Microstructure Evolution and Mechanical Properties of FeCrAl Alloy Pipes with Warm Rolling
FeCrAl alloy extruded tubes were two pass warm-rolled and annealed.The microstructure evolution and mechanical properties of FeCrAl alloy pipes during warm rolling and annealing were analyzed.The results show that during the warm rolling process of the FeCrAl alloy pipes with the studied composition,the large irregular particles with rich Nb,Ta,Mo elements crack and form microcracks,holes.The deformation during the warm rolling is nonuniform,in which the deformation near the outer surface is higher than that near the inner surface,and the hardening degree decreases from the outside to the inside.After annealing,the microstructure of warm-rolled pipes composed of recrystallized structure and deformed structure is nonuniform with the degree of recrystallization near the outer surface higher than that near the inner surface.Most of the recrystallization of one pass warm-rolled pipes is completed after annealing at 850℃/1 h.The tensile strength,yield strength and elongation are 679 MPa,469 MPa and 27.75%,respectively.Recovery and local recrystallization of two pass warm-rolled pipes is only completed after annealing at 800℃/1h because of insufficient annealing temperature,the elongation decreases,the tensile strength,yield strength and elongation are 725 MPa,571 MPa and 19.50%,respectively.
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