【摘 要】
：
通过在热模拟试验机Gleeble-1500上对SA508 Gr.3Cl.1钢进行变形温度为950～1200℃、应变速率为0.001～1 s-1的等温压缩试验,研究了其在高温热变形时的动态再结晶行为.基于P-J法确定了临界应力和临界应变,建立了其与热变形参数Z之间的数学模型.基于改进的Avrami方程建立了SA508 Gr.3Cl.1钢的动态再结晶动力学模型.以变形温度和应变速率为变量建立了动态再结晶尺寸模型.研究结果表明:SA508 Gr.3Cl.1钢在高温低应变速率下,更容易发生动态再结晶.在动态再结晶
【机 构】
：
太原科技大学 材料科学与工程学院,山西 太原 030024;河南科技大学 材料科学与工程学院,河南 洛阳 471023;太原科技大学 材料科学与工程学院,山西 太原 030024
论文部分内容阅读
通过在热模拟试验机Gleeble-1500上对SA508 Gr.3Cl.1钢进行变形温度为950～1200℃、应变速率为0.001～1 s-1的等温压缩试验,研究了其在高温热变形时的动态再结晶行为.基于P-J法确定了临界应力和临界应变,建立了其与热变形参数Z之间的数学模型.基于改进的Avrami方程建立了SA508 Gr.3Cl.1钢的动态再结晶动力学模型.以变形温度和应变速率为变量建立了动态再结晶尺寸模型.研究结果表明:SA508 Gr.3Cl.1钢在高温低应变速率下,更容易发生动态再结晶.在动态再结晶进行充分的情况下,温度越高,应变速率越低,动态再结晶晶粒尺寸越大.动态再结晶尺寸模型计算值与试验值之间的相关系数达0.97.
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