Experimental Investigation of Precipitation Dynamics of Vanadium in HRB500 Rebar
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摘要: 采用应力松弛法对模拟轧制变形后HRB500钢筋中钒的析出动力学进行研究。结果表明,在轧后恒温、恒应变的应力松弛曲线上分别出现了两个拐点,分别对应着钒的开始析出点和析出终了点。钒的析出动力学曲线(析出-温度-时间曲线或PTT曲线)呈明显的C形。随轧制变形量的增加,PTT曲线朝左下方移动。当轧制变形量大于0.2时,钒析出孕育期最短的温度为870℃左右,整个析出过程在3 s内完成。用透射电镜对析出相进行了观察。Abstract: The precipitation dynamics of vanadium in HRB500 rebar after rolling deformation was investigated experimentally by stress relaxation method. The test results show that two turning points appear in the stress relaxation curves under constant temperature and strain after rolling,which correspond to the starting and finishing of precipitation of vanadium respectively. The precipitation-temperature-time (PTT)curves of vanadium present the C shape. With the increment of rolling deformation,the PTT curves move toward the left lower direction. When the rolling deformation is larger than 0.2,the fastest precipitation temperature of vanadium is about 870 ℃,and the precipitation can be finished within 3 sec. Finally,the precipitation particles were observed under TEM.
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Key words:
- HRB500 rebar /
- vanadium /
- precipitation dynamics /
- stress relaxation
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