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Mechanism of Decrease in Impact Toughness in a Low-Carbon MnCrMoNiCu Plate Steel with Increasing Austenitizing Temperature

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Abstract

In order to reveal how microscopic factors affect the toughness and the occurrence of cleavage fracture of a low-carbon MnCrMoNiCu alloyed steel, a series of thermal treatments was performed on the steel employing a thermomechanical simulator. These involved reheating samples at different temperatures (950-1250 °C), producing different prior austenite sizes, followed by a continuous cooling transformation process. The Charpy V-notch toughness was determined, and the effect of austenite grain size on the ductile-to-brittle transition temperatures of the steel was investigated. The microstructural evolution on the austenite sizes was studied, fracture features were characterized, the critical event for cleavage fracture was identified, and the local cleavage fracture stress σf was calculated. The impact toughness decreased as the austenitizing temperature increased. A quantitative relationship between σf and the size of the initial cleavage fracture facet (microcrack nucleus) af in the lathy martensite + bainite microstructure has been developed.

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Acknowledgment

The authors acknowledge the financial support received from Jiansu Shagang Group Co., Ltd. Dr. Q. X. Feng is thanked for performing the thermomechanical tests.

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Authors and Affiliations

  1. Institute of Research of Iron and Steel, Jiangsu Shagang Co. Ltd., Zhangjiagang City, 215625, Jiangsu Province, People’s Republic of China

    Mi Luo, Dongsheng Liu & Binggui Cheng

  2. State Key Laboratory of Gansu Advanced Processing and Recycling of Non-ferrous Metallic Metals and Key Laboratory of Non-ferrous Metal Alloys of the Ministry of Education, Lanzhou University of Technology, Lanzhou, 730050, China

    Rui Cao & Jianhong Chen

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  1. Mi Luo
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Correspondence to Dongsheng Liu.

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Luo, M., Liu, D., Cheng, B. et al. Mechanism of Decrease in Impact Toughness in a Low-Carbon MnCrMoNiCu Plate Steel with Increasing Austenitizing Temperature. J. of Materi Eng and Perform 27, 4855–4870 (2018). https://doi.org/10.1007/s11665-018-3591-4

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