| METALS AND METAL MATRIX COMPOSITES |
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| Temperature-controlled Gradient Phase Transformation Strengthening Pattern for Ultra-high-strength Steel |
| TONG Ying1, GAO Lin2, ZHANG Kaikai2, QUAN Guozheng2, WANG Xuan2, ZHOU Jie2
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1 College of Intelligent Manufacturing and Automotive, Chongqing College of Electronic Engineering, Chongqing 401331
2 School of Materials Science and Engineering, Chongqing University, Chongqing 400044 |
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Abstract The staged variable strength zoning is the prerequisite to satisfy both high strength and high plasticity requirements in the design of automotive lightweight structure. However, the abrupt change of mechanical properties at the junction of different zones has become a tough technical bottleneck. Aiming at seeking the ideal pattern of temperature-controlled gradient phase transformation strengthening for ultra-high strength steel plate, numerical simulation was employed to investigate hot stamping approach capable of achieving the smooth transition of mechanical properties by temperature-controlled gradient phase transformation strengthening. Based on the developed automatic temperature-controlled gradient phase transformation testing platform, a series of gradient temperature-controlled phase transformation hot stamping tests were carried out. Furthermore, the mapping relationship between the tailored gradient cooling conditions and mechanical properties (hardness, tensile strength and elongation at break) of the sheet metal in hot forming process was established. The results showed that temperature-controlled gradient phase transformation strengthening pattern could endow hot forming parts with high-strength and high-plasticity structures, and realize smooth graded microstructure and properties. The increase of die temperature and holding time, and the decrease of initial forming temperature would result in the raise of bainite content, decline of tensile strength and Vickers hardness, and boost of elongation.
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Published: 29 August 2019
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| About author:: Ying Tong, born in 1981, received her master’s degree in mechanical manufacturing engineering from the Chongqing University in 2007. She is currently an associate professor at Chongqing College of Electronic Engineering. Her research interests include multi-field and multi-scale simulation-based design optimization.Guozheng Quan, born in 1980, received his Ph.D. degree in material science and engineering from the Chongqing University in 2007. He is currently an associate professor at Chongqing University. His research interests include microstructural evolution in plastic forming process, multi-field and multi-scale simulation-based design optimization. |
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2019, Vol. 33 
