热处理对定向凝固Co基合金微观组织的影响
Effect of Heat-treatment on Microstructure of Directional Solidification Co-base Superalloy
孙跃军1, 林陌思1, 葛艳辉2, 张 军3
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作者单位：(1. 辽宁工程技术大学 材料科学与工程学院, 辽宁 阜新 123000; 2. 中平能化集团天工机械制造有限公司, 河南 平顶山, 467000; 3. 中国科学院力学研究所, 北京 100190)
中文关键字：定向凝固Co基合金； 固溶； 时效； 碳化物
英文关键字：directional solidification Co-base superalloy; solid solution; aging; carbide
中文摘要：利用XRD和扫描电镜研究了热处理对一种定向凝固Co基合金微观组织的影响。结果表明：Co基合金的铸态组织主要由Co的固溶体基体、M7C3、MC和M23C6碳化物组成，其中M7C3和MC为块状，主要分布在枝晶间， M23C6 呈颗粒状，分布在块状M7C3和MC周围。合金经1150 ℃× 4h 固溶处理后，大部分块状M7C3和MC溶入Co的固溶体基体中，在随后的空冷中析出颗粒状M23C6。在870 ℃和970 ℃时效时，随时效温度的升高和时效时间的延长，合金中M23C6 的尺寸逐渐增大。
英文摘要：The effects of heat-treatment on the microstructure of directional solidification Co-base superalloy were investigated using XRD and SEM. The results show that the microstructure of Co-base superalloy as-cast is composed of Co matrix, M7C3, MC and M23C6. Among them, MC and M7C3 distributes in inter dentrite and M23C6 near the MC and M7C3. After solid solution heat-treating at 1150 ℃ for 4 h, most MC and M7C3 dissolves into Co-base matrix, M23C6 is deposited from Co matrix during following air cooling. When aging at 870 ℃and 970 ℃, the size of M23C6 increases with the increase of temperature and aging time.