通过双道次压缩试验，研究一种钒氮微合金钢道次间隔时间内在奥氏体区变形后的软化行为，采用应力补偿法计算静态再结晶的体积分数，并建立静态再结晶动力学模型。分析变形温度与间隔时间以及钒的析出物对静态软化行为的影响。结果表明，在高于900℃时进行第一道次变形，该钒氮微合金钢很快完成了静态再结晶；在850、800℃变形后的等温阶段，发生了形变诱导析出现象，使再结晶激活能增加，静态再结晶进程受到抑制，导致软化率曲线上出现了平台。
Abstract
The softening behaviors of the deformed austenite in a kind of V-N microalloyed steel were studied by using double compression tests. The percentage of static recrystallization was calculated by the stress offset method and the kinetics model of static recrystallization for the tested steel was deduced. The effect of deformation temperature, interval time and the vanadium precipitates on the softening behaviors was analyzed. The results show that static recrystallization process can be finished in a short period of time when the tested steel is deformed at higher temperature, over 900℃. While at lower deformation temperature, 850 or 800℃, there are vanadium precipitates induced by the strain, which increases the recrystallization action energy and restrains the static recrystallization process and the platforms can be observed in the softening curves.
关键词
钒氮微合金钢 /
软化行为 /
静态再结晶 /
析出
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Key words
V-N microalloyed steel /
softening behavior /
static recrystallization /
precipitate
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中图分类号：
TG111·7
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参考文献
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脚注
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