形变TZM合金的拉伸性能和断口组织

The Stretch Property and Fractograph of Deformation TZM Alloy

采用粉末冶金方法制备出TZM合金并进行热轧处理,测试不同变形量TZM合金的拉伸性能,分析显微组织和断口形貌。结果表明,TZM合金无论变形与否拉伸断裂均含有沿晶脆性断裂;TZM合金随变形量的增加,加工态纤维组织增多,力学性能增强,断裂表现为由沿晶脆性断裂、解理断裂和穿晶解理断裂向沿晶韧性断裂和准解理断裂转变;随变形量的增加,TZM合金的碳化物相分散均匀、弥散度提高,晶界结合力增强,从而TZM合金的力学性能得以提高。

TZM alloy is prepared by powder metallurgy process, and through the hot-rolling treatment, then its tensile properties are tested and the microstructure and surface morphology of different deformation TZM alloy are analyzed. The results show that the grain boundary has had cleavage fracture, regardless of whether TZM alloy is deformation. The deformation of TZM alloy increases the fiber structure increases and mechanical properties are strengthened. The fracture of TZM alloy performance can display the transform from cleavage fracture, cleavage crack and brittle intergranular fracture to the intergranular ductile fracture and quasi-cleavage fracture. With an increase in the deformation, carbon phase of TZM alloy disperses homogeneously and with high dispersion degree, the adhesion of crystal boundary is stronger, and then the mechanical properties are improved.