|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||Structural Evolution by Grain Refinement and Relaxation upon Heating of an Additive-manufactured 316L Stainless Steel
||Jae-Kyung Han, Xiaojing Liu, Yusuke Onuki, Yulia O. Kuzminova, Stanislav Evlashin, Klaus-Dieter Liss, Megumi Kawasaki
|On-Site Speaker (Planned)
In this report, structural evolution through nanostrcuturing is examined by a series of X-ray diffraction analysis and the structural relaxation behavior is examined by in-situ neutron diffraction under heating on the nanostructured additive-manufactured 316L stainless steel. Significant structural changes occur in a very early stage of nanostructuring and it is attributed to severe lattice distortion by the excess of dislocations and defects introduced by the post-printing processing. The sequential information on the structure evolution during in-situ neutron diffraction analysis upon heating provides the texture development, linear thermal lattice expansion, and stress relaxation behaviors of the nanocrystalline steel with increasing temperature up to 1300K, while these structural changes are in contrast to the steel without nanostructuring. Together with the hardness measurements after heating, the results of structural evolution are interpreted to describe microstructural recovery, recrystallization and grain growth behaviors and the thermal stability of the nanocrystalline stainless steel.
||Additive Manufacturing, Phase Transformations, Iron and Steel