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

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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) x 1012/cm2. No obvious twin was observed in the HAZ under the condition of normal weld heat input. By controlling weld heat input (E ≤20 kJ/cm), the impact toughness in the HAZ can be assured.

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Authors and Affiliations

  1. Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, School of Materials Science and Engineering, Shandong University, 250061, Jinan, P.R. China

    Wang Juan, Li Yajiang & Liu Peng

  2. National Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, 150001, Harbin, P.R. China

    Li Yajiang

Authors
  1. Wang Juan
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  2. Li Yajiang
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  3. Liu Peng
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Juan, W., Yajiang, L. & Peng, L. Effect of weld heat input on toughness and structure of HAZ of a new super-high strength steel. Bull Mater Sci 26, 301–305 (2003). https://doi.org/10.1007/BF02707450

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  • DOI: https://doi.org/10.1007/BF02707450

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