|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Ultrafine-grained and Heterostructured Materials (UFGH XII)
||Effect of Nanostructuring in Additive-manufactured 316L Stainless Steel on Structural Relaxation Examined by In-situ Heating Neutron Diffraction Analysis
||Jae-Kyung Han, Xiaojing Liu, Yusuke Onuki, Yulia O. Kuzminova, Stanislav A. Evlashin, Klaus-Dieter Liss, Megumi Kawasaki
|On-Site Speaker (Planned)
The present report describes the structural changes and relaxation upon heating in an additive-manufactured 316L stainless steel examined by in-situ heating neutron diffraction analysis after nanostructuring by high-pressure torsion. The nanostructured austenitic steel with an average grain size of 60 nm improves the Vickers microhardness to HV = 500 which is twice higher than the as-printed sample. The in-situ examination provides linear thermal lattice expansion and stress relaxation of the material during heating. Together with ex-situ hardness testing, the structural relaxation behaviors upon heating of the austenitic steel are observed in a sequence of (i) recovery with slow strain relaxation up to 873K, (ii) recrystallization with accelerated strain relaxation at 873-973K, and (iii) grain growth above 973K with completing strain relaxation in lattices up to 1023K. The present in-situ heating neutron diffraction analysis successfully visualizes the sequential structural evolution in the additive-manufactured 316L stainless steel on time and temperature scales.
||Additive Manufacturing, Iron and Steel, Mechanical Properties