热处理制度对K417G铸造高温合金组织和性能的影响

Influence of Heat Treatment on Microstructure and Mechanical Properties of K417G Superalloy

对K417G合金经过“1080℃/4h,AC+870℃/12h,AC”固溶+时效热处理后的显微组织、性能进行了研究。结果表明,与铸态相比,经“1080℃/4 h,AC”固溶处理后,铸态部分γ′相已经溶解,并且初生γ′相附近聚集着尺寸更小的二次γ′相颗粒;室温抗拉强度和塑性提高,而900℃抗拉强度变化不大,塑性指标却明显降低。再经“870℃/12 h,AC”时效处理后,γ′相呈现为规则的立方形,二次γ′相有所长大,尺寸约为20~100 nm;900℃塑性指标有一定提升,其他力学性能与铸态相比变化不明显。

The microstructure and properties of K417G alloy after solution+aging heat treatment at 1080℃/4 h,AC+870℃/12 h,AC were studied.The results show that the secondaryγ′phase is precipitated in K417G after solution treatment,its tensile strength and plasticity at room temperature increases,but the plasticity property in high temperature decrease apparently.After aging at 870℃ for 12 h,theγ′phase became regular cubic shape,the size of the secondaryγ′phase particies tend to increase,up to 20-100 nm.Its plasticity property at 900℃ has improved,and other properties are equivalent with room temperature.