反应堆压力容器用SA508Gr.4N钢的热变形行为
发布时间:2018-12-18 15:10
【摘要】:利用Gleeble-1500D热模拟试验机,在温度为1050~1250℃、应变速率为0.001~0.1s-1、真应变量0.16的条件下,研究和分析SA508Gr.4N钢高温塑性变形及动态再结晶行为。结果表明:SA508Gr.4N钢的高温真应力-应变曲线主要以动态再结晶为特征,峰值应力随变形温度的降低或应变速率的升高而增加,属于温度和应变速率敏感材料;在真应力-应变曲线的基础上,建立材料热变形本构方程,较好地表征了材料高温流变特征,其热激活能为383.862kJ/mol;其硬化率-应力(θ-σ)曲线均呈现拐点且-dθ/dσ-σ曲线出现极小值;临界应变随应变速率的增大与变形温度的降低而增加,且临界应变(εc)与峰值应变(εp)之间具有一定相关性,即εc/εp=0.517;临界应变与Z参数之间的函数关系为εc=8.57×10-4 Z0.148。
[Abstract]:The high temperature plastic deformation and dynamic recrystallization behavior of SA508Gr.4N steel were studied and analyzed by using Gleeble-1500D thermal simulator under the condition of 1050U 1250 鈩,
本文编号:2386028
[Abstract]:The high temperature plastic deformation and dynamic recrystallization behavior of SA508Gr.4N steel were studied and analyzed by using Gleeble-1500D thermal simulator under the condition of 1050U 1250 鈩,
本文编号:2386028
本文链接:https://www.wllwen.com/kejilunwen/jiagonggongyi/2386028.html