摘要
采用Gleeble-3500热模拟试验机对快堆燃料组件包壳管用15-15Ti不锈钢的热塑性进行了研究,绘制了热塑性曲线,并对所有热拉伸试样断口及轴向金相组织进行了解剖分析。结果表明:在应变速率为1 s^-1、温度为900~1200℃时,15-15Ti不锈钢具有良好的高温热塑性,断面收缩率为82.2%~98.9%,温度为1150℃时达到最大;不锈钢在热拉伸试验过程均发生了明显的颈缩现象,且拉伸断口韧窝随温度的升高而增加、变深,当温度为1150℃时,韧窝最深,尺寸最大,温度达到1200℃时,韧窝仍然较深,尺寸略微减小;不锈钢热拉伸断口的动态再结晶比例随温度的升高而增大,在1000~1200℃时发生了完全动态再结晶。应变速率为1 s^-1时,15-15Ti不锈钢最佳的热加工温度为1000~1200℃。
The hot ductility of 15-15 Ti stainless steel for fuel assembly cladding tube of fast reactor was studied by Gleeble-3500 thermal simulation tester,the hot ductility curves was drawn,and the fracture and axial metallographic structure of all the tensile specimen were analyzed.The results showed that 15-15 Ti stainless steel had good hot ductility in the range of 900-1200℃ at strain rate of 1 s^-1,and the percentage reduction of area was 82.2%-98.9%,and reached the maximum at 1150℃.The obvious necking phenomenon occurd in the process of hot tensile test of stainless steel,and the pores and dimples of tensile fracture became more and deeper with the temperature increasing.When the temperature reached 1200℃,the dimple was still deep and the size slightly decreased,the dynamic recrystallization ratio of the tensile fracture of stainless steel increased with the increase of temperature,and complete dynamic recrystallization occurd at 1000-1200℃.When the strain rate was 1 s^-1,the optimum hot working temperature of 15-15 Ti stainless steel was 1000-1200℃.
作者
高佩
王锋
罗煦
GAO Pei;WANG Feng;LUO Xu(Technical Management Department,Jiangsu Yinhuan Precision Steel Tube Co.,Ltd.,Yixing 214203,Jiangsu,China;School of Materials Science and Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China)
出处
《金属功能材料》
CAS
2020年第5期33-37,共5页
Metallic Functional Materials
基金
江苏省高等学校自然科学研究面上项目(19KJB430001)。
关键词
燃料组件
包壳管
15-15Ti不锈钢
热塑性
动态再结晶
fuel assembly
cladding tube
15-15Ti stainless steel
hot ductility
dynamic recrystallization
作者简介
高佩(1982-),男,博士生,高级工程师,E-mail:gaopei003@163.com.cn。
