Tensile fracture behavior and texture evolution of a hot-rolled W-Y2(Zr)O3 alloy

A W-0.4wt% Y-2(Zr)O-3 (WYZ) alloy plate with superior mechanical properties and improved high-temperature stability was prepared by hot rolling. The tensile properties of WYZ alloys with different orientations and recrystallization states were investigated at a temperature range from room temperature (RT) to 500 degrees C. The texture intensity of the original WYZ alloy was weak, but it was significantly enhanced after annealing. The initial recrystallization temperature of the WYZ alloy was approximately 1400 degrees C. After recrystallization annealing, the strength of the WYZ alloy decreased significantly, but it showed an increased ductility. The ultimate tensile strength and fracture elongation of the samples along the rolling direction (RD) were always significantly higher than those of the samples along the transverse direction (TD). Orientation and annealing had no evident effect on ductile-to-brittle transition temperature (DBTT) from tensile data, but increasing strain rate would overestimate DBTT. The DBTT of the WYZ alloy from tensile data was approximately between 200 degrees C and 300 degrees C. With the increase in tensile test temperature, the strengths of alpha- and gamma-fiber textures on the side of fracture surface increased significantly. The increase in alpha- and gamma-fiber texture contents was beneficial to ductility enhancement in the WYZ plate. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

An investigation into the tensile properties of WYZ alloys with different orientations and recrystallization states at high temperatures showed that recrystallization annealing increased ductility but decreased strength. Orientation and annealing had no significant effect on ductile-to-brittle transition temperature (DBTT) from tensile data, although increasing strain rate would overestimate DBTT.