Ti6Al4V合金整体叶盘热等静压近净成形研究

Near-Net-Shaping Hot Isostatic Pressing of Ti6Al4V Alloys Monolithic Bladed Disks

摘要:

本研究结合模具工艺与热等静压方法，整体近净成形出了复杂叶盘零件，并对模具变形、成形精度以及组织性能进行系统分析。结果表明，整体近净成形叶盘相对致密度达到99.5%。SEM结果显示：零件内部为均匀细小的α+β长条状组织，无明显孔隙和裂纹；组织致密，微观组织出现“分层”现象；同炉拉伸件抗拉强度可达920 MPa，性能优于同规模铸件，与锻件性能相当；分析断口微观形貌得出试样为韧性断裂；该方法成形零件材料利用率高，工艺成本低，成形周期较长。本研究为叶盘类零件热等静压近净成形提供了参考依据

Abstract:

This study combines the mold process with the hot isostatic pressing method, and the complex monolithic bladed disks are formed by near-net-shaping. Based on this, it gives a scientific analysis of the mold deformation, forming precision and structure property. The results show that the near-net-shaped monolithic bladed disks have a relative density of 99.5%. The SEM results indicate that there is fine and homogeneous strip α+β phase in the parts, with no obvious pores and cracks. Besides, the structure is compact, and the "layered" phenomenon appears in the microstructure. The tensile strength of parts in the same furnaces can reach 920 MPa, which is better than that of the same size castings, and as same as that of the forgings. The fracture morphology analysis suggests that the sample has a ductile fracture. The HIP method has a high material utilization, which can reduce the process costs, and the molding cycle is longer. This study provides a reference to the near-net-shaping hot isostatic pressing for the bladed disk parts