STUDY OF A NEW-TYPE HIGH STRENGTH Ni--BASED SUPERALLOY DZ68 WITH GOOD HOT CORROSION RESISTANCE
LIU Enze 1; 2; SUN Shunchen 1; TU Ganfeng1; ZHENG Zhi2; NING Likui2; ZHANG Lingfeng 3
1. School of Materials and Metallurgy; Northeastern University; Shenyang 110004
2. Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016
3. AVIC Xi'an Aero--Engine (Group) Ltd.; Xi'an 710021
Cite this article:
LIU Enze SUN Shunchen TU Ganfeng ZHENG Zhi NING Likui ZHANG Lingfeng . STUDY OF A NEW-TYPE HIGH STRENGTH Ni--BASED SUPERALLOY DZ68 WITH GOOD HOT CORROSION RESISTANCE. Acta Metall Sin, 2009, 45(10): 1217-1224.
In order to meet the requirements of marine gas turbine blade materials, a new–type directional solidification Ni–based superalloy named DZ68 was developed. The alloy composition was designed by low segregation technology. Its nominal chemical composition (mass fraction, %) is C
0.05, Cr 12.0, Mo 1.0, W 5.0, Co 8.5, Al 5.3, Ti 0.5, Ta 5.0, Re 2.0, B 0.01, and balance is Ni. The microstructures of as–cast DZ68 alloy and after heat treatment states were analyzed by OM, SEM and XRD. The tensile, rupture and hot corrosion resistance properties of DZ68 alloy were compared with
DZ125 and IN738 alloys. Results show that the microstructure of as–cast DZ68 alloy is composed of γ, γ', (γ+γ') eutectics, MC type carbides and a few borides. After heat treatment, the microstructureof DZ68 alloy is composed of γ, γ' and carbides. The carbides are mainly MC and M23C6. The tensile strength of DZ68 alloy decreases slightly with the increase of temperature, and reaches its minimum value at 700℃. When the temperature is higher than 700℃, the tensile stregth increases so evidently that reaches its maximum t oce at 760 ℃, But whethe temperature is higher than 760 ℃its tensile strength decreases obviously. It is well recognized the relatioship of the tensile strength of DZ68 alloy with temperature is abnormal, similar to that of its yield strength but oposite to that of its plasticity. The tensile and rupture properties of DZ68 alloy are nearly the same as those of DZ125 alloy and its hot corrosion resistance property is nearly the same as that of IN738 alloy under the same conditions.
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