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在一种含5%Re(质量分数)和3%Cr的镍基单晶高温合金基础上,研究再添加Cr后合金组织的变化。实验结果表明:随着Cr含量的增加,合金铸态组织中元素偏析加重,共晶体积分数增加,固相线和液相线温度显著降低。此外,完全热处理态组织中γ′尺寸和体积分数都减小。X射线衍射分析结果表明,Cr的添加使γ/γ′点阵错配度变得更负。从能量色散谱仪的结果可知,Cr主要分布在γ基体中,并且随着Cr含量的增加,更多的γ基体形成元素(如Re和W等)进入γ基体中,但Cr在γ/γ′中的分配比却减小。
Based on a Ni-based single crystal superalloy containing 5% Re (mass fraction) and 3% Cr, the change of the alloy structure after addition of Cr was studied. The experimental results show that with the increase of Cr content, the element segregation aggravates and the eutectic volume fraction increases, and the solidus and liquidus temperature decrease significantly. In addition, the γ ’size and volume fraction in fully-heat-treated tissue both decreased. X-ray diffraction analysis results show that the addition of Cr makes the γ / γ ’lattice mismatch more negative. From the results of the energy dispersive spectrometer, Cr is mainly distributed in the γ matrix, and more elements of the γ matrix (such as Re and W, etc.) enter the γ matrix as the Cr content increases. However, ’In the distribution ratio is reduced.