摘要
采用搅拌摩擦焊对接工艺焊接厚度为2 mm的TA2-Q235B钛钢复合板。采用光学显微镜和扫描电子显微镜观察焊接接头显微组织及断口形貌,并采用拉伸试验机和显微硬度计测试焊接接头力学性能及不同区域的显微硬度。结果表明,钛钢复合板焊接接头从上到下分为上部钢焊接区,中部钛钢混合区及下部钛焊接区3个区域,其中钛钢混合区呈交替层叠状结构。当轴肩旋转速度为300 r/min,焊接速度为40 mm/min时,焊接接头的抗拉强度为386 MPa,达到母材强度的80%以上,焊接区域的硬度平均值为243.5 HV,焊接接头断裂源于结合较弱的前进侧热机影响区域。
The TA2-Q235B titanium/steel composite plate with 2 mm thickness was welded by friction stir welding in butt joint.Optical microscope and scanning electron microscope were used to observe microstructure and fracture morphology of welded joints.Tensile testing machine and microhardness tester were adopted to test mechanical properties of welded joints and microhardness in different areas.The results showed that the welded joint of the titanium/steel composite plate was divided into three areas from top to bottom,namely the upper steel welding zone,the middle titanium/steel mixed zone and the lower titanium welded zone.The titanium/steel mixed zone had an alternately stacked microstructure.When the shaft shoulder rotation speed was 300 r/min and the welding speed was 40 mm/min,the tensile strength of the welded joint was 386 MPa,which was 80%of that of the base metal.The average hardness of the welded area was 243.5 HV.The fracture originated from the heat engine affected area on the forward side where the bond was weak.
作者
曹志明
武晓燕
江海涛
仲彬彬
Cao Zhiming;Wu Xiaoyan;Jiang Haitao;Zhong Binbin(University of Science and Technology Beijing,Beijing 100083,China)
出处
《焊接》
北大核心
2021年第2期1-8,62,共9页
Welding & Joining
基金
中央高校基本科研业务费(FRF-TP-19-083A1)
航空科学基金项目(20181174001)。
关键词
钛钢复合板
搅拌摩擦焊
显微组织
力学性能
titanium/steel composite plate
friction stir welding
microstructure
mechanical properties
