Creep Resistance of S304H Austenitic Steel Processed by High-Pressure Sliding

0551972 - ÚFM 2023 RIV CH eng J - Journal Article
Král, Petr - Dvořák, Jiří - Sklenička, Václav - Horita, Z. - Takizawa, Y. - Tang, YP. - Král, Lubomír - Kvapilová, Marie - Roupcová, Pavla - Horváth, J.
Creep Resistance of S304H Austenitic Steel Processed by High-Pressure Sliding.
Materials. roč. 15, č. 1 (2022), č. článku 331. E-ISSN 1996-1944
R&D Projects: GA ČR(CZ) GA19-18725S
Institutional support: RVO:68081723
Keywords : austenitic steels * creep properties * severe plastic deformation
OECD category: Materials engineering
Impact factor: 3.4, year: 2022
Method of publishing: Open access
https://www.mdpi.com/1996-1944/15/1/331

Sheets of coarse-grained S304H austenitic steel were processed by high-pressure sliding (HPS) at room temperature and a ultrafine-grained microstructure with a mean grain size of about 0.14 mu m was prepared. The microstructure changes and creep behavior of coarse-grained and HPS-processed steel were investigated at 500-700 degrees C under the application of different loads. It was found that the processing of S304H steel led to a significant improvement in creep strength at 500 degrees C. However, a further increase in creep temperature to 600 degrees C and 700 degrees C led to the deterioration of creep behavior of HPS-processed steel. The microstructure results suggest that the creep behavior of HPS-processed steel is associated with the thermal stability of the SPD-processed microstructure. The recrystallization, grain growth, the coarsening of precipitates led to a reduction in creep strength of the HPS-processed state. It was also observed that in the HPS-processed microstructure the fast formation of sigma-phase occurs. The sigma-phase was already formed during slight grain coarsening at 600 degrees C and its formation was enhanced after recrystallization at 700 degrees C.
Permanent Link: http://hdl.handle.net/11104/0330883