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<p>Developments in third-generation advanced high-strength steels (AHSS) have produced stronger and more formable steels for the automotive industry by controlling chemical composition and mechanical processing. Cracking during cooling after continuous casting has been a prominent problem for these steels and is believed to be influenced by the steel microstructures. In this study, the effects of chemical composition on the mechanical properties are investigated for as-cast steels by performing mechanical tests on steels containing 0.2 wt pct C and 3 wt pct Mn with varying Si and Al concentrations up to 3 wt pct. Tensile tests were performed to measure strength and ductility at temperatures from 200&#xa0;°C to 600&#xa0;°C. Si-alloyed steels have the highest yield strength, while combined silicon- and aluminum-alloyed steels have higher ductility. Fracture surfaces were examined and crack paths were found not to propagate along the ferrite in the microstructure.</p>

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Influence of Si and Al on the Mechanical Properties of Advanced High-Strength Steels (AHSS) in the As-Cast State

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月7日

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  • Nhu Nguyen Anh Ngo,
  • Thinium T. Natarajan,
  • Petrus C. Pistorius,
  • Bryan A. Webler

摘要

Developments in third-generation advanced high-strength steels (AHSS) have produced stronger and more formable steels for the automotive industry by controlling chemical composition and mechanical processing. Cracking during cooling after continuous casting has been a prominent problem for these steels and is believed to be influenced by the steel microstructures. In this study, the effects of chemical composition on the mechanical properties are investigated for as-cast steels by performing mechanical tests on steels containing 0.2 wt pct C and 3 wt pct Mn with varying Si and Al concentrations up to 3 wt pct. Tensile tests were performed to measure strength and ductility at temperatures from 200 °C to 600 °C. Si-alloyed steels have the highest yield strength, while combined silicon- and aluminum-alloyed steels have higher ductility. Fracture surfaces were examined and crack paths were found not to propagate along the ferrite in the microstructure.