一种新型定向凝固高温合金DZ142的研究(英文)

Study of a Novel DS Superalloy DZ142

研究了一种新型定向高温合金DZ142的微观组织,测定了DZ142合金持久性能、抗氧化性能、抗热腐蚀性能并与DZ125L合金进行比较。结果表明:热处理后的DZ142合金组织主要由γ、γ′、(γ+γ′)共晶和MC型碳化物组成;经长期时效处理,合金时效组织中未见有害的TCP相,碳化物类型仍为MC型。DZ142合金的持久性能,高温抗氧化性能和抗热腐蚀性能都优于DZ125L合金。

A novel DS superalloy DZ142 was developed in order to maximize the longitudinal rupture strength while retaining acceptable ductility with good environmental properties. The microstructure, the creep rupture, the hot corrosion and the oxidation resistance of DZ142 alloy were studied by scanning electron microscopy,optical microscopy and X-ray diffraction. The results indicate that the microstructure of the alloy after heat treatment are composed of γ, γ ,（γ＋γ ） eutectic and carbides. After long term aged, DZ142 alloy exhibits good microstructure stability without deleterious TCP phases and the carbide is still of MC type. The creep rupture, the hot corrosion and the oxidation resistance of DZ142 alloy is better than those of DZ125L alloy