In order to meet the requirements of marine gas turbine blade materials, a new-typed directional solidification nickel-base superalloy DZ68 alloy was developed. So DZ68 alloy should have high temperature capability and good hot corrosion resistance. On the basis of Rene' 142, DZ125L and DZ38G (IN738) alloys, DZ68 was made by ourselves with low-segregation. The segregating lightlyγ'- phase forming elements of AI and Ta are added into DZ68 for precipitation hardening, this alloy has a small amount of Ti and ...