研究了K447A合金双性能整体叶盘的显微组织和力学性能.结果表明,叶盘的铸态组织均包括γ基体、MC型碳化物、γ/γ′共晶、γ′相和Ni5Hf相.随着固溶温度的升高(1185 ℃→1230℃),合金等轴晶和定向柱晶试样的抗拉强度和持久寿命提高;增加高温时效处理(1185℃/4h)可显著改善等轴晶的拉伸塑性和定向柱晶的持久寿命.热处理后,轮盘和叶片中的γ′相体积分数达到61％.碳化物发生“碎化”,且由γ′相包覆,同时沿晶界还析出了链状的MC型碳化物.切取性能测试结果表明,叶盘室温抗拉强度不小于987 MPa,760℃/724 MPa下的持久寿命不低于11.5 h.
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