摘要
通过对V150钻杆材料进行不同缺口深度的缺口拉伸试验和缺口偏斜拉伸试验,研究了缺口深度对拉伸应变能、缺口敏感系数和拉伸断口形貌的影响,以及偏斜角度对缺口试样拉伸强度和塑性性能影响。结果表明:该V150钻杆材料在具有高强度、高韧性、高塑性的同时,具备良好的抗缺口脆化能力。缺口试样的抗拉强度随着缺口深度增加不断增大,缺口敏感系数均大于1,对缺口不敏感;随着缺口深度增加,断后伸长率、断后收缩率、断裂总应变能均逐渐下降;断口宏观形貌由切断型转变为正断型,微观形貌也由韧窝断口转变为韧窝和准解理复合断口;缺口深度为0.5mm时,偏斜角度加剧了缺口试样的脆化倾向,使其塑性逐渐降低;当缺口深度为0.8 mm时,断面收缩率大幅下降至15%~20%。
The effects of notch depth on the tensile strain energy, notch sensitivity coefficient and tensile fracture morphology, and the effects of notch angle on the tensile strength and plasticity of notched specimens were investigated through notch tensile tests and notch deflection tensile tests with different notch depths on V150 drill pipe material. The results show that V150 drill pipe material has strong resistance to notch embrittlement while having high strength, high toughness and high plasticity. The tensile strength of the notched specimens increase with the increase of notch depth, and the notch sensitivity coefficient is greater than 1, which is insensitive to notch;with the increase of notch depth, the post-fracture elongation, post-fracture shrinkage, and total strain energy of fracture decrease gradually;the macroscopic morphology of fracture change, from cut-off type to positive fracture type, and the microscopic morphology changes from tough fracture to tough fracture and quasi-dissociative composite fracture;when the notch depth is 0.5 mm, the skew angle intensifies the brittleness tendency of the notched specimen, which gradually decreases the plasticity, and when the notch depth is 0.8 mm,the fracture shrinkage decreases to 15%-20%.
作者
欧阳志英
舒志强
OUYANG Zhiying;SHU Zhiqiang(Shanghai Hilong Petroleum Tubular Goods Research Institute,Shanghai 200949,China)
出处
《热加工工艺》
北大核心
2022年第12期30-34,共5页
Hot Working Technology
基金
上海市优秀技术带头人计划资助项目(19XD1430400)。
关键词
V150高强度钻杆
缺口敏感性
偏斜拉伸
V-150 high strength drill pipe
notch sensitivity
slanting tensile
