摘要
通过系列Gleeble热模拟试验,系统研究了压力容器用Q345R钢在850-1200℃、1-30s-1应变速率条件下的热变形特性及组织特点。结果如下:在较低的变形温度及较高的变形速率条件下,Q345R钢的真应力-应变曲线基本为动态回复型;在高温低应变速率的情况下,应力应变曲线为动态再结晶型。热变形温度对Q345R钢的组织有着重要影响。在950℃以下变形后空冷,由于微观偏析的遗传及扩散不充分,铁素体和珠光体呈条带状分布;在1000℃以上变形空冷,获得均匀分布的铁素体与珠光体。
Through a series of hot simulation experiments on Gleeble machine, hot deformation behaviors and microstructure characteristics for Q345R steel were systematically studied under different deformation temperature range of 850-1200 ℃ and the strain rate range of 1-30 s-1. The results are as follows： under lower temperature and higher strain rate, stress-strain curves of Q345R steel are almost the dynamical recovery type, but under high temperature and low strain rate, stress-strain curves are dynamic recrystallization type. Further microstructure analysis shows that the hot forming temperature to microstructure of Q345R steel has important influence. When Q345R forming at the temperature below 950℃ then cooling in air, ferrite and pearlite are banded distribution due to the heredity of microsegregation and not enough diffusion; when Q345R forming at the temperature above 1000℃ then cooling in air, the uniform distribution of ferrite and pearlite can be obtained.
出处
《热加工工艺》
CSCD
北大核心
2013年第1期8-11,共4页
Hot Working Technology
关键词
Q345R钢
热变形
组织演化
Q345R
hot deformation processes
microstructure characteristics
