抽油杆用非调质钢摩擦焊的组织与力学性能

Microstructure and Mechanical Properties of Friction Welded Joint of Non-Quenched and Tempered Steel Used for Sucker Rod

以材料型超高强度抽油杆用钢FG - 2 0为研究对象 ,进行了摩擦焊工艺参数与接头力学性能关系的研究和探讨。以便为采用摩擦焊工艺生产制造超高强度抽油杆提供理论依据和实用工艺参数。试验采用正交试验结合相关力学性能评定和组织分析 ,确定了摩擦焊主要工艺参数的适用范围和优化方向。结果表明 ,由于FG - 2 0钢强度高 ,与其它钢材比较 ,应采用较小的摩擦工进速度和较大的顶锻压力 ;另外 ,对于FG -2 0钢 ,由于摩擦焊过程中 ,热影响区组织性能发生变化 ,因此采用焊后局部回火处理用以改善接头力学性能是非常必要的。

In order to provide theoretical foundation and practical technological parameters for used for friction welding super strength sucker rod,the relationship between friction welding technological parameters and joint mechanical properties of FG 20 steel used for super strength sucker rod was investigated .With orthogonal testing,mechanical property testing and microstructure analysis,the applicable range and optimized direction of the main technological parameters for friction welding were determined.Because FG 20 steel has high tensile strength,compared with normal steel,lower welding velocity and larger upset pressure should be adopted.In addition,during the friction welding process ,the microstructures and mechanical properties of FG 20 steel HAZ have been changed, so it is special essential to have postweld tempering heat treatment for improving joint mechanical properties.