ZHANG Ren-yong1,2, WANG Xia3, SHI Dai-yan1,2, CHEN Yong-bin1,2, JU Lan1,2, ZHANG Jin-zhong1,2
1. Southwest Company, China Petroleum Engineering Co., Ltd., Chengdu 610041, China;
2. Department for Tubular Goods Corrosion and Protection in Sour Oil and Gas Fields, Key Laboratory of Petroleum Tubular Goods Engineering, CNPC, Chengdu 610041, China;
3. Southwest Petroleum University, Chengdu 610500, China
Abstract：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.
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2014, Vol. 0 
