摘要
利用CO2激光器对双金属带锯条齿部用高速钢钢丝M42及背部用高强度钢带X32进行焊接,通过金相显微镜,扫面电镜(SEM),显微硬度仪,电子探针(EPMA)等手段研究了焊后高速钢M42与高强度钢X32焊接接头组织演变规律,焊接接头合金元素分布,以及不同焊接工艺对异种金属焊接接头组织及力学性能的影响.研究表明:随着焊接速度的增大,焊缝中心区等轴晶增多,树枝晶减少,且靠近M42侧熔合边界区的等轴晶更细小;各种工艺条件下焊接接头硬度均较母材高,且靠近M42侧的熔合区的硬度要高于焊缝区的硬度.当焊接功率为2754W,焊接速度为14m/min时,焊接接头的性能优良,抗弯强度值达到112MPa,达到了双金属带锯条的焊接性要求.
High-speed steel wires M42 and high strength steel strips X32 were welded on the band saw blade by using CO2 laser.The typical microstructure of welding joints,the distribution of elements,and the influence of different bonding technologies on welding joints rnicrostructure and mechanical properties were studied by using metalloscope,electron microscope（SEM）,microhardness meter and electron probe（EPMA）.The results showed that isometric increased,dendrite decreased in the weld center and isometric near the side of M42 fusion boundary area became more fine with the increase of welding speed.The hardness of the welding joints in every bonding technology was higher than parent metal.Moreover,the hardness of the bond area near the side of M42 was higher than the welded zone＇s.When the welding power was 2 754 W and the welding speed was 14 m/min,the property of the welded joints was good,and the value of bending strength reached 112 MPa,which reached the requirements of double metal band saw blade welding.
出处
《湖南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第11期89-95,共7页
Journal of Hunan University:Natural Sciences
基金
国家自然科学基金资助项目(51274092)
关键词
高速钢
异种金属焊接
显微组织
力学性能
high speed steel（HSS）
dissimilar metal welding
microstructure
mechanical properties
