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<p>Cast duplex stainless steels are utilized in various applications, including chemical processing equipment, offshore constructions, engine parts, and heat exchange systems. They are well-known for their outstanding corrosion resistance, endurance, and performance in severe working environments. The precipitation of brittle phases restricts their longevity. The microstructure of these steels is determined by their chemical composition and the heat treatments used. This study aims to assess the microstructural and use property changes caused by tempering heat treatment at 500&#xa0;°C, 600&#xa0;°C, and 700&#xa0;°C at a constant holding time of 1&#xa0;hour. The samples were melted in a laboratory vacuum induction furnace and analyzed using optical microscopy, image analysis, and XRD characterization to determine the microstructural changes caused by the heat treatment. Furthermore, hardness measurements and tribology tests were utilized to highlight the influence of applied factors on the mechanical characteristics of the studied steel. Corrosion tests are carried out to determine the effect of tempering holding time in a seawater environment. The results show that increasing the tempering temperature from 500 to 700°C increases the fraction of austenite at the expense of ferrite, affecting hardness, wear behavior, and corrosion resistance.</p>

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Influence of Tempering Temperature on the Microstructural Evolution and Functional Properties of Cast Duplex Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年7月23日

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  • Khedidja Bouhamla,
  • Mohamed Zein Touhami,
  • Salhi Remili,
  • Fatimazohra Derradji

摘要

Cast duplex stainless steels are utilized in various applications, including chemical processing equipment, offshore constructions, engine parts, and heat exchange systems. They are well-known for their outstanding corrosion resistance, endurance, and performance in severe working environments. The precipitation of brittle phases restricts their longevity. The microstructure of these steels is determined by their chemical composition and the heat treatments used. This study aims to assess the microstructural and use property changes caused by tempering heat treatment at 500 °C, 600 °C, and 700 °C at a constant holding time of 1 hour. The samples were melted in a laboratory vacuum induction furnace and analyzed using optical microscopy, image analysis, and XRD characterization to determine the microstructural changes caused by the heat treatment. Furthermore, hardness measurements and tribology tests were utilized to highlight the influence of applied factors on the mechanical characteristics of the studied steel. Corrosion tests are carried out to determine the effect of tempering holding time in a seawater environment. The results show that increasing the tempering temperature from 500 to 700°C increases the fraction of austenite at the expense of ferrite, affecting hardness, wear behavior, and corrosion resistance.