Fine structure in the inter-critical heat-affected zone of HQ130 super-high strength steel |
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Authors: | Li Yajiang Wang Juan Liu Peng |
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Affiliation: | (1) National Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, 150001 Harbin, P.R. China;(2) Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, 250061 Jinan, P.R. China |
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Abstract: | The microstructure in the intercritical heat-affected zone (ICHAZ) of HQ130 steel, has been investigated by thermo-simulation
test, SEM and TEM. The problem of toughness decrease in the ICHAZ (T
p
= 800°C) as well as the effect of M-A constituent and carbide precipitation on brittleness was analysed. The test results
indicated that the microstructure in the ICHAZ of HQ130 steel was mostly a mixture of lath martensite (ML) and granular bainite
(Bg) with a fine but nonuniform grain structure. The cause of brittleness in the ICHAZ was related to production of the M-A
constituent in the local region and carbide precipitation. By controlling the welding heat input carbide precipitation and
the formation of the M-A constituent can be avoided or decreased. |
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Keywords: | High strength steel heat-affected zone M-A constituent fine structure |
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