Cargando…
Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel
The effect of peak temperature (T(P)) on the microstructure and impact toughness of the welding heat-affected zone (HAZ) of Q690 high-strength bridge steel was studied using a Gleeble-3500 thermal simulation testing machine. The results show that the microstructure of the inter critical heat-affecte...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8198362/ https://www.ncbi.nlm.nih.gov/pubmed/34072899 http://dx.doi.org/10.3390/ma14112981 |
_version_ | 1783707120247504896 |
---|---|
author | Zhang, Yue Xiao, Jun Liu, Wei Zhao, Aimin |
author_facet | Zhang, Yue Xiao, Jun Liu, Wei Zhao, Aimin |
author_sort | Zhang, Yue |
collection | PubMed |
description | The effect of peak temperature (T(P)) on the microstructure and impact toughness of the welding heat-affected zone (HAZ) of Q690 high-strength bridge steel was studied using a Gleeble-3500 thermal simulation testing machine. The results show that the microstructure of the inter critical heat-affected zone (ICHAZ) was ferrite and bainite. The microstructure of fine grain heat-affected zone (FGHAZ) and coarse grain heat-affected zone (CGHAZ) was lath bainite (LB), lath martensite (LM), and granular bainite (GB), but the microstructure of FGHAZ was finer. With the increase in peak temperature, the content of LB and GB decreased, the content of LM increased, and the lath bundles of LM and LB gradually became coarser. With the increase in peak temperature, the grain size of the original austenite increased significantly, and the impact toughness decreased significantly. When the peak temperature was 800 °C, the toughness was the best. For CGHAZ, the peak temperature should be less than 1200 °C to avoid excessive growth of grain and reduction of mechanical property. |
format | Online Article Text |
id | pubmed-8198362 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-81983622021-06-14 Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel Zhang, Yue Xiao, Jun Liu, Wei Zhao, Aimin Materials (Basel) Article The effect of peak temperature (T(P)) on the microstructure and impact toughness of the welding heat-affected zone (HAZ) of Q690 high-strength bridge steel was studied using a Gleeble-3500 thermal simulation testing machine. The results show that the microstructure of the inter critical heat-affected zone (ICHAZ) was ferrite and bainite. The microstructure of fine grain heat-affected zone (FGHAZ) and coarse grain heat-affected zone (CGHAZ) was lath bainite (LB), lath martensite (LM), and granular bainite (GB), but the microstructure of FGHAZ was finer. With the increase in peak temperature, the content of LB and GB decreased, the content of LM increased, and the lath bundles of LM and LB gradually became coarser. With the increase in peak temperature, the grain size of the original austenite increased significantly, and the impact toughness decreased significantly. When the peak temperature was 800 °C, the toughness was the best. For CGHAZ, the peak temperature should be less than 1200 °C to avoid excessive growth of grain and reduction of mechanical property. MDPI 2021-05-31 /pmc/articles/PMC8198362/ /pubmed/34072899 http://dx.doi.org/10.3390/ma14112981 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/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 (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Zhang, Yue Xiao, Jun Liu, Wei Zhao, Aimin Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel |
title | Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel |
title_full | Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel |
title_fullStr | Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel |
title_full_unstemmed | Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel |
title_short | Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel |
title_sort | effect of welding peak temperature on microstructure and impact toughness of heat-affected zone of q690 high strength bridge steel |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8198362/ https://www.ncbi.nlm.nih.gov/pubmed/34072899 http://dx.doi.org/10.3390/ma14112981 |
work_keys_str_mv | AT zhangyue effectofweldingpeaktemperatureonmicrostructureandimpacttoughnessofheataffectedzoneofq690highstrengthbridgesteel AT xiaojun effectofweldingpeaktemperatureonmicrostructureandimpacttoughnessofheataffectedzoneofq690highstrengthbridgesteel AT liuwei effectofweldingpeaktemperatureonmicrostructureandimpacttoughnessofheataffectedzoneofq690highstrengthbridgesteel AT zhaoaimin effectofweldingpeaktemperatureonmicrostructureandimpacttoughnessofheataffectedzoneofq690highstrengthbridgesteel |