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| 加磷高强IF钢的最优冷轧压下率确定 |
| Determination of Optimal Cold Reduction Ratio of Adding P High Strength IF Steel |
| Received:June 29, 2010 Revised:November 10, 2010 |
| DOI： |
| 中文关键词: 加磷高强IF钢 冷轧压下率 盐浴退火 显微组织 力学性能 |
| 英文关键词: adding P high strength IF steel cold reduction ratio salt-bath annealing microstructure mechanical properties |
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| 中文摘要: |
| 为了确定加磷高强IF钢的最优冷轧压下率，以工业生产的加磷高强IF钢热轧钢板为试验材料，在实验室进行了冷轧试验和盐浴退火试验，研究了冷轧压下率对试验钢显微组织和力学性能的影响。结果表明：在试验条件下，试验钢冷轧压下率为50%～80%，退火温度为820～850 ℃时，再结晶完成；随着冷轧压下率的增加，晶粒变得细小均匀；冷轧压下率为50%～80%，退火温度为850 ℃时，屈服强度为160 MPa左右，抗拉强度为345 MPa左右，延伸率为35.0%左右，塑性应变比r值和应变硬化指数n值都较高，r值为1.5左右，n值为0.30左右。最终确定工业生产中最优冷轧压下率为60%～70%。 |
| 英文摘要: |
| In order to determine the optimal cold reduction ratio of adding P high strength IF steel,hot rolled adding P high strength IF steel sheet was used to study the effect of cold reduction ratio on the microstructures and mechanical properties by means of cold rolling test and salt-bath annealing test in the laboratory. The experimental results showed that the recrystallization had finished after cold rolling followed cold reduction ratio 50% to 80%, and annealing temperature from 820 ℃ to 850 ℃ under experimental condition. When the cold reduction ratio was increased, the grain changed fine and uniform. The yield strength, tensile strength and elongation percentage were approximately 160 MPa,345 MPa and 35.0% respetively, the plastic strain ratio r value and the strain hardening exponent n value reached larger value respectively, the r value was approximately 1.5, the n value was approximately 0.30 in which condition cold reduction ratio was 50% to 80% and annealing temperature was 850 ℃. The optimal cold reduction ratio was 60% to 70%. |
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