摘要
在Gleeble-3800热模拟试验机上,利用热压缩变形研究EH47号船板钢的热变形特性。设置最大真应变为0.7,变形温度分别为950、1 000、1 050、1 100、1 150℃,变形速率为0.1、0.5、1、5、10 s-1。利用试验所得数据通过一系列公式计算并绘制热加工图,结合不同压缩工艺得到的金相组织对比发现：变形温度为（1 000±10）℃、应变速率为0.1 s-1区域耗散率因子η值达0.62以上,再结晶晶粒细小而均匀,为热加工最佳工艺参数;而变形温度为950~1 050℃、应变速率为0.5~2 s-1区域再结晶晶粒较少,晶粒尺寸参差不齐为加工失稳区,热加工时应避免选择该区域。根据热加工图中得出的最佳热加工工艺参数,计算得出现场最佳轧制参数：轧制温度为1 000℃,压下量为15~20 mm。
The hot deformation characteristics of shipbuilding steel EH47 were studied in hot compression tests by the thermal mechanical simulator with Gleeble-3800. The testing conditions were that the maximum strain was 0.7, the defor- mation temperatures were 950, 1000, 1050, 1 100 and 1 150 ℃, and the strain rates were 0.1, 0.5, 1, 5 and 10 s ＇. The processing map was drawn out based on a series of testing data and formulas. The comparison of microstructures with dif- ferent compression parameters showed that the best compression parameter was （ 1 000 ～ 10） ℃ with 0.1 s-＇, the rate of power dissipation-- r/in this region was greater than 0.62, and the dynamically recrystallized grains were finer. The pa- rameter of instability zone located in 950-1 050 ℃ with 0.5-2 s-1, where less amount of dynamically recrystallized grains appeared and the grain sizes were tmeven. Therefore, the instability zone should be avoided during heating processing. The best rolling parameters that the deformation temperature was 1 000 ℃ and the strain rate was 0.1 s ＇, were deter- mined with formulas and the best parameters from the processing map.
出处
《钢铁》
CAS
CSCD
北大核心
2015年第11期93-97,共5页
Iron and Steel
关键词
船板钢
热模拟
热加工图
应变
失稳区
shipbuilding steel
thermal simulation
processing map
strain
instability zone
