0525105 - ÚFM 2021 RIV CH eng J - Journal Article
Král, Petr - Dvořák, Jiří - Sklenička, Václav - Horita, Z. - Takizawa, Y. - Tang, Y. - Kvapilová, Marie - Svobodová, M.
Effect of ultrafine-grained microstructure on creep behaviour in 304L austenitic steel.
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 785, MAY (2020), č. článku 139383. ISSN 0921-5093. E-ISSN 1873-4936
R&D Projects: GA ČR(CZ) GA19-18725S
Institutional support: RVO:68081723
Keywords : Creep-resistant steels * Ultrafine-grained materials * Creep behaviour * Microstructure
OECD category: Materials engineering
Impact factor: 5.234, year: 2020
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0921509320304640?via%3Dihub

The austenitic stainless steel 304 L was subjected to severe plastic deformation using high-pressure torsion technique at room temperature. The severe plastic deformation led not only to the grain size reduction but also to the transformation of austenite into deformation-induced martensite. At high imposed strains the martensitic boundaries disappeared and misorientation distribution exhibited nearly random misorientation distribution. The thermal exposure and tensile creep tests under constant load performed at 923 K and stresses ranging from 50 to 150 MPa revealed that austenitic microstructure contains a phase. The ultrafine-grained microstructure coarsens during creep testing but the mean grain size is significantly finer than the predicted stationary subgrain. The results demonstrate that during creep testing new grains at precipitates of a phase are formed and texture changes. The formation of new grains during creep keeps the microstructure of being ultrafine-grained and thus grain boundary mediated processes are enhanced in this steel.
Permanent Link: http://hdl.handle.net/11104/0309317