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Yield-strength prediction of flattened steel pipes by competing Bauschinger effect and strain hardening during pipe-forming
Since flattened steel sheets often show the unexpectedly lower or higher yield strength than leveled sheets, unceasing efforts have been made to accurately predict the yield strength in pipe-forming industries. In the present investigation, the yield strength of line-pipe or casing-pipe steels was p...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6768990/ https://www.ncbi.nlm.nih.gov/pubmed/31570742 http://dx.doi.org/10.1038/s41598-019-50328-4 |
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author | Kim, Dae Woong Kim, Wan-Keun Bae, Jin-ho Choi, Won-Doo Kim, Hyoung Seop Lee, Sunghak |
author_facet | Kim, Dae Woong Kim, Wan-Keun Bae, Jin-ho Choi, Won-Doo Kim, Hyoung Seop Lee, Sunghak |
author_sort | Kim, Dae Woong |
collection | PubMed |
description | Since flattened steel sheets often show the unexpectedly lower or higher yield strength than leveled sheets, unceasing efforts have been made to accurately predict the yield strength in pipe-forming industries. In the present investigation, the yield strength of line-pipe or casing-pipe steels was predicted by competing Bauschinger effect and strain hardening occurred during the pipe-forming. Yield drop (YD) and yield rise (YR) parameters were newly defined from cyclic simulation analyses of outer and inner walls of pipes to express more reasonably the Bauschinger effect and strain hardening. The YD increased abruptly until the pre-strain of about 1%, and then saturated, while the YR increased linearly with increasing pre-strain. By combining the YD and YR, the variation in yield strength (Δσ) showed a down-and-up behavior as the Bauschinger effect and strain hardening were dominant at low and high pre-strains, respectively, and plausibly explained the relationship of Δσ and piping strain used in pipe-forming industries. According to the microstructural analyses related to the down-and-up Δσ behavior, the polygonal ferrite reduced the yield-strength reduction in the low pre-strain range, whereas the granular bainite or pearlite expanded it. This yield strength prediction coupled with microstructural analyses provide a good idea for designing and reliably predicting the yield strength of in various steel pipes. |
format | Online Article Text |
id | pubmed-6768990 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-67689902019-10-04 Yield-strength prediction of flattened steel pipes by competing Bauschinger effect and strain hardening during pipe-forming Kim, Dae Woong Kim, Wan-Keun Bae, Jin-ho Choi, Won-Doo Kim, Hyoung Seop Lee, Sunghak Sci Rep Article Since flattened steel sheets often show the unexpectedly lower or higher yield strength than leveled sheets, unceasing efforts have been made to accurately predict the yield strength in pipe-forming industries. In the present investigation, the yield strength of line-pipe or casing-pipe steels was predicted by competing Bauschinger effect and strain hardening occurred during the pipe-forming. Yield drop (YD) and yield rise (YR) parameters were newly defined from cyclic simulation analyses of outer and inner walls of pipes to express more reasonably the Bauschinger effect and strain hardening. The YD increased abruptly until the pre-strain of about 1%, and then saturated, while the YR increased linearly with increasing pre-strain. By combining the YD and YR, the variation in yield strength (Δσ) showed a down-and-up behavior as the Bauschinger effect and strain hardening were dominant at low and high pre-strains, respectively, and plausibly explained the relationship of Δσ and piping strain used in pipe-forming industries. According to the microstructural analyses related to the down-and-up Δσ behavior, the polygonal ferrite reduced the yield-strength reduction in the low pre-strain range, whereas the granular bainite or pearlite expanded it. This yield strength prediction coupled with microstructural analyses provide a good idea for designing and reliably predicting the yield strength of in various steel pipes. Nature Publishing Group UK 2019-09-30 /pmc/articles/PMC6768990/ /pubmed/31570742 http://dx.doi.org/10.1038/s41598-019-50328-4 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Kim, Dae Woong Kim, Wan-Keun Bae, Jin-ho Choi, Won-Doo Kim, Hyoung Seop Lee, Sunghak Yield-strength prediction of flattened steel pipes by competing Bauschinger effect and strain hardening during pipe-forming |
title | Yield-strength prediction of flattened steel pipes by competing Bauschinger effect and strain hardening during pipe-forming |
title_full | Yield-strength prediction of flattened steel pipes by competing Bauschinger effect and strain hardening during pipe-forming |
title_fullStr | Yield-strength prediction of flattened steel pipes by competing Bauschinger effect and strain hardening during pipe-forming |
title_full_unstemmed | Yield-strength prediction of flattened steel pipes by competing Bauschinger effect and strain hardening during pipe-forming |
title_short | Yield-strength prediction of flattened steel pipes by competing Bauschinger effect and strain hardening during pipe-forming |
title_sort | yield-strength prediction of flattened steel pipes by competing bauschinger effect and strain hardening during pipe-forming |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6768990/ https://www.ncbi.nlm.nih.gov/pubmed/31570742 http://dx.doi.org/10.1038/s41598-019-50328-4 |
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