Abstract
Selective laser melting (SLM) is a very promising near net shape approach to manufacture metallic complex-shaped parts. However, it is highly challenging to manufacture ultrahigh strength medium-carbon steels via SLM due to the cracking and low ductility issues. In this contribution, the mechanisms of crack and limited ductility in the conventional medium-carbon H13 steels by SLM were investigated, which was likely attributed to the poor stability of retained austenite (RA) and the resultant formation of brittle fresh martensite. A modified crack-free H13 steel for SLM was successfully additively manufactured via in-situ minor alloying of 316 L powders, leading to the substantially enhanced austenite stability with heterogeneity. The modified SLM-fabricated H13 steel exhibited an ultrahigh tensile strength (UTS) of ∼2.0 GPa with a fractured elongation of ∼19%. This work demonstrates the critical role of austenite stability in cracking behavior and ductility of the SLM-fabricated medium-carbon steels.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
