电子束焊接对调质15CrMnMoVA高强钢组织及性能的影响

Effect of electron beam welding on microstructure and properties of quenched and tempered 15CrMnMoVA high strength steel

为实现高淬火倾向的航空高强钢材料的高质量接头,以15CrMnMoVA高强钢为研究对象,进行了电子束焊接工艺试验研究;针对不同结构的电子束焊接接头,分析了焊缝显微组织特征、焊接接头的显微硬度分布和力学性能,探讨了电子束焊接工艺对接头组织性能的影响。结果表明,15CrMnMoVA钢的焊缝中心形成了网篮状马氏体组织,其显微硬度为典型的马鞍形分布。不同锁底结构的电子束焊接接头的拉伸性能基本都与母材相当,但其疲劳性能差异明显,锁底长度为1.5 mm时焊接接头的疲劳性能较好。

In order to achieve high-quality joint of aviation high-strength steel with high hardening tendency,electron beam welding process was carried out with the 15CrMnMoVA high-strength steel as the research object.For the electron beam welding joints with different structures,the microstructure characteristics and microhardness distributions were analyzed,and the mechanical properties were tested and analyzed,and the effect of electron beam welding process on the microstructure and mechanical properties of the joint was discussed.The results show that net basket martensite is formed in the weld center of the tested steel,and its microhardness is a typical saddle distribution.The tensile properties of electron beam welded joints with different lock bottom structures are basically equivalent to that of the base metal,but their fatigue properties are obviously different.When the lock bottom length is 1.5 mm,the fatigue properties of welded joints are better.