Investigation of the microstructure evolution in TP347HFG austenitic steel at 700°C and its characterization method

This article reports the microstructure evolution in TP347HFG austenitic steel during the aging process. The experiments were carried out at 700°C with different aging time from 500 to 3,650 h. The metallographic results show that the coherent twin and incoherent twin are existed in the original TP3...

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Autores principales:	Zhang Yuetao, Yuan Tingbi, Shao Yawei, Wang Xiao
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2021
Materias:	tp347hfg twin structure precipitates nonlinear ultrasonic technique Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248
Acceso en línea:	https://doaj.org/article/e75a2f4a0d054bebb8e674574ceb1841
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spelling	oai:doaj.org-article:e75a2f4a0d054bebb8e674574ceb18412021-12-05T14:10:50ZInvestigation of the microstructure evolution in TP347HFG austenitic steel at 700°C and its characterization method2191-032410.1515/htmp-2021-0013https://doaj.org/article/e75a2f4a0d054bebb8e674574ceb18412021-02-01T00:00:00Zhttps://doi.org/10.1515/htmp-2021-0013https://doaj.org/toc/2191-0324This article reports the microstructure evolution in TP347HFG austenitic steel during the aging process. The experiments were carried out at 700°C with different aging time from 500 to 3,650 h. The metallographic results show that the coherent twin and incoherent twin are existed in the original TP347HFG grains, while they gradually vanished with the increase of the aging time. After aging for 500 h, a lot of fine, dispersed particles precipitated from the matrix, but they disappeared after aging for 1,500 h. When the aging time extend to 3,650 h, the precipitates appeared apparently coarse in TP347HFG steel, which include the M23C6 and σ phase; besides, the micro-hardness of TP347HFG also changes during the aging, which was closely related to the effect of dispersion strengthening and solution strengthening. The results of the nonlinear ultrasonic measurement reveal that the β′ of TP347HFG steel was also changed with the aging time. It first increased at 0–500 h, then reduced later, and increased finally at 1,500–3,650 h. The variation of β′ in TP347HFG was influenced by a combined effect of the twin microstructure and the precipitate phase, which indicate that the nonlinear ultrasonic technique can be utilized to characterize the microstructure evolution in TP347HFG.Zhang YuetaoYuan TingbiShao YaweiWang XiaoDe Gruyterarticletp347hfgtwin structureprecipitatesnonlinear ultrasonic techniqueTechnologyTChemical technologyTP1-1185Chemicals: Manufacture, use, etc.TP200-248ENHigh Temperature Materials and Processes, Vol 40, Iss 1, Pp 12-22 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	tp347hfg twin structure precipitates nonlinear ultrasonic technique Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248
spellingShingle	tp347hfg twin structure precipitates nonlinear ultrasonic technique Technology T Chemical technology TP1-1185 Chemicals: Manufacture, use, etc. TP200-248 Zhang Yuetao Yuan Tingbi Shao Yawei Wang Xiao Investigation of the microstructure evolution in TP347HFG austenitic steel at 700°C and its characterization method
description	This article reports the microstructure evolution in TP347HFG austenitic steel during the aging process. The experiments were carried out at 700°C with different aging time from 500 to 3,650 h. The metallographic results show that the coherent twin and incoherent twin are existed in the original TP347HFG grains, while they gradually vanished with the increase of the aging time. After aging for 500 h, a lot of fine, dispersed particles precipitated from the matrix, but they disappeared after aging for 1,500 h. When the aging time extend to 3,650 h, the precipitates appeared apparently coarse in TP347HFG steel, which include the M23C6 and σ phase; besides, the micro-hardness of TP347HFG also changes during the aging, which was closely related to the effect of dispersion strengthening and solution strengthening. The results of the nonlinear ultrasonic measurement reveal that the β′ of TP347HFG steel was also changed with the aging time. It first increased at 0–500 h, then reduced later, and increased finally at 1,500–3,650 h. The variation of β′ in TP347HFG was influenced by a combined effect of the twin microstructure and the precipitate phase, which indicate that the nonlinear ultrasonic technique can be utilized to characterize the microstructure evolution in TP347HFG.
format	article
author	Zhang Yuetao Yuan Tingbi Shao Yawei Wang Xiao
author_facet	Zhang Yuetao Yuan Tingbi Shao Yawei Wang Xiao
author_sort	Zhang Yuetao
title	Investigation of the microstructure evolution in TP347HFG austenitic steel at 700°C and its characterization method
title_short	Investigation of the microstructure evolution in TP347HFG austenitic steel at 700°C and its characterization method
title_full	Investigation of the microstructure evolution in TP347HFG austenitic steel at 700°C and its characterization method
title_fullStr	Investigation of the microstructure evolution in TP347HFG austenitic steel at 700°C and its characterization method
title_full_unstemmed	Investigation of the microstructure evolution in TP347HFG austenitic steel at 700°C and its characterization method
title_sort	investigation of the microstructure evolution in tp347hfg austenitic steel at 700°c and its characterization method
publisher	De Gruyter
publishDate	2021
url	https://doaj.org/article/e75a2f4a0d054bebb8e674574ceb1841
work_keys_str_mv	AT zhangyuetao investigationofthemicrostructureevolutionintp347hfgausteniticsteelat700canditscharacterizationmethod AT yuantingbi investigationofthemicrostructureevolutionintp347hfgausteniticsteelat700canditscharacterizationmethod AT shaoyawei investigationofthemicrostructureevolutionintp347hfgausteniticsteelat700canditscharacterizationmethod AT wangxiao investigationofthemicrostructureevolutionintp347hfgausteniticsteelat700canditscharacterizationmethod
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Investigation of the microstructure evolution in TP347HFG austenitic steel at 700°C and its characterization method

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