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Preparation and mechanical properties of selective laser melted H13 steel

Published online by Cambridge University Press:  13 February 2019

Bo Ren Open the ORCID record for Bo Ren [Opens in a new window] ,
Dehong Lu ,
Rong Zhou ,
Zhenhua Li  and
Jieren Guan
Bo Ren
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Dehong Lu*
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Rong Zhou
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Zhenhua Li
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
Jieren Guan
Affiliation:
Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Process parameters (laser power and scanning speed) for H13 steel specimens produced by selective laser melting (SLM) are optimized, and microstructural characteristics and mechanical properties are investigated. The optimum process parameters are a laser power of 170 W and a scanning speed of 400 mm/s according to the maximum relative density of 99.2%. The microstructure consists of cellular grains and columnar crystal, which are composed of lath martensite and retained austenite, and there are no carbides or other second-phase particles present. The size of cellular grains is 1 μm. Compared with the common processed (forged and heat-treated) H13, SLM H13 has similar microhardness (561 HV) and tensile strength (1909 MPa) values. However, the elongation (12.4%) is a factor of ∼3 times higher and the impact energy (14.4 J) of the SLM specimen is somewhat lower. The relationship between the microstructure and mechanical properties is discussed. Fine grains and no second-phase precipitation determine the strength and plasticity of SLM samples.

Keywords

H13 steelselective laser meltingrelative densitymicrostructuretensile strengthenimpact toughness
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 8 , 29 April 2019 , pp. 1415 - 1425
Copyright
Copyright © Materials Research Society 2019 

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