湖南大学学报（自然科学版）2013，Vol.40Issue(4)：80-86,7.
Q690低碳微合金钢热变形微观组织演变及加工图
Microstructure Evolution and Processing Map of Thermal Deformation of Q690 Low Carbon Microalloyed Steel
摘要
Abstract
The hot deformation behavior of Q690 low carbon microalloyed steel was studied with compression tests on a Gleeble-3 800 simulator in the temperature range from 850 ℃ to 1150 ℃ and true strain rate from 0.01 s-1 to 30 s-1.Based on dynamic materials model (DMM),the processing map for the Q690 steel was obtained,and the microstructure characteristics were studied with optical microscope.The resuits have shown that,when the true strain is less than 0.7,there are two efficiency dissipative peak regions (1 000～1 120 ℃,0.01～0.37s-1 and 1 100～1 150 ℃,3.16～30 s-1) and three processing instability regions(850～900 ℃,0.01～0.32s-1 and 850～900 ℃,10～30s-1 and 1 000～1 085 ℃,1～30s-1) in the processing maps.The true strain is more than 0.8,there are two efficiency dissipative peak regions (1 025～1 100℃,0.01～0.38 s-1 and 1 100～1 150 ℃,3～30 s-1),and the flow instability regions appear at the temperature of 850～900 ℃ and the strain of 0.01～30 s-1,as well as at the temperature of 850～1 100 ℃ and the strain rate of 1～30 s-1.The microstructures of the two peak efficiency regions are uniform,fully dynamic recrystallization grain,so the optimum processing parameters of hot deformation have been achieved.关键词
低碳微合金钢/热变形/动态再结晶/加工图Key words
low carbon microalloyed steel/ hot deformation/ dynamic recrystallization/ processing map分类
矿业与冶金引用本文复制引用
向嵩,谭智林..Q690低碳微合金钢热变形微观组织演变及加工图[J].湖南大学学报（自然科学版）,2013,40(4):80-86,7.基金项目
国家自然科学基金资助项目(50901022) （50901022）
