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dc.contributor.authorLi, Xianfenen_US
dc.contributor.authorChen, Junen_US
dc.contributor.authorHua, Pengen_US
dc.contributor.authorChen, Keen_US
dc.contributor.authorKong, Weiqingen_US
dc.contributor.authorChu, Haojieen_US
dc.contributor.authorWu, Yuchengen_US
dc.contributor.authorZhou, Weien_US
dc.identifier.citationLi, X., Chen, J., Hua, P., Chen, K., Kong, W., Chu, H., ... Zhou, W. (2018). Effect of post weld heat treatment on the microstructure and properties of Laser-TIG hybrid welded joints for CLAM steel. Fusion Engineering and Design, 128, 175-181. doi:10.1016/j.fusengdes.2018.02.034en_US
dc.description.abstractIn this paper, the Laser-TIG hybrid weld joints of China low activation martensite (CLAM) steel were produced, and then experienced different post weld heat treatment (PWHT) to achieve a good combination of strength and toughness. The microstructure and mechanical properties of the joints were investigated. Meanwhile, the performance of weld joints before and after PWHT subjected to transient heat loads were studied by using a laser beam thermal load test to simulate the transient events in the future fusion reactors. The results indicate that the microstructure of the as-deposited weld metal (WM) was composed of coarse lath martensite and a small amount of hard delta-ferrite, leading to relatively high tensile strength, but low impact toughness (only 16.5% of parent metal). After PWHT, M23C6 type carbides were precipitated along lath martensite and prior austenite grain boundaries. With the prolonging of PWHT, the amount and size of precipitates were increased. After PWHT at 760 °C for 2 h, the precipitates were aggregated. The strength of the weld joints was slightly weakened but acceptable, while the toughness of the weld joints significantly increased, with evidence of many dimples in the ductile fracture surface. After transient heat loads with laser power densities up to 205.7 MW/m2, surface damage such as cracks, pits, re-solidified metal and oxidation were observed, the WM subjected to PWHT at 760 °C for 0.5 h appeared better performance of resistance to oxidation. Hence, PWHT at 760 °C for 0.5 h was suggested for the Laser-TIG hybrid weld joints of CLAM steel, which gave rise to sufficient strength, high toughness and excellent resistance to oxidation.en_US
dc.relation.ispartofFusion Engineering and Designen_US
dc.rights© 2018 Elsevier B.V. All rights reserved.en_US
dc.subjectEngineering::Mechanical engineeringen_US
dc.titleEffect of post weld heat treatment on the microstructure and properties of Laser-TIG hybrid welded joints for CLAM steelen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Mechanical and Aerospace Engineeringen_US
dc.subject.keywordsCLAM Steelen_US
dc.subject.keywordsLaser-TIG Hybrid Weldingen_US
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