Hot deformation behavior and microstructural evolution of a modified 310 austenitic steel |
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| Affiliation: | 1. Bundesanstalt für Materialforschung und -prüfung, Unter den Eichen 87, Berlin D-12205, Germany;2. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, Berlin 14109, Germany;3. Metals and Alloys, University Bayreuth, Prof.-Rüdiger-Bormann-Str. 1, Bayreuth 95447, Germany;4. Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf D- 40237, Germany;1. Luleå University of Technology, 971 87 Luleå, Sweden;2. AB Sandvik Coromant, Metal Cutting Modeling, 811 81 Sandviken, Sweden;1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China;2. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, College of Mechanical Engineering, Yanshan University, Qinhuangdao 066004, PR China;3. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, PR China;4. Department of Nuclear Engineering, North Carolina State University, Raleigh, NC 27695-7909, USA |
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| Abstract: | To study the hot deformation behavior and microstructural evolution of a new modified 310 austenitic steel, hot compression tests were conducted at the temperature range from 800 to 1100 °C with strain rate of 0.1–10 s−1 and strain of 30–70% using Gleeble 3500 thermal–mechanical simulator. The results showed that the serrated flow curves were caused by the competitive interaction between solute atoms and mobile dislocations. There were some coarsened precipitates on the high angle grain boundaries (HAGBs), which facilitated the nucleation of dynamic recrystallization grains. But these precipitates inhibited the growth of the recrystallization grains, and changed the deformation texture in the matrix. Low angle grain boundaries (LAGBs) decreased, while twin GBs and random HAGBs and increased as dynamic recrystallization occurred. Dynamic recrystallization occurred more readily at evaluated temperature or high strain rate. The true stress decreased with the reduction of LAGBs percent. The internal connections between mechanics and microstructures were also discussed. |
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| Keywords: | Austenitic stainless steel Dynamic recrystallization Precipitates Electron backscatter diffraction Grain boundary characteristic distributions |
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