A.Najafi-zadeh
,
R.Ebrahimi
材料科学技术（英文）
The effect of delay time with constant first finishing pass temperature (800℃) has been investigated by means of multi-pass torsion tests on Ti-Nb-IF steel. All the tests have been carried out at a strain rate of 2 s-1 with 11 passes and 0.3 strain each pass. During the final pass, dynamic recrystallization occurs to a degree that depends on the delay time. In short interpass time (1 s) and at these temperatures (T≤800℃) there is not enough time to start static recrystallization, therefore, accumulation of strain occurs and after some passes, strain reaches a critical strain for starting dynamic recrystallization. In this study, the changes of mean flow stress during each pass and also the microstructural observation confirms that dynamic recrystallization occurs after some passes in ferrite phase of this steel. The stress-strain curves with constant temperature obtained by using a kinetic model and compensation of the increasing mean flow stress with decreasing temperature. Thus, this result also confirms that dynamic recrystallization occurs in warm rolling of this IF steel.
关键词:
Warm rolling
,
null
,
null
,
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单庆林
,
彭国仲
,
张丙龙
中国冶金
doi:10.13228/j.boyuan.issn1006-9356.20150096
为了生产高品质的IF钢,对不同钢包镇静时间钢水以及铸坯全氧和夹杂物的变化进行分析和讨论.结果显示,若保证铸坯全氧质量分数小于20×10-6,应保证钢包镇静时间为25 min以上;生产实践表明,采用优化后的工艺,中间包全氧质量分数小于23×10-6的合格率达到了98％,铸坯全氧质量分数小于20×10-6的合格率达到了98％.
关键词:
高品质
,
IF钢
,
镇静时间
