• Effect of weld heat input on toughness and structure of HAZ of a new super-high strength steel

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      https://www.ias.ac.in/article/fulltext/boms/026/03/0301-0305

    • Keywords

       

      Super-high strength steel; heat-affected zone; fracture; fine structure.

    • Abstract

       

      Fracture morphology and fine structure in the heat-affected zone (HAZ) of HQ130 super-high strength steel are studied by means of SEM, TEM and electron diffraction technique. Test results indicated that the structure of HAZ of HQ130 steel was mainly lath martensite (ML), in which there were a lot of dislocations in the sub-structure inside ML lath, the dislocation density was about (0.3 ∼ 0.9) × 1012/cm2. No obvious twin was observed in the HAZ under the condition of normal weld heat input. By controlling weld heat input ($E \leq$ 20 kJ/cm), the impact toughness in the HAZ can be assured.

    • Author Affiliations

       

      Wang Juan1 Li Yajiang2 Liu Peng1

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

       

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