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对新型第3代粉末高温合金母合金、等离子体旋转电极法生产(PREP)粉末和热等静压态合金中的微量元素Hf,Zr和Ta的存在相进行了研究。结果表明:母合金中微量元素Hf,Zr和Ta主要以一次MC型碳化物存在,呈块状、条状和蝶状分布于枝晶间;原始粉末中碳化物大致可分为两类:一类为富Ti,Ta和Nb,另一类为含有Ta,Hf和Zr,两类碳化物均含有一定量非碳化物形成元素Co和Ni及弱碳化物形成元素Cr和Mo,以块状、粒状分布于枝晶间或胞晶间。另外,热等静压态分析表明,微量元素Hf,Ta和Zr主要以晶内和晶界MC型碳化物存在,说明微量元素Hf,Zr和Ta以MC型碳化物存在并具有一定遗传性的特点。与原始粉末相比,热等静压态γ′相和碳化物中的Ta量比较少。
The existence phases of the trace elements Hf, Zr and Ta in the new third generation powder superalloy mother alloy, PREP powder and the hot isostatic pressing alloy were studied. The results showed that the trace elements Hf, Zr and Ta in the mother alloy mainly exist as MC type carbides, and are in the form of lumps, stripes and butterflies distributed in the dendrites. The carbides in the raw powders can be divided into two types: one Class is rich in Ti, Ta and Nb, and the other is containing Ta, Hf and Zr, both types of carbides contain a certain amount of non-carbide forming elements Co and Ni and weak carbide forming elements Cr and Mo, Granular distribution in the interdendritic or intergranular. In addition, HIP analysis shows that the trace elements Hf, Ta and Zr exist mainly in the intragranular and intergranular MC type carbides, indicating that the trace elements Hf, Zr and Ta exist as MC type carbides and have some hereditary Features. Compared with the original powder, the amount of Ta in the hot-isostatic pressure γ ’phase and the carbide is relatively small.