변형지도 모델링을 통한 몰리브데늄의 고온 변형에따른 미세조직 변화 연구
Microstructural Evolution during Hot Deformation of Molybdenum using Processing Map Approach
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The hot deformation characteristics of pure molybdenum was investigated in the temperature range of 600~1200°C and strain rate range of 0.01~10.0/s using a Gleeble test machine. The power dissipation map for hot working was developed on the basis of the Dynamic Materials Model. According to the map, dynamic recrystallization (DRX) occurs in the temperature range of 1000~1100°C and the strain rate range of 0.01~10.0/s, which are the optimum conditions for hot working of this material. The average grain size after DRX is 5 μm. The material undergoes flow instabilities at temperatures of 900~1200°C and the strain rates of 0.1~10.0/s, as calculated by the continuum instability criterion.
Abstract
The hot deformation characteristics of pure molybdenum was investigated in the temperature range of 600~1200°C and strain rate range of 0.01~10.0/s using a Gleeble test machine. The power dissipation map for hot working was developed on the basis of the Dynamic Materials Model. According to the map, dynamic recrystallization (DRX) occurs in the temperature range of 1000~1100°C and the strain rate range of 0.01~10.0/s, which are the optimum conditions for hot working of this material. The average grain size after DRX is 5 μm. The material undergoes flow instabilities at temperatures of 900~1200°C and the strain rates of 0.1~10.0/s, as calculated by the continuum instability criterion.
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