Evolution Rules of Microstructure and Mechanical Properties of GH605 Strip during Heat Treatment

The microstructure, grain orientation and mechanical property of GH605 strip after different heat treatment processes were observed by optical microscope, XRD and tensile tester.The results show that, a large number of carbides are distributed irregularly in the cold rolled GH605 strip. After 900 ℃/continuous annealed, the carbides begin to dissolve and sub-boundaries appear.After continuous annealed and water quenched at 1180 ℃, the carbides are completely dissolved, and the strip is recrystallized completely, along with a large number of twins appears. Furthermore, the texture of the cold rolled GH605 strip is the weakest after 900 ℃/continuous annealed, and there is no major texture. With continuous annealed and water quenched at 1180 ℃, the texture strength increases and the main texture changes to 110< 001>.With the increase of heat treatment temperature, the strength of GH605 strip decreases and the plasticity improves. Moreover, the strip by continuous annealed at 1180 ℃has the best comprehensive properties of strength and plasticity.