北京科技大学学报2011，Vol.33Issue(6)：721-726,6.
卷取温度对热轧X70管线钢层流冷却过程残余应力的影响
Effect of coiling temperature on residual stresses in hot-rolled X70 pipeline steel strips during laminar cooling
摘要
Abstract
The thermal expansion coefficient, high-temperature yield strength and Young' s modulus of hot-rolled X70 pipelinestrips were tested with a thermal expansion instrument and a thermal simulation test machine Gleeble3500. The temperature field, bainitic volume fraction and residual stresses in the hot-rolled strips during laminar cooling were calculated with the finite element software Marc when the coiling temperature is 500, 550 and 600 ℃ , respectively. It is shown that stresses in the strip edge exceed the yield strength of the steel at the same temperature in the earlier water cooling stage, leading to edge waves; but in the end of water cooling,stresses in the strip edge exceed the yield strength again and generates plastic deformation, which causes center waves. Reducing the coiling temperature is in favor of completing bainite transformation and decreasing residual stresses in the hot rolled strips on the assumption that the properties of X70 pipeline steel are ensured.关键词
热轧/带钢/层流冷却/相变/残余应力/有限元Key words
hot rolling/ strip steel/ laminar cooling/ phase transitions/ residual stresses/ finite element method分类
矿业与冶金引用本文复制引用
余伟,卢小节,陈银莉,徐耀文..卷取温度对热轧X70管线钢层流冷却过程残余应力的影响[J].北京科技大学学报,2011,33(6):721-726,6.基金项目
"十一五"国家科技支撑计划资助项目(No.2006BAE03A06) （No.2006BAE03A06）
