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研究了热处理制度对一种Fe-25Ni-12Cr基高Ti/Al比变形高温合金晶界析出和力学性能的影响。结果表明,直接时效热处理条件下,热加工应力不能得到有效消除,合金的变形带密集,晶界能量较高,促进η相沿晶界析出和生长;η相两侧存在细γ’相析出薄层,该薄层可有效抑制持久晶界裂纹的萌生和扩展,显著提高持久寿命,降低拉伸屈服强度。1000℃固溶+时效处理可有效消除加工应力及变形带,降低η相的晶界形核率,并促进η相魏氏体生长,有助于提高拉伸强度,但降低持久寿命。
The effect of heat treatment on grain boundary precipitation and mechanical properties of a Fe-25Ni-12Cr-based high Ti / Al superalloy was studied. The results show that the thermal processing stress can not be effectively eliminated under the direct aging heat treatment. The deformation zone of the alloy is dense and the grain boundary energy is higher, which promotes the precipitation and growth of the η phase along the grain boundary. The thin γ ’ , The thin layer can effectively inhibit the permanent grain boundary crack initiation and expansion, significantly improve the long-life and reduce the tensile yield strength. The solid solution + aging at 1000 ℃ can effectively eliminate the processing stress and deformation zone, reduce the nucleation rate of η phase grain boundaries and promote the growth of η-phase Wetstein, which will help to improve the tensile strength but reduce the long-term life.