Mössbauer analysis of heat affected zones of an SA 508 steel weld

Soon Ju Kwon; Sei J. Oh; Joo Hag Kim; Sangho Kim; Sunghak Lee

doi:10.1016/S1359-6462(98)00428-X

Mössbauer analysis of heat affected zones of an SA 508 steel weld

Soon Ju Kwon, Sei J. Oh, Joo Hag Kim, Sangho Kim, Sunghak Lee

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

In the present study, phases present in the simulated HAZ of the SA 508 steel were identified, and their volume fractions were quantitatively measured by Mössbauer spectroscopy. Specimens with the peak temperature risen up to 1350°C showed mostly martensite, but the microstructures did not change much from the base metal due to minor tempering effect when it was risen to 650°C∼700°C below the A₁ temperature. With the peak temperature risen to 900°C over the A₃ temperature, the martensite fraction was reduced, while bainite or martensite island were formed because of the slow cooling from the lower austenite region. As the martensite fraction present inside the HAZ increased, hardness tended to increase. These Mössbauer spectroscopic results were well correlated with the microstructural observations, and thus enabled to identify the phases which were hard to be identified microstructurally and to analyze them quantitatively.

Original language	English
Pages (from-to)	131-137
Number of pages	7
Journal	Scripta Materialia
Volume	40
Issue number	2
DOIs	https://doi.org/10.1016/S1359-6462(98)00428-X
State	Published - Dec 1998
Externally published	Yes

Funding

This work was supported by Korea Atomic Energy Research Institute. The authors would like to thank Drs. Yong Joon Oh and Joon Hwa Hong of Korea Atomic Energy Research Institute for their helpful discussion on microstructural analysis. One of the authors, Dr. Sei J. Oh, thanks to the post-doctoral fellowship from the Korean Science and Engineering Foundation.

Funders	Funder number
Korea Atomic Energy Research Institute
Korea Science and Engineering Foundation

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abstract = "In the present study, phases present in the simulated HAZ of the SA 508 steel were identified, and their volume fractions were quantitatively measured by M{\"o}ssbauer spectroscopy. Specimens with the peak temperature risen up to 1350°C showed mostly martensite, but the microstructures did not change much from the base metal due to minor tempering effect when it was risen to 650°C∼700°C below the A1 temperature. With the peak temperature risen to 900°C over the A3 temperature, the martensite fraction was reduced, while bainite or martensite island were formed because of the slow cooling from the lower austenite region. As the martensite fraction present inside the HAZ increased, hardness tended to increase. These M{\"o}ssbauer spectroscopic results were well correlated with the microstructural observations, and thus enabled to identify the phases which were hard to be identified microstructurally and to analyze them quantitatively.",

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Mössbauer analysis of heat affected zones of an SA 508 steel weld

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