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DZ951 directionally solidified nickel-base superalloy is mainly strengthened byγphase.Regularly aligned cuboidal and bimodalγprecipi- tates were attained by two heat treatments.The effect of microstructure on the mechanical properties of DZ951 alloy has been investigated. The results indicate that MC carbide changes to tittle blocks during aging treatment at 1050℃(HT1).MC carbide partly degrades into M_(23)C_6 and there is a layer ofγaround the carbide during aging treatment at 1150℃(HT2),which is beneficial to the elongation of DZ951 alloy. Smallγvolume fraction and the uneven deformation structure are contributed to low mechanical properties of the as-cast alloy.HT1 alloy has a better stress rupture life at 1100℃/50 MPa and yield stress at 20℃,800℃and 1100℃,which is attributed to regularly aligned cuboi- dalγphase and even deformation structure.HT2 alloy has a good combination of strength and ductility.This arises from the bimodalγprecipitates and the degeneration of MC carbide.
DZ951 directionally solid bonded nickel-base superalloy is mainly enhanced by γphase. Regular results of aligned cuboidal and bimodalγprecipi- tates were attained by two heat treatments. The effect of microstructure on the mechanical properties of DZ951 alloy has been investigated. The results indicate that MC carbide changes to tittle Blocks during aging treatment at 1050 ° C (HT1). MCElementically degraded into M_ (23) C_6 and there is a layer of γaround the carbide during aging treatment at 1150 ° C (HT2), which is beneficial to the elongation of DZ951 alloy. fraction and the uneven deformation structure are contributed to low mechanical properties of the as-cast alloy. HT1 alloy has a better stress rupture life at 1100 ° C / 50 MPa and yield stress at 20 ° C, 800 ° C and 1100 ° C, which is attributed to regularly aligned cubo-dalγphase and even deformation structure. HT2 alloy has a good combination of strength and ductility.This arises from the bimodal γprecipitates and the degeneration o f MC carbide.