- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Single-step process of microstructural functionally graded Ti6Al4V by laser powder bed fusion additive manufacturing
摘要： The objectives of this study are: (1) to verify whether using linear heat input alone is sufficient to predict the resulting microstructure of Ti6Al4V and (2) to demonstrate the potential of single-step process of functionally graded material using powder bed fusion. In laser powder bed fusion, linear heat input is defined as the ratio of laser power to scan speed. It is a key process variable that describes the unit energy input. Therefore, linear heat input has been extensively linked with the resulting microstructure. However, review of existing studies shows that when similar linear heat input was used, a marked difference in mechanical properties exists. Using proportionally changed laser power and scan speed in five zones, functionally graded specimens were fabricated in this study. All other parameters remain the same for these zones. Variation of microstructure and hardness across the five zones were obtained. This implies that linear heat input is not sufficient to determine the resulting microstructure and mechanical properties. The amplitude of laser power and scan speed has an effect on the resulting microstructure, so they need to be separately considered in future studies.
关键词： Linear heat input,Functionally graded material,Ti6Al4V,Microstructure,Powder bed fusion
更新于2025-09-23 15:21:01
-
Eliminating the crack of laser 3D printed functionally graded material from TA15 to Inconel718 by base preheating
摘要： High quality manufacturing the functionally graded material (FGM) from TA15 to Inconel718 (IN718) has wide application prospects in the aerospace field. However, the crack always can be found in linear gradient structure of the FGM manufactured by laser 3D printing. In the present study, the crack-free FGM was fabricated by laser 3D printing via base preheating. The microstructure and mechanical properties were analyzed in detail to evaluate the mechanism that the preheating process prevented the formation of the crack. The microstructure of the unpreheated FGM presented that the crack mainly formed in the region between 60% and 80% IN718. Obviously, no cracks formed in the preheated sample because base preheating process made the level of internal stress to be below the yield strength. The tensile strength of the FGM with the preheating was 207 MPa. This is a noticeable improvement compared with that fabricated without the preheating, which could not be measured due to the formation of the crack. These research results indicate that the base preheating process can effectively prevent the formation of the crack during laser 3D printing FGMs from Ti- to Ni-based alloys.
关键词： Laser 3D printing,Functionally graded material,Crack,Microstructure,Preheating
更新于2025-09-23 15:19:57