EFFECT OF DEFORMATION PARAMETERS ON THE NO-RECRYSTALLIZATION TEMPERATURE IN NB-BEARING STEELS
EFFECT OF DEFORMATION PARAMETERS ON THE NO-RECRYSTALLIZATION TEMPERATURE IN NB-BEARING STEELS
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DOI：
10.1007/bf02648589
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发表时间：
1993-10-01
期刊：
影响因子：
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通讯作者：
JONAS, JJ
中科院分区：
文献类型：
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作者：
BAI, DQ;YUE, S;JONAS, JJ
研究了三种含铌高强度低合金（HSLA）钢在连续冷却条件下多道次变形过程中的再结晶行为。这些钢的铌浓度在 0.05 至 0.09 wt% 之间变化。使用 17 次模拟程序在计算机化扭转机上对样本进行测试。采用 1180 摄氏度至 700 摄氏度的变形温度、0.1 至 0.7 的道次应变、0.2 至 10 s-1 的应变速率以及 5 至 200 秒的道次间时间。通过平均流动应力与 1000/T 的关系图，确定了变形条件对未再结晶温度 (T(nr))（再结晶不再完成的温度）的影响。它随着应变的增加而减小，并且随着应变速率的增加而略有减小。 T(nr) 最小值约为 12 - 15 秒，并且从该值增加和减少都会升高该特征温度。当层间时间较短时，溶质原子控制再结晶速率，其程度随着时间的减少而减小。当层间时间较长时，会发生沉淀并阻碍再结晶，从而软化程度降低。
The recrystallization behavior of three Nb-bearing high-strength low-alloy (HSLA) steels was investigated during multipass deformation under continuous cooling conditions. The niobium concentrations of these steels varied from 0.05 to 0.09 wt pct. The specimens were tested on a computerized torsion machine using a simulation schedule of 17 passes. Deformation temperatures of 1180-degrees-C to 700-degrees-C were employed, together with pass strains of 0.1 to 0.7, strain rates of 0.2 to 10 s-1, and interpass times of 5 to 200 seconds. By means of mean flow stress vs 1000/T diagrams, the effect of the deformation conditions on the no-recrystallization temperature (T(nr)), the temperature at which recrystallization is no longer complete, was determined. It decreases with increasing strain and also decreases slightly with increasing strain rate. There is a T(nr) minimum at times of about 12 - 15 seconds, and both increases and decreases from this value raise this characteristic temperature. When the interpass times are short, solute atoms control the rate of recrystallization, the extent of which decreases as the time is decreased. When the interpass times are long, precipitation takes place and retards recrystallization, so that the extent of softening decreases.