The Influence of Inhomogeneous Deformation on the Microstructures and Properties of Thick-Plate 7150 Alloy
The diversities and relations of microstructures and properties between the center and surface layer in thick-plate 7150 alloy were investigated by means of OM, TEM, SEM and tensile tests. The results indicated that the average width of elongated grains with fewer substructures in the center of hot-rolling thick plate is about 2 times larger than that in the surface layer. The coarser second phases are massed up at the grain boundaries of the center layer while those are crushed into smaller particles in the surface layer. By aging, the strengthening precipitates in the center are mainly GP zone and η' phase, while in the surface layer η' and η phases play the main roles. Consequently, the strength is about 80Mpa (15%) higher in the center than in the surface, with lower elongations (26% lower).
Yafang Han, Xuefeng Liu and Guanghong Lv
F. Zhao et al., "The Influence of Inhomogeneous Deformation on the Microstructures and Properties of Thick-Plate 7150 Alloy", Materials Science Forum, Vol. 749, pp. 250-254, 2013