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Abstract In present work, the microstructure evolution of cobalt-base superalloy GH5605 before and after cold rolling was investigated and thermo-dynamic calculation was employed to investigate the cold deformation mechanism. The… Click to show full abstract
Abstract In present work, the microstructure evolution of cobalt-base superalloy GH5605 before and after cold rolling was investigated and thermo-dynamic calculation was employed to investigate the cold deformation mechanism. The results show that the microstructure after cold-rolling is characterized by a large number of long needle-shaped microtwins and e-martensite produced by strain induced martensite transformation (SIMT), which is much different from nickel-base superalloy. Hence, microtwin and SIMT are the major cold deformation mechanisms of GH5605. The calculation of stacking faults energy (SFE) shows that GH5605 has lower SFE than nickel-base superalloy and the low SFE of GH5605 can contribute to these mechanisms.
Journal Title: Materials Letters
Year Published: 2020
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