保溫時間和冷卻方式對Fe-28Mn-2.8Si-2.2Al-TWIP鋼組織和力學性能的影響

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基金項目:

國家自然科學基金資助項目(51474085，51101048)，河北省鋼鐵聯合基金資助項目(E2013208131)

Effect of annealing time and cooling methods on the microstructure and mechanical properties of Fe-28Mn-2.8Si-2.2Al-TWIP steel

1. College of Materials Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China;
2. College of Engineering, Yantai Nanshan University, Yantai 265700, China;
3. National Engineering Research Center for Advanced Rolling Technology, University of Science and Technology Beijing, Beijing 100083, China

摘要: 通過光學顯微鏡和電子背散射衍射技術研究了1000℃退火溫度下保溫時間和冷卻方式對Fe-28Mn-2.8Si-2.2Al-TWIP鋼組織和性能的影響.結果表明:當保溫時間為5、10和20 min時,隨著保溫時間的延長,奧氏體晶粒迅速長大,同時退火孿晶在晶粒內部變長、增厚,抗拉強度和屈服強度同時下降,但是延伸率變化不大.對比水冷和空冷兩種冷卻方式,水冷更有利于TWIP鋼獲得良好的力學性能,同時冷卻速度對晶粒和取向有一定的影響.
- 汽車用鋼 /
- 冷卻 /
- 保溫時間 /
- 微觀組織 /
- 力學性能
Abstract: The effect of annealing time and cooling methods on the microstructure and mechanical properties of Fe-28Mn-2.8Si-2.2Al-TWIP steel was studied by optical microscopy and electron backscatter diffraction technology. It is found that when the annealing time is 5,10 and 20 min,the austenite grains grow quickly. At the same time,annealing twins in the austenite grains get long and thick,the tensile strength and yield strength decrease,but the change in elongation is little. Compared with air cooling,water cooling is more advantageous for the TWIP steel to obtain good mechanical properties,and the cooling rate has a certain effect on the grain orientation.
- automobile steel /
- cooling /
- annealing time /
- microstructure /
- mechanical properties