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      https://www.ias.ac.in/article/fulltext/boms/026/04/0441-0447

    • Keywords

       

      HSLA steel; thermomechanical aging; Cu-bearing steel.

    • Abstract

       

      Investigations were carried out on aging of a HSLA-100 steel after varying amounts of cold deformation. Mechanical properties (hardness, tensile properties and toughness) were measured and structural changes were studied using optical, TEM and SEM techniques. As a result of various treatments, the hardness and UTS could be significantly improved, but with drastic fall in ductility and impact strength, especially in peak aged conditions. The parameters affecting impact strength were examined and it was concluded that various microstructural features affected toughness through their influence on tensile properties. In this steel the impact strength could be improved by lowering the UTS and increasing the ductility (pct elongation). The improvement in hardness and UTS was attributed to formation of thick precipitate-dislocation tangles. The aging process caused a slow transformation of lath martensite into acicular ferrite due to occurrence of in situ recrystallization. The concentration of Cu in particles precipitating on aging was followed using EDAX technique.

    • Author Affiliations

       

      Sanjay Panwar1 D B Goel1 O P Pandey2 K Satya Prasad3

      1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, Roorkee 247 667, India
      2. School of Physics and Materials Science, Thapar Institute of Engineering and Technology, Patiala 147 004, India
      3. Defence Metallurgical Research Laboratory, Hyderabad 500 058, India
    • Dates

       
  • Bulletin of Materials Science | News

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