Tolvanen Sakari, Pederson Robert, Klement Uta
Department of Industrial and Materials Science, Chalmers University of Technology, SE-41296 Gothenburg, Sweden.
Department of Engineering Science, University West, SE-46186 Trollhattan, Sweden.
Materials (Basel). 2024 Feb 6;17(4):782. doi: 10.3390/ma17040782.
The effect of defects and microstructure on the mechanical properties of Ti-6Al-4V welds produced by tungsten inert gas welding; plasma arc welding; electron beam welding; and laser beam welding was studied in the present work. The mechanical properties of different weld types were evaluated with respect to micro hardness; yield strength; ultimate tensile strength; ductility; and fatigue at room temperature and at elevated temperatures (200 °C and 250 °C). Metallographic investigation was carried out to characterize the microstructures of different weld types, and fractographic investigation was conducted to relate the effect of defects on fatigue performance. Electron and laser beam welding produced welds with finer microstructure, higher tensile ductility, and better fatigue performance than tungsten inert gas welding and plasma arc welding. Large pores, and pores located close to the specimen surface, were found to be most detrimental to fatigue life.
在本研究中，探讨了缺陷和微观结构对采用钨极惰性气体保护焊、等离子弧焊、电子束焊和激光束焊所制备的Ti-6Al-4V焊缝力学性能的影响。针对不同焊缝类型的力学性能，在室温以及高温（200℃和250℃）条件下，从显微硬度、屈服强度、抗拉强度、延展性和疲劳性能等方面进行了评估。开展金相研究以表征不同焊缝类型的微观结构，并进行断口分析以关联缺陷对疲劳性能的影响。结果表明，与钨极惰性气体保护焊和等离子弧焊相比，电子束焊和激光束焊所产生的焊缝具有更精细的微观结构、更高的拉伸延展性以及更好的疲劳性能。发现大尺寸气孔以及位于试样表面附近的气孔对疲劳寿命最为不利。
