• Fine structure in the inter-critical heat-affected zone of HQ130 super-high strength steel

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    • Keywords


      High strength steel; heat-affected zone; M–A constituent; fine structure.

    • Abstract


      The microstructure in the inter-critical 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 (𝑇p = 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.

    • Author Affiliations


      Li Yajiang1 2 Wang Juan2 Liu Peng2

      1. National Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin 150001, P.R. China
      2. Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, Shandong University, Jinan 250061, P.R. China
    • Dates

  • Bulletin of Materials Science | News

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