Title :
High temperature aging behavior of high strength 49%Co-1.9%V-0.3%Nb-Fe soft magnetic alloy
Author :
Masteller, M.S. ; Bowman, J.W. ; Li, Lin
Author_Institution :
R&D Center, Carpenter Technol. Corp., Reading, PA, USA
fDate :
9/1/1996 12:00:00 AM
Abstract :
The magnetic and mechanical properties of 19%Co-1.9%V-0.3%Nb-Fe high strength (σy=90 ksi) soft magnetic alloy were studied after aging at 450°C for up to 800 h. The magnetic induction B (Hm=10 and 25 Oe respectively) decreases rapidly in the first 100 h and approaches a lower limit at about 300 h. The coercive field remains constant during aging. Tensile specimens aged for 200 h at 450°C did not show any changes in the room temperature yield stress and elongation. Transmission electron microscopy identified two precipitate phases: NbC and a Laves phase (hcp. a=4.7 Å, c=7.72 Å). The Laves phase appears in grain boundaries and triple-points and inhibits the grain growth therefore enhancing the mechanical properties
Keywords :
ageing; cobalt alloys; coercive force; electromagnetic induction; elongation; ferromagnetic materials; grain boundaries; grain growth; iron alloys; mechanical strength; niobium alloys; precipitation; soft magnetic materials; transmission electron microscopy; vanadium alloys; yield stress; 0 to 800 hour; 450 degC; Co-V-Nb-Fe; Laves phase; TEM; coercive field; elongation; grain boundaries; grain growth; high strength soft magnetic alloy; high temperature aging behavior; magnetic induction; magnetic properties; mechanical properties; precipitate phases; room temperature yield stress; tensile specimens; triple-points; Aging; Annealing; Grain boundaries; Magnetic properties; Mechanical factors; Soft magnetic materials; Strips; Temperature; Tensile stress; Transmission electron microscopy;
Journal_Title :
Magnetics, IEEE Transactions on
