316L不锈钢管的膨胀性能  

Expansion Property of 316L Stainless Steel Pipe

作　　者：张仁勇[1,2] 王霞[3] 施岱艳[1,2] 陈勇彬[1,2] 鞠岚[1,2] 张金钟[1,2] 

机构地区：[1]中国石油集团工程设计有限责任公司西南分公司,成都610041 [2]中国石油天然气集团公司石油管工程重点实验室酸性气田管材腐蚀与防护研究室,成都610041 [3]西南石油大学,成都610500

出　　处：《材料工程》2014年第6期79-83,共5页Journal of Materials Engineering

摘　　要：采用自上而下的膨胀工艺,对316L不锈钢管进行9%的径向膨胀实验,对比膨胀变形前后的力学性能。研究结果揭示了316L不锈钢管的膨胀特性:管材的长度减小了约3.6%,壁厚减小了4.4%左右,不均匀变形程度增加;由于加工硬化,管材的布氏硬度和抗拉强度明显增加,断后伸长率和断面收缩率出现大幅度下降。断口形貌表明膨胀前后的316L不锈钢管均属于韧性断裂,膨胀前试样断口以韧窝为主,部分韧窝呈撕裂状,而且出现明显的蛇形滑动现象;膨胀后试样断口的韧窝变小变浅,大部分蛇形滑动现象消失。The radial expansion experiment of 316L stainless steel pipe with 9% expansion ratio was performanced by top-down expandable craft,and contrasted with the mechanical property before and after the expandable deformation.The results show that the characteristics of 316L stainless steel pipe,including about 3.6% of the length decreases,4.4% of the wall thickness reduction,and the degree of uneven deformation aggravates.The Brinell hardness and tensile strength increase obviously,but the elongation and the reduction in cross area of 316L stainless steel pipe all decline conspicuously because of work hardening.The fracture morphology indicates the fracture mechanism of 316L stainless steel pipe before and after the dilation is ductile fracture.The fractograph of specimen exhibits typical ductile dimples and a portion of them appear lacerate,the serpentine sliding phenomenon intersperses on it.The ductile dimples of test sample change smaller and shallower after expandable deformation,most of the serpentine sliding phenomenons vanish.

关 键 词：可膨胀管 316L不锈钢管 膨胀性能 

分 类 号：TE93[石油与天然气工程—石油机械设备]