316L stainless steel designed to withstand intermediate temperature
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AM Stainless Steel

Published: 7 March 2018

High Temperature Characterization of Additive Manufactured Stainless Steel

The high cooling rate and asymmetric thermal gradients introduced into processed alloys (stainless steel, 316L, 2507 and 420 grades) via Selective laser melting (SLM) can effectively tailor the microstructure, tune the chemistry and improve the mechanical performance of steels. However the non-equilibrium microstructure and composition of SLM processed steels can affect the service application of these steels under high temperature and tension. Thermo-mechanical treatment can illustrate and study the effect of heat treatment on Chemical, microstructural, physical stability and mechanical performance of steel materials.

My research focuses on enhancement and tailoring of pre additively manufactured alloys (steel grades 316L, 2507 and 420) using Gleeble 3800 thermo-mechanical simulator for increasing the service temperature and expanding the application fields of these alloys after which I carry out  detailed analysis correlating the mechanical performance with microstructure and materials chemistry.

In one project 316L stainless steel capable of withstanding 800°C temperature under tension and temperature with over 400 MPa total strength and 20% elongation was designed and developed and the microstructure and chemical stability was studied. Fig.1 shows the mechanical performance of 316L at 800C temperature and related microstructure respectively. In another project a new growth mechanism in 316L stainless steel was reported which prevents abnormal grain growth up to temperatures as high as 1100°C. Currently undergoing is studying the mechanical behavior of formation of strong and hard duplex stainless steels with high concentration of micro constituents and intermetallic sigma phase after heat treatment at high temperatures (900°C and 1200°C).

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