Influence of Second Phase Particles on Recrystallization in Fe-36Ni Alloy

Evolution of Microstructure, Mechanical Properties and Residual Stress of a Cold Rolled Invar Sheet Due to Heat Treatment

“…The stress strain curves of all the specimens are sho that the curves for the specimens annealed at 400 °C a curve for the cold-rolled specimen. This indicates that as a negligible level of recovery, took place when annea of recrystallization is understandable, since the recryst typically above 650 °C, depending on the cold rolling dence of recovery in terms of hardness may occur abov ing on the cold rolling reduction [19], which explains w ery in terms of tensile strength was observed for the specimen annealed at 700 °C experienced a small decre moderate increase in ductility (Figure 5). Together wit served in Figures 1 and 2, this strength-ductility tradeery in which dislocation rearrangement and annihilati nealed at 800 °C was partially recrystallized.…”

“…This indicates that a lack of recrystallization, as well as a negligible level of recovery, took place when annealed for 35 s under 500 • C. The lack of recrystallization is understandable, since the recrystallization temperature of Invar is typically above 650 • C, depending on the cold rolling reduction [18]. Furthermore, evidence of recovery in terms of hardness may occur above 600 • C for Invar alloys, depending on the cold rolling reduction [19], which explains why no notable indication for recovery in terms of tensile strength was observed for the specimen annealed at 500 • C. The specimen annealed at 700 • C experienced a small decrease in strength, accompanied by a moderate increase in ductility (Figure 5). Together with the lack of recrystallization observed in Figures 1 and 2, this strength-ductility trade-off is a strong indication of recovery in which dislocation rearrangement and annihilation takes place.…”

“…It is known that the underlying factors that contributes to changes in the mechanical properties of a material can readily affect the residual stress of the material. In particular, heat treatment based metallurgical processes such as recovery and recrystallization can not only change the mechanical properties of an alloy, but also release residual stress in the alloy [16][17][18][19][20][21][22]. However, unwary heat treatment should be avoided because these processes, which are central to the alleviation of cold rolling induced residual stress in Invar sheets, can result in undesirable changes in the microstructures and mechanical properties of the sheets.…”