EB-PVD制备Ni-20.3Cr-4.6Co-2.1Al薄板力学性能研究

Research on Mechanical Properties of Ni-20.3Cr-4.6Co-2.1Al As-deposited Sheet Prepared by EB-PVD

对采用电子束物理气相沉积(EB-PVD)技术制备Ni-20.3Cr-4.6Co-2.1Al高温合金薄板制备态的力学性能进行了研究。结果表明:制备态合金薄板常温(25℃)拉伸和高温(800℃)拉伸强度,后者比前者明显降低,但伸长率显著提高。常温和高温拉伸宏观断口形貌呈现裂纹瞬断区和裂纹扩展区两个不同的断裂区域。断裂区域均呈现明显的韧窝特征,其形态、大小以及数量有所差别,断裂方式为微孔聚集型和穿晶断裂的混合型。微区平面残余应力表明,制备态合金薄板基板面和沉积面残余应力均为拉应力,且沉积面的拉应力高于基板面。

The mechanical properties of as-deposited Ni-20.3Cr-4.6Co-2. 1Al sheet preprared by Electron Beam Physical Vapor Deposition （EB-PVD） was studied. The results show that the tensile strength at elevated temperature （800 ℃） decreases significantly than at room temperature （25 ℃ ）, but the elongation increases much more than at room temperature （25 ℃ ）. The fracture morphology of tensions at room temperature （25 ℃ ） and elevated temperature （800 ℃ ） appears obvious instant rupture zone and crack propagation zone. Two fracture zones possess the characteristic of dimple, but are different from shapes, dimension and amounts, the fracture modes are mixed by aggregated micropores and transgranular fracture. The residue stress on the microzone indicates that the residual stress on the substrate and deposited plane are tensile stress, and the residual stress of as-deposited plane is higher than the substrate.