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研究了激光立体成形Ti60合金的缺陷及微观组织对于性能的影响。结果表明,激光功率对于激光成形试样的微观组织有明显的影响,大激光功率会形成魏氏组织,小功率则会形成网篮组织。魏氏组织的持久性能显著的低于网篮组织,其表现为脆性沿晶断裂,而网篮组织则为韧性断裂。同时冶金缺陷也会影响其持久性能。采用气雾化法制备的粉末(粉末B)作为成形粉末在成形过程中会形成气孔,而采用旋转电极法制备的粉末(粉末A)则无气孔产生。相较于无气孔的试样(采用粉末A制备的试样),当存在气孔(采用粉末B制备的试样)时其高温持久性能会由100 h降至25 h。
The defects of laser three-dimensional forming Ti60 alloy and the influence of microstructure on the properties were studied. The results show that the laser power has a significant effect on the microstructure of the laser-formed samples. The large laser power will form the Weismann’s tissue, while the low-power will form the basket structure. Widget’s persistence was significantly lower than that of the baskets, which was characterized by brittle intergranular fracture, whereas baskets were ductile. At the same time metallurgical defects can also affect their long-term performance. The powder prepared by the gas atomization method (powder B) as a shaped powder will form pores during the forming process, while the powder (powder A) prepared by the rotating electrode method will have no pores. Compared to a non-porous sample (a sample prepared with powder A), the high temperature endurance decreases from 100 h to 25 h when pores (samples prepared with powder B) are present.