石油钻杆加厚端过渡区组织及力学性能分析  

Analysis of Microstructure and Mechanical Properties of Upset Transition Area for Oil Drill Pipe

作　　者：晏彬彬[1] 徐新成[2] 张亚龙[2] 赵旺初[1] 

机构地区：[1]上海工程技术大学材料工程学院,上海201620 [2]上海工程技术大学工程实训中心,上海201620

出　　处：《热加工工艺》2015年第11期150-151,154,共3页Hot Working Technology

基　　金：上海工程技术大学研究生科研创新专项(14KY0513);工程创新实践公共平台项目(nhjx-2014-11)

摘　　要：石油钻杆加厚端过渡区在加工过程中容易出现褶皱、表面粗糙等缺陷。利用光学显微镜分析了37Cr Mn Mo材料石油钻杆在镦锻前后过渡区的组织形貌,测试了硬度、冲击韧性和拉伸性能,同时对其金属流线进行了分析。结果表明,镦锻后钻杆的抗拉强度为950 MPa,屈服强度为840 MPa,硬度为34 HRC,冲击韧性为176 J;调质处理后钻杆材料晶粒细化且均匀紧密排列,无带状组织和夹杂物;镦锻后金属流线沿零件轮廓连续分布,能够提高钻杆径向抗拉强度和轴向抗剪切性能。The upset transition area of oil drill pipe easily produces defects of fold and rough surface in the processing.The microstructure of the upset transition area for 37 CrMnMo oil drill pipe before and after upset forging was analyzed by optical microscope. Hardness, impact toughness and tensile properties were tested. Meanwhile, the metal flow line was analyzed. The results show that the tensile strength is 950 MPa, the yield strength is 840 MPa, the hardness is 34 HRC and the impact toughness is 176 J after upset forging; the grains of oil drill pipe after hardening and tempering become smaller and arrange uniformly and compactly, which has no banded structure and inclusions; the metal flow line distributes continuously along the outline of part after upset forging, which can improve the radial tensile strength and the axial shear resistance of oil drill pipe.

关 键 词：石油钻杆 加厚端过渡区 显微组织 镦锻 

分 类 号：TG306[金属学及工艺—金属压力加工]