| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Innovative Process Design and Processing for Advanced Structural Materials
|
| Presentation Title |
Structural Evolution during Nanostructuring and Heating of an Additive-manufactured Stainless Steel Examined by X-ray and In-situ Neutron Diffraction Analyses |
| Author(s) |
Megumi Kawasaki, Jae-Kyung Han, Xiaojing Liu, Yusuke Onuki, Yulia O. Kuzminova, Stanislav A. Evlashin, Klaus-Dieter Liss |
| On-Site Speaker (Planned) |
Megumi Kawasaki |
| Abstract Scope |
Structural evolution through nanostrcuturing and relaxation upon heating are examined by X-ray diffraction and in-situ heating neutron diffraction analyses, respectively, on an additive-manufactured (AM) 316L stainless steel. Significant structural changes occur in a very early stage of nanostructuring through the application of high-pressure torsion leading to severe lattice distortion by the excess of dislocations and defects. The sequential information on the structure relaxation during in-situ heating neutron diffraction analysis 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 contrast with the HEA 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. Moreover, the similarity of the recrystallization behavior will be shown in an AM CoCrFeNi high-entropy alloy. |