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| Status of superplastic materials and research and development of new superplastic low to medium carbon alloy steel |
| CAO Wen-quan1，ZHANG Wan-li1，XU Hai-feng1,2，WENG Yu-qing1 |
（1. Institute for Special Steels， Central Iron and Steel Research Institute， Beijing 100081， China
2. School of Materials Science and Engineering， Huazhong University of Science and Technology， Wuhan 430074， Hubei， China） |
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Abstract Based on the analysis of the ART and status of the superplasticity of metallic materials，the superplastic behaviors of the steels，such as low to medium carbon steel，the high carbon steel，the duplex stainless steel and the austenitic steel，were reviewed and thus superplasticity of the low to medium carbon alloy steel with biggest quantity for application would be one of the important direction of the superplastic materials. The results indicate that the superplasticity of 1 000% failure elongation can be obtained at strain rate of 10－2/s and deformation temperature of 750-850 ℃ in the low cost and low to medium carbon alloy steel. This excellent superplasticity of our newly developed steel could be attributed to the new alloying design and microstructure control to develop ultrafine microstructure. This finding has broken the status that the conventional low to medium carbon steel has no superplasticity，realizes the innovative development of the superplastic low to medium carbon alloy steel with commercial application potential，and thus would initiate its widely application in the fields of communication，aeronautic and astronautic industries.
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Received: 12 April 2017
Published: 14 November 2017
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2017, Vol. 52 
