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| Research and application of high performance automobile steel |
| HAN Zhi-yong1，ZHANG Ming-da2，XU Hai-feng2,3，DONG Han2，CAO Wen-quan2 |
（1.Technical Center，China First Automotive Work Group Corporation，Changchun 130011，Jilin，China
2. Institute for Special Steels，Cental Iron and Steel Research Institute，Beijing 100081，China
3.Department of Material Science and Technology，Huazhong University of Science and Technology，Wuhan 430074，Hubei，China） |
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Abstract The features of microstructure and properties of the advanced automobile steels were discussed in this paper. The first generation automobile steel usually has the relatively low product of strength and plastic. It was believed that the strength and plasticity of the first generation automobile steel were mostly controlled by the selection and cooperation of ferrite，martensite and other phases. The ultra high product of strength and plastic was obtained in the second generation austenitic automobile steels with single-phase austenite， which contributed a lot to the lightweight and safety. While the high alloy contents in the second generation automobile steels increased the costs and difficulty of the production， which limited the application and industrialization. Introducing more metastable austenite phase into the martensitic or ultrafine grained ferrite matrix is the main ideas to increase the product of strength and plasticity of the third generation automobile steel. At present，the comprehensive mechanical property of the developed 3rd generation automotive steel has increased by more than one time compared with that of the 1st generation steel， the product of strength and plasticity approaches closely to that of the 2rd generation steel， reaching 25-50 GPa·%. The main research of 3rd generation automobile steel in the near future will be focused on the new alloying design，high strength matrix control and high volume metastable austenite development. The trend of future development of 3rd generation automobile steels will be both low-density and high strength based on the idea of lighweight and high safety.
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Received: 08 September 2015
Published: 27 January 2016
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2016, Vol. 51 
