1000 MPa級冷軋雙相鋼奧氏體的等時相變動力學

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基金項目:

國家高技術研究發展計劃資助項目(2009AA03Z518)

Austenite isochronal transformation kinetics of 1000 MPa cold rolled dual phase steel

1. School of Materials Science and Engineering, University of Science and Technolog.v Beijing. Beijing 100083, China;
2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China

摘要: 在DIL 805A膨脹儀上測定了1000 MPa級冷軋雙相鋼在連續加熱過程中的熱膨脹曲線.根據杠桿定律得到的奧氏體體積分數的計算值與定量金相測量值符合較好.奧氏體的等時相變動力學可以很好地由JMAK形式的方程描述.文中還分析了冷軋壓下率和加熱速度對奧氏體等時相變動力學的影響,探討了連續加熱奧氏體相變過程中相界面的平衡狀態.
- 雙相鋼 /
- 奧氏體 /
- 相變 /
- 動力學 /
- 冷軋
Abstract: The thermal expansion curves of 1000 MPa cold rolled dual phase steel during continuous heating were tested on a DIL805A dilatometer. The volume fraction of austenite in the steel was calculated by the lever rule method, and it is in good agreement with the result of quantitative metallography. The JMAK equation can predict the austenite isochronal transformation kinetics quite well. The influence of cold rolling reduction and heating rate on austenite isochronal transformation kinetics was also investigated. Finally, the equilibrium condition of phase interfaces during transformation was studied by thermodynamic calculation.
- dual phase steel /
- austenite /
- phase transitions /
- kinetics /
- cold rolling