Cargando…
The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel
The effect of ultrafine-grained size on creep behaviour was investigated in P92 steel. Ultrafine-grained steel was prepared by one revolution of high-pressure torsion at room temperature. Creep tensile tests were performed at 873 K under the initially-applied stress range between 50 and 160 MPa. The...
Autores principales: | , , , , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978164/ https://www.ncbi.nlm.nih.gov/pubmed/29757206 http://dx.doi.org/10.3390/ma11050787 |
_version_ | 1783327482318946304 |
---|---|
author | Kral, Petr Dvorak, Jiri Sklenicka, Vaclav Masuda, Takahiro Horita, Zenji Kucharova, Kveta Kvapilova, Marie Svobodova, Marie |
author_facet | Kral, Petr Dvorak, Jiri Sklenicka, Vaclav Masuda, Takahiro Horita, Zenji Kucharova, Kveta Kvapilova, Marie Svobodova, Marie |
author_sort | Kral, Petr |
collection | PubMed |
description | The effect of ultrafine-grained size on creep behaviour was investigated in P92 steel. Ultrafine-grained steel was prepared by one revolution of high-pressure torsion at room temperature. Creep tensile tests were performed at 873 K under the initially-applied stress range between 50 and 160 MPa. The microstructure was investigated using transmission electron microscopy and scanning electron microscopy equipped with an electron-back scatter detector. It was found that ultrafine-grained steel exhibits significantly faster minimum creep rates, and there was a decrease in the value of the stress exponent in comparison with coarse-grained P92 steel. Creep results also showed an abrupt decrease in the creep rate over time during the primary stage. The abrupt deceleration of the creep rate during the primary stage was shifted, with decreasing applied stress with longer creep times. The change in the decline of the creep rate during the primary stage was probably related to the enhanced precipitation of the Laves phase in the ultrafine-grained microstructure. |
format | Online Article Text |
id | pubmed-5978164 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-59781642018-05-31 The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel Kral, Petr Dvorak, Jiri Sklenicka, Vaclav Masuda, Takahiro Horita, Zenji Kucharova, Kveta Kvapilova, Marie Svobodova, Marie Materials (Basel) Article The effect of ultrafine-grained size on creep behaviour was investigated in P92 steel. Ultrafine-grained steel was prepared by one revolution of high-pressure torsion at room temperature. Creep tensile tests were performed at 873 K under the initially-applied stress range between 50 and 160 MPa. The microstructure was investigated using transmission electron microscopy and scanning electron microscopy equipped with an electron-back scatter detector. It was found that ultrafine-grained steel exhibits significantly faster minimum creep rates, and there was a decrease in the value of the stress exponent in comparison with coarse-grained P92 steel. Creep results also showed an abrupt decrease in the creep rate over time during the primary stage. The abrupt deceleration of the creep rate during the primary stage was shifted, with decreasing applied stress with longer creep times. The change in the decline of the creep rate during the primary stage was probably related to the enhanced precipitation of the Laves phase in the ultrafine-grained microstructure. MDPI 2018-05-12 /pmc/articles/PMC5978164/ /pubmed/29757206 http://dx.doi.org/10.3390/ma11050787 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Kral, Petr Dvorak, Jiri Sklenicka, Vaclav Masuda, Takahiro Horita, Zenji Kucharova, Kveta Kvapilova, Marie Svobodova, Marie The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel |
title | The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel |
title_full | The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel |
title_fullStr | The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel |
title_full_unstemmed | The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel |
title_short | The Effect of Ultrafine-Grained Microstructure on Creep Behaviour of 9% Cr Steel |
title_sort | effect of ultrafine-grained microstructure on creep behaviour of 9% cr steel |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5978164/ https://www.ncbi.nlm.nih.gov/pubmed/29757206 http://dx.doi.org/10.3390/ma11050787 |
work_keys_str_mv | AT kralpetr theeffectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT dvorakjiri theeffectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT sklenickavaclav theeffectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT masudatakahiro theeffectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT horitazenji theeffectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT kucharovakveta theeffectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT kvapilovamarie theeffectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT svobodovamarie theeffectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT kralpetr effectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT dvorakjiri effectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT sklenickavaclav effectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT masudatakahiro effectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT horitazenji effectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT kucharovakveta effectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT kvapilovamarie effectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel AT svobodovamarie effectofultrafinegrainedmicrostructureoncreepbehaviourof9crsteel |