J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (5): 477-484.DOI: 10.1016/j.jmst.2016.01.017

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Improved Plasticity and Cold-rolling Workability of Fe-6.5wt%Si Alloy by Warm-rolling with Gradually Decreasing Temperature

Yuanke Mo, Zhihao Zhang, Hongjiang Pan, Jianxin Xie   

  1. Key Laboratory for Advanced Material Processing of Ministry of Education, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2015-10-30 Online:2016-05-10
  • Contact: * Ph.D.; Tel.: +86 10 62332253; Fax: +86 10 62332253.
  • Supported by:

    This work was financially supported by the National Basic Research Program of China (No. 2011CB606300) and the National High-Tech Research and Development Program of China (No. 2012AA03A505). The authors thank Dr. Y.B. Jiang for his helpful discussions.

Abstract:

The effects of warm-rolling process on the microstructure, ordering, mechanical properties and cold-rolling workability of Fe-6.5wt%Si alloy were investigated, where three processes of warm-rolling with the same total reduction of 93% were used, including (1) 500 °C/12 passes/total reduction of 93%, (2) 500 °C/3 passes/total reduction of 50% + 400 °C/9 passes/total reduction of 86%, and (3) 500 °C/3 passes/total reduction of 50% + 400 °C/5 passes/total reduction of 60% + 300 °C/4 passes/total reduction of 64%. The results show that compared with process (1) warm-rolling with constant temperature of 500 °C, process (2) and process (3) warm-rolling with gradually decreasing temperature can significantly improve the room temperature plasticity and cold-rolling workability of the Fe-6.5wt%Si alloy. For example, the three point bending fracture deflections are increased by 54.5% and 81.8% for processes (2) and (3), respectively, and the maximum reductions of single pass cold-rolling without edge crack are increased from 50% of process (1) to 55% of process (2) and 62% of process (3), respectively. The plasticity improvement of the Fe-6.5wt%Si alloy can be attributed to both reductions of surface oxidation degree and order degree of the alloy by warm-rolling with gradually decreasing temperature.

Key words: Fe-6.5wt%Si alloy, Warm-rolling, Gradually decreasing temperature, Ordering, Mechanical property