在温度1 050~1 200℃，时间10~90 min下对GH984G合金冷轧无缝管试样进行固溶处理，研究了固溶处理对合金组织和硬度的影响。结果表明：冷轧态合金晶粒沿轧向拉长，晶界及晶内析出第二相颗粒；不同条件固溶处理后，合金中形成等轴晶组织，随着温度的升高和保温时间的延长，晶粒尺寸增大，第二相数量减少；合金的晶界迁移表观激活能随保温时间的延长而增大，动力学时间指数随温度的升高先增大后减小；合金硬度随固溶温度的升高和保温时间的延长而降低，与平均晶粒尺寸符合Hall-Petch关系。

GH984G alloy cold-rolled seamless tube samples were treated by solid solution at 1 050-1 200 ℃ for 10-90 min, and influence of solid solution on microstructure and hardness of the alloy was studied. The results show that the grains of the cold-rollled alloy were elongated, and second phase particles precipitated on grain boundaries and in grains. After solid solution under different conditions, the alloy had equiaxed crystal structures; the grain size increased and the quantity of the second phase decreased with the increase of temperature and the extension of holding time. The apparent activation energy of grain boundary migration of the alloy increased with the extension of holding time, and the kinetic time index increased first and then decreased with the increase of temperature. The hardness of the alloy decreased with the increase of solid solution temperature and holding time, and had the Hall-Petch relationship with the average grain size.