Hot deformation constitutive equation and processing map of Alloy 690

摘要：

　　The hot deformation behavior of alloy 690 was studied in the temperature range of 800-1300℃ and strain rate range of 0.1-10 s-1 by hot compression tests in a Gleeble 1500+thermal mechanical simulator.The results indicated that flow stress of alloy 690 is sensitive to deformation temperature and strain rate and peak stress increases with decreasing of temperature and increasing of strain rate.In addition,the hot deformation parameters of deformation activation were calculated and the apparent activation energy of this alloy is about 300 kJ/mol.The constitutive equation which can be used to relate peak stress to the absolute temperature and strain rate was obtained.Its further found that the processing maps exhibited two domains which are considered as the optimum windows for hot working.The microstructure observations of the specimens deformed in this domain showed the full dynamic recrystallization(DRX)structure.There was a flow instability domain in the processing map where hot working should be avoided.

关键词： Hot deformation Processing map Constitutive equation Alloy 690 Nuclear system

作者: Han Feng Songchuang Zhang Mingjuan Ma Zhigang Song

作者单位: Central Iron and Research Institute No.76 Xueyuan nanlu,Haidian District Beijing,100081,China Baosteel Group Corporation No.1269 Shuichanlu,Baoshan District Shanghai,200940,China

会议类型: 国际会议

会议名称: Energy Materials 2014(第一届能源材料国际会议)

会议地点: 西安

会议语种:英文

页码: 473-480

在线出版日期: 2014-11-04（万方平台首次上网日期，不代表论文的发表时间）