PDM直接成形GH163高温合金零件组织性能

Structure property of GH163 super alloy parts directly formed by PDM

通过测试比较等离子熔积成形工艺与真空精密熔模铸造所得GH163高温合金零件微观组织与力学性能,发现等离子熔积成形GH163高温合金零件具有良好的力学性能,特别在X-Y方向的常温、高温拉伸性能均超过真空精密熔模铸造10%,塑性提高近1倍,其高温持久寿命可延长40%左右.采用等离子熔积直接成形GH163高温合金零件的微观组织细小致密,成分均匀,偏析小,熔积层无分层、气孔、夹杂等缺陷,因此能够更好地适应航空要求.

Plasma deposition manufacturing （PDM） was compared with GH163 super alloy parts made by vacuum precision investment casting. It is found that the former has perfectly fine mechanical properties. Particularly the normal and high-temperature tensile performance is more than 10 %, the plasticity nearly doubled, these lead to the high temperature duration performance improve 40 % in the X- Y direction. Additionally, the microstructure of GH163 .super alloy parts made by PDM are perfectly fine and dense with unique composition uniformity and minimal segregation, and the deposition layers are metallurgical bonding which has no pores or impurity defects compared with the casting process, which enables better satisfaction to the requirements imposed by the aviation industry.