实验研究固溶及稳定化处理工艺对GH738合金碳化物及γ'强化相析出规律的影响.以标准热处理:1020℃×4 h/AC(空冷)+ 845℃×4 h/AC+ 760℃×16 h/AC和1080℃×4 h/AC+845℃×24 h/AC +760℃×16 h/AC为基础,调整稳定化阶段保温时间.研究了该合金稳定化过程中碳化物及γ'强化相析出和回溶规律,绘制了γ'强化相长大曲线.结果表明,1020℃固溶后,稳定化时间的延长使晶界析出碳化物增多且呈现半连续分布;而经1080℃固溶后,碳化物析出沿着晶界呈连续状分布;同时,经两种固溶温度处理后,稳定化时间延长,γ'强化相长大符合Oswald熟化规律;经1020℃标准热处理后,合金具有较好强塑性配合,尤其在塑性指标方面有明显优势;而经1080℃标准热处理后,合金持久性能表现更佳.
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