780MPa级冷轧双相钢是低碳低合金钢，主要的金属元素为锰，另外根据强度要求的不同，还加入了适量的Mo、Cr等元素。试验结果表明：690℃卷取可以获得更好的性能；随着退火温度的升高，试验钢的马氏体体积分数增加，强度增加，在820℃获得的综合性能最好；在820℃退火，当退火时间为80~100s时强度变化剧烈；当退火时间超过100s后，变化趋势相对平缓，综合比较，退火时间为100s时，获得的综合性能最好。
780MPa grade cold rolling dual phase steels was low carbon and low-alloy steel, whose main alloy element was Mn and proper quantities of Mo and Cr according to the requirements of different strength. The tested results show that: the better properties can be obtained when final-rolling at 690℃. The content of martensite and strength increases with the increasing of annealing temperature. 780MPa dual phase steels with the most excellent extensibility could be produced at 820℃. When annealing temperature is 820℃, the strength will be markedly increased from 80 to 100s of annealing time. Moreover, the strength will not be obviously increased if annealing time exceeded 100s. Therefore, the most excellent extensibility of 780MPa dual phase steels can be achieved when the annealing time is 100s.
参考文献
| [1] | |
| [2] | 徐祖耀．马氏体相变和马氏体．北京：科学出版社，1980 |
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