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Effect of Coiling Temperature on Microstructure and Tensile Behavior of a Hot-Rolled Ferritic Lightweight Steel

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Abstract

Effects of coiling temperature (CT) ranging from 673 K to 973 K (400 °C to 700 °C) on microstructure and tensile property of a hot-rolled ferritic lightweight steel containing 0.35 wt pct C and 4.1 wt pct Al are investigated in the present study. Basically, the microstructure of the hot-rolled steel is composed of δ-ferrite grain bands and secondary phase bands which are originated from the decomposition of antecedent austenite. The secondary phase band is a bainite band at coiling temperatures (CTs) lower than 723 K (450 °C). More specifically, the bainite band mainly consists of lower bainite together with blocky retained austenite at the CT of 673 K (400 °C), while it primarily contains carbide-free bainite being an aggregate of lath-shaped ferrite and austenite at the CT of 723 K (450 °C). The secondary phase band is a carbide band which mainly contains a pearlite structure at CTs higher than 773 K (500 °C). There are three types of carbides in the steel matrix: transitional ɛ-carbide present inside lower bainite, cementite present within carbide bands as well as at the boundaries between carbide bands and δ-ferrite bands, and κ-carbide present at δ-ferrite grain boundaries which is clearly seen at CTs higher than 773 K (500 °C). The volume fraction of retained austenite reaches the peak value of 9.6 pct at the CT of 723 K (450 °C), and abruptly drops to zero when the CTs are higher than 773 K (500 °C). Lath-shaped retained austenite with a higher volume fraction induces significant enhancement of elongation through the TRIP effect, leading to a uniform elongation of 25 pct and an elongation-to-failure of 32 pct at the CT of 723 K (450 °C). Crack initiation and propagation inside the tested specimens are tracked and fracture surface is observed to help understand the deformation and fracture behavior of the hot-rolled steel.

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Acknowledgments

The authors thank Ms. Jingjing Wang, School of Materials Science and Engineering of Shanghai University for her help with the thermodynamic calculation, and Ms. Rui Huang and Dr. Junliang Liu, Baosteel Iron & Steel Co., Ltd, for their help with the TEM microstructural analyses. This work is financially supported by the National Nature Science Foundation of China (Grant No. 51271112) and the Research Funds from Baosteel Iron & Steel Co., Ltd.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, P.R. China

    Junfeng Wang & Xiaodong Wang

  2. Baoshan Iron & Steel Co., Ltd., Shanghai, China

    Qi Yang & Li Wang

  3. The State Key Laboratory of Development and Application Technology of Automotive Steels (Baosteel), Shanghai, 201900, P.R. China

    Qi Yang & Li Wang

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  1. Junfeng Wang
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  2. Qi Yang
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  3. Xiaodong Wang
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  4. Li Wang
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Correspondence to Qi Yang or Li Wang.

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Manuscript submitted April 8, 2016.

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Wang, J., Yang, Q., Wang, X. et al. Effect of Coiling Temperature on Microstructure and Tensile Behavior of a Hot-Rolled Ferritic Lightweight Steel. Metall Mater Trans A 47, 5918–5931 (2016). https://doi.org/10.1007/s11661-016-3752-8

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