Cooling process and mechanical properties design of hot-rolled low carbon high strength microalloyed steel for automotive wheel usage |
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| Affiliation: | 1. The State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110819, China;2. Institute of Materials Research, School of Material and Metallurgy, Northeastern University, Shenyang 110819, China;3. WISDRI Engineering & Research Incorporation Limited, Wuhan 430223, China;1. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran;2. Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran;3. Materials Research School, Isfahan, Iran;4. Institute for Materials Testing, Materials Science and Strength of Materials (IMWF), University of Stuttgart, Stuttgart, Germany;1. College of Materials Science and Metallurgical Engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubci, China;2. Institute of Structural Materials, Central Iron and Steel Research Institute, Beijing 100081, China;1. The State Key Laboratory of Rolling and Automation (RAL), Northeastern University, Shenyang 110819, China;2. Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, El Paso, Texas 79968, USA;1. Technology Center of Angang Steel Company Ltd., Anshan, Liaoning 114001, China;2. Angang Steel Company Ltd., Bayuquan Subsidiary Company, Yingkou, Liaoning 115007, China;1. Department of Metallurgy, Graduate School of Engineering, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;2. Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;3. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan;4. Department of Mechanical Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan |
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| Abstract: | For the purpose of developing Nb–V–Ti microalloyed, hot rolled, high strength automotive steel for usage in heavy-duty truck wheel-discs and wheel-rims, appropriate cooling processes were designed, and microstructures and comprehensive mechanical properties (tension, bending, hole-expansion, and Charpy impact) of the tested steels at two cooling schedules were studied. The results indicate that the steel consists of 90% 5 μm polygonal ferrite and 10% pearlite when subjected to a cooling rate of 13 °C/s and a coiling temperature of 650 °C. The yield strength, tensile strength, and hole-expansion ratio are 570 MPa, 615 MPa, and 95%, respectively, which meet the requirements of the wheel-disc application. The steel consists of 20% 3 μm polygonal ferrite and 80% bainite (granular bainite and a small amount of acicular ferrite) when subjected to a cooling rate of 30 °C/s and a coiling temperature of 430 °C. The yield strength, tensile strength, and hole-expansion ratio are 600 MPa, 655 MPa, and 66%, respectively, which meet the requirements of the wheel-rim application. Both the ferrite–pearlite steel and ferrite–bainite steel possess excellent bendability and Charpy impact property. The precipitation behavior and dislocation pattern are characterized and discussed. |
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| Keywords: | Steel design Microstructures Mechanical properties Automotive wheel steel Cooling schedule Strengthening mechanism |
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