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<p>The present study investigates the mechanical properties like tensile properties, microhardness, residual stress, and microstructural evolution of SS430/AA1050 clad sheet, and its constituent layers. To explore the effects of different temperatures on mechanical properties, the specimens of clad sheet and individual layers were subjected to uniaxial deformation at room temperature, 180, 220, and 300&#xa0;°C. The testing of clad sheet reveals that both yield and tensile strengths decrease with increase in temperature, experiencing a 17% reduction in yield and a 24% reduction in tensile strength at 300&#xa0;°C. The ductility of the clad sheet also decreases by 8%. The strain hardening exponent increases slightly from 0.20 at RT to 0.23 at 300&#xa0;°C, indicating an enhanced ability for uniform strain distribution. The layers of SS430 and AA1050 show different responses: SS430 exhibits a 33% reduction in yield and a 22% reduction in tensile strength, while AA1050 shows a significant reduction in strength (38% in yield and 48% in tensile strength), accompanied by a 12.5% increase in ductility. The residual stresses in both SS430 and AA1050 layers of the tested clad samples are observed to decrease with an increase in temperature. Microstructural analysis highlights the presence of two distinct interface zones: Zone I, rich in Fe, Cr, and Mn, and Zone II, rich in aluminum. Grain boundary maps reveal grain coarsening in both SS430 and AA1050 layers with increase in temperature. At elevated temperatures, SS430 exhibits lower ductility due to an increase in high-angle grain boundaries (HAGBs). Conversely, AA1050 shows improved ductility with a decrease in HAGBs fraction at higher temperatures compared to room temperature. At 300&#xa0;°C, the dislocation density decreases due to annihilation during recovery, which reduces barriers to dislocation motion. This study provides valuable insights to understand the temperature-dependent behavior of SS430/AA1050 clad sheet in the warm forming temperature regime.</p>

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Temperature-Dependent Mechanical Properties and Interfacial Microstructural Evolution of a 2-ply Clad Sheet

  • 期刊论文

  • 发表日期：

    2025年8月22日

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  • Bijendra Prasad,
  • Vijay Gautam

摘要

The present study investigates the mechanical properties like tensile properties, microhardness, residual stress, and microstructural evolution of SS430/AA1050 clad sheet, and its constituent layers. To explore the effects of different temperatures on mechanical properties, the specimens of clad sheet and individual layers were subjected to uniaxial deformation at room temperature, 180, 220, and 300 °C. The testing of clad sheet reveals that both yield and tensile strengths decrease with increase in temperature, experiencing a 17% reduction in yield and a 24% reduction in tensile strength at 300 °C. The ductility of the clad sheet also decreases by 8%. The strain hardening exponent increases slightly from 0.20 at RT to 0.23 at 300 °C, indicating an enhanced ability for uniform strain distribution. The layers of SS430 and AA1050 show different responses: SS430 exhibits a 33% reduction in yield and a 22% reduction in tensile strength, while AA1050 shows a significant reduction in strength (38% in yield and 48% in tensile strength), accompanied by a 12.5% increase in ductility. The residual stresses in both SS430 and AA1050 layers of the tested clad samples are observed to decrease with an increase in temperature. Microstructural analysis highlights the presence of two distinct interface zones: Zone I, rich in Fe, Cr, and Mn, and Zone II, rich in aluminum. Grain boundary maps reveal grain coarsening in both SS430 and AA1050 layers with increase in temperature. At elevated temperatures, SS430 exhibits lower ductility due to an increase in high-angle grain boundaries (HAGBs). Conversely, AA1050 shows improved ductility with a decrease in HAGBs fraction at higher temperatures compared to room temperature. At 300 °C, the dislocation density decreases due to annihilation during recovery, which reduces barriers to dislocation motion. This study provides valuable insights to understand the temperature-dependent behavior of SS430/AA1050 clad sheet in the warm forming temperature regime.