热挤压工艺对690合金组织的影响及控制  

Influence of Hot Extrusion Process on Microstructure and Control for 690 Alloy

作　　者：李郑周 佴启亮 王宝顺 苏诚 杨亮[1] 董建新[1] Li Zhengzhou;Nai Qiliang;Wang Baoshun;Su Cheng;Yang Liang;Dong Jianxin(University of Science and Technology Beijing,Beijing 100083,China;Zhejiang Jiuli tti-tech Metals Co.Ltd,Huzhou 313028,China;Engineering Research Center of High Performance Nuclear Power Pipe Forming of Zhejiang Province,Huzhou 313028,China)

机构地区：[1]北京科技大学,北京100083 [2]浙江久立特材科技股份有限公司,浙江湖州313028 [3]浙江省核电用高性能管材成形工程技术研究中心,浙江湖州313028

出　　处：《稀有金属材料与工程》2018年第12期3776-3783,共8页Rare Metal Materials and Engineering

摘　　要：利用Gleeble热压缩实验,构建了690合金的挤压工艺再结晶图,探讨了完全动态再结晶的临界挤压工艺,将合金的热变形组织演变模型带入Deform-2D有限元软件,并针对挤压中合金的组织演变过程对有限元软件进行了二次开发,进而模拟计算了挤压比、坯料温度以及挤压速率对690合金挤压管组织的影响规律,依据挤压机设备能力以及组织要求提出了挤压工艺的控制方法,并进一步根据有限元计算结果进行实际挤压验证。结果表明:挤压管的晶粒尺寸随着挤压比的增大呈现出先降低后增加的趋势;690合金挤压管的晶粒尺寸随坯料温度和挤压速度的降低而减小;当坯料温度在1200℃,挤压比为15.3,挤压速率200mm/s时,挤压管的晶粒尺寸可以控制在62.7μm以下;模拟计算结果与挤压管的相对误差仅为4.5%。The critical extrusion process of the fully dynamic recrystallization of the 690 alloy was analyzed by the Gleeble thermal compression experiment.The microstructure evolution model of 690 alloy was taken into the finite element (FE)software Deform-2D,and the secondary development of the FE software was carried based on the microstructure evolution during extrusion process.Then the influence of extrusion ratio,billet temperature and extrusion speed on the microstructure of 690 alloy were studied.The extrusion process control method for the microstructure of 690 pipe according to the capacity of the extruder and the microstructure requirement was proposed.And further the actual extrusion vertification based on the FE results was performed.The results show that the grain size of the extrusion pipe decreases firstly and then increases with the increasing of extrusion ratio.The grain size of 690 extrusion pipe decreases with the decrease of billet temperature and extrusion speed.The grain size of the extruded pipe can be controlled bellow 62.7μm when the billet temperature is 1200℃ and extrusion ratio is 15.3.The relative error between the simulation results and the extruded pipe is only 4.5%.

关 键 词：热挤压 690合金 再结晶百分比 有限元模拟 二次开发 

分 类 号：TG146.15[一般工业技术—材料科学与工程]