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Revealing hot ductility behavior of a Fe-0.3C-9Mn-2Al medium Mn steel

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  • Received: 29 July 2020Revised: 5 October 2020Accepted: 6 October 2020Available online: 7 October 2020
  • The hot ductility of a Fe-0.3C-9Mn-2Al medium Mn steel was investigated by using a Gleeble3800 thermo-mechanical simulator. Hot tensile tests were conducted at different temperatures (600~1300 oC) under a constant strain rate of 4 × 10-3 s-1. The fracture behavior and mechanism of hot ductility evolution were discussed. The results showed that the hot ductility exhibited a decreasing trend with temperature decreasing from 1000 oC. The reduction of area (RA) decreased rapidly tested below 700 oC and the value was lower than 65% for specimen tested at 650 oC. Mixed brittle-ductile fracture feature is reflected by the coexistence of cleavage step, intergranular facet and dimple at the surface. The fracture belonged to ductile failure for specimens between 720~1000 oC. Large and deep dimples could delay the crack propagation. The change of average width of dimples was in positive proportion with the change of RA. The wide austenite-ferrite intercritical temperature range was crucial for the hot ductility of medium Mn steel. The formation of ferrite film on austenite grain boundaries led to the strain concentration. Yield point elongation occurred at the austenite-ferrite intercritical temperature range during hot tensile test.
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Revealing hot ductility behavior of a Fe-0.3C-9Mn-2Al medium Mn steel

  • Corresponding authors:

    Yong-jin Wang    E-mail: wangyongjin@ustb.edu.cn

    Ren-bo Song    E-mail: songrb@mater.ustb.edu.cn

  • 1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract: The hot ductility of a Fe-0.3C-9Mn-2Al medium Mn steel was investigated by using a Gleeble3800 thermo-mechanical simulator. Hot tensile tests were conducted at different temperatures (600~1300 oC) under a constant strain rate of 4 × 10-3 s-1. The fracture behavior and mechanism of hot ductility evolution were discussed. The results showed that the hot ductility exhibited a decreasing trend with temperature decreasing from 1000 oC. The reduction of area (RA) decreased rapidly tested below 700 oC and the value was lower than 65% for specimen tested at 650 oC. Mixed brittle-ductile fracture feature is reflected by the coexistence of cleavage step, intergranular facet and dimple at the surface. The fracture belonged to ductile failure for specimens between 720~1000 oC. Large and deep dimples could delay the crack propagation. The change of average width of dimples was in positive proportion with the change of RA. The wide austenite-ferrite intercritical temperature range was crucial for the hot ductility of medium Mn steel. The formation of ferrite film on austenite grain boundaries led to the strain concentration. Yield point elongation occurred at the austenite-ferrite intercritical temperature range during hot tensile test.

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