高氮钢电子束焊接接头组织与性能分析

摘要

高氮钢焊接技术的研究是高氮钢研制和应用的关键技术之一.采用真空电子束焊接方法,对4mm厚的高氮钢进行了焊接,研究了焊接接头的组织和力学性能.研究结果表明高氮钢电子束焊接焊缝和热影响区的组织为奥氏体组织,当焊接束流为20 mA、焊接速度为6.5 mm/s时,接头抗拉强度最大为1 010 MPa,达到母材强度的92.7％.高氮钢电子束焊焊缝中氮逸失较少,氮含量下降不多,由0.74％下降到0.64％.%The study of welding technology mainly aims at the development and application of high nitrogen steel.Electron beam welding (EBW) is used to weld 4 mm thick high nitrogen steel plate.Microstructure and mechanical properties of EBW welded joints are studied.Experiment results indicate that the use of EBW on high nitrogen steel can significantly reduce common defects occuring in the traditional welding,its joint strength reachs 92.7％ of the parent metal strength.The experiment indicates that the nitrogen content in the joint is 0.64％,the microstructure of the welding metal is composed of single-phase austenitic organization.σ-Fe is not found in the welding metal and HAZ(hest affected zone).