摘要
借助静态液压万能试验机和低温试验箱,研究了钻杆钢在不同温度下的强度变化规律,同时用扫描电镜及透射电镜研究了钻杆钢的显微组织及拉伸断口形貌。结果表明:随着温度的降低,钻杆钢的屈服强度和抗拉强度均呈增加趋势,屈强比呈下降趋势。随着钻杆钢级的提高,材料的抗拉强度温度敏感系数q_b和屈服强度温度敏感系数q_s均呈明显的减小趋势,但它们的比值呈明显的增加趋势。抗屈温度敏感系数比k(抗拉强度与屈服强度温度敏感系数比值)可用来表征温度对材料的力学性能的影响,k值越大,随着温度降低,相比屈服强度,抗拉强度提高更快,材料低温综合力学性能越好。在本文研究的温度范围内,随着温度的降低,钻杆钢的断口始终保持为延性断裂特征,这与材料塑性没有随温度降低而显著降低是一致的。
The strength variation of drill pipe steels at different temperatures was studied by means of static hydraulic universal testing machine and cryogenic test box, and microstructure and tensile fracture morphology of the drill pipe steels were studied by means of scanning electron microscopy and transmission electron microscopy. The results show that with the decrease of temperature, the yield strength and tensile strength of the drill pipe steels increase, and the yield ratio decreases. With the increase of the strength of the drill pipe steel, the tensile strength temperature sensitive coefficient q_b and the yield strength temperature sensitive coefficient q_s of the steels are obviously decreased, while their ratio is obviously increased. Tensile strength and yield strength temperature sensitive coefficient ratio k can be used to characterize the effect of temperature on the mechanical properties of the steels. The larger the value k is, the faster the tensile strength increases compared with the yield strength, and the better the comprehensive mechanical properties of the steels at low temperature is. In the temperature range studied in this paper, with the decrease of temperature, the fracture surface of the drill pipe steels always remains ductile fracture characteristics, which is consistent with the material plasticity not significantly decreasing with temperature decreasing.
作者
许天旱
丁一明
林宏
蔡炎桥
雷志胜
XU Tian-han;DING Yi-ming;LIN Hong;CAI Yan-qiao;LEI Zhi-sheng(School of Materials Science and Engineering,Xi’an Shiyou University,Xi’an 710065,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2020年第10期95-102,共8页
Transactions of Materials and Heat Treatment
基金
石油管材国家重点实验室资助项目(223117007)
中国石油天然气集团公司科学研究与技术开发项目(2016-A3905)
陕西省创新能力支撑计划项目(2017KJXX-01)
西安石油大学《材料科学与工程学院》省级优势学科
研究生创新与实践能力培养项目(YCS19112031)。
关键词
超高强度钻杆钢
屈服强度
抗拉强度
温度敏感系数
断口形貌
ultra-high strength drill pipe steel
yield strength
tensile strength
temperature sensitive coefficient
fracture morphology
