Sun Jihong,Liu Zhiwei,Wang Gang,et al.Effect of Al Content on Phase Transformation Law and High-temperature Mechanical Properties of Corrosion-resistant Steel[J].Special Steel,
Sun Jihong,Liu Zhiwei,Wang Gang,et al.Effect of Al Content on Phase Transformation Law and High-temperature Mechanical Properties of Corrosion-resistant Steel[J].Special Steel,DOI:.
Effect of Al Content on Phase Transformation Law and High-temperature Mechanical Properties of Corrosion-resistant Steel
In this paper, the microstructure, hardness, strength and plasticity of the Al-containing corrosion-resistant steel at different cooling rates and temperatures were studied. The corrosion resistant steel was rolled by reversible rolling mill and continuous cooling transformation (CCT) test and the high temperature tensile test were carried out. The results show that Al has a significant effect on the microstructure evolution of the corrosion resistant steel. With the increase of Al content, the ferrite phase region expands, the occurrence temperature of bainite phase region decreases, and the effect of cooling rate on the microstructure morphology is more obvious. The hardness test shows that the hardness increases significantly with the increase of cooling rate, especially when bainite transformation occurs and bainite structure is formed. When the
w
[Al] content is 0.5%, the hardness of the Al-containing corrosion-resistant steel is higher than that when the
w
[Al] content is 1.0 %. Moreover, the maximum force value at 1 300 ℃ for the steel with 0.5%
w
[Al] is 21.9 kgf, indicating better high-temperature strength and ductility. The strength-plasitcity test reveals the difference in mechanical behavior of the two steels at different temperatures, especially the control of the brittle temperature range is important for industrial production. The fracture mechanism of the material at different temperatures is further clarified by microscopic fracture analysis.
This study provides a theoretical basis and technical support for the application of the Al-containing corrosion-resistant steel.
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