science of Additive Manufacturing , 14 September 2014 , pp. 1978 - 1986
Copyright
Copyright © Materials Research Society 2014 

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