Re对定向凝固Ni基高温合金组织及性能的影响  

Effect of Re on Microstructure and Properties of Directionally Solidified Superalloy

作　　者：张俊[1] 张爱斌[1] 谭永宁[1] 贾新云[1] 

机构地区：[1]北京航空材料研究院先进高温结构材料国防科技重点试验室,北京100095

出　　处：《航空材料学报》2010年第3期24-27,共4页Journal of Aeronautical Materials

摘　　要：采用真空感应熔炼和定向凝固重熔技术制备了不同Re含量的Ni基高温合金试样,分析了合金微观组织,测试了热处理后其室温拉伸和高温持久性能。结果表明:Re主要分布于γ基体中,在γ′强化相中分布很少。随着Re含量的增加,γ+γ′共晶体积分数略有增多,枝晶杆γ′细化明显。热处理后γ′立方化程度增加,共晶相含量明显减少。Re的加入显著提高了合金的室温拉伸屈服强度和高温持久寿命,但室温和高温塑性有所降低。Re主要通过固溶在γ基体中来阻碍γ′粗化,增大错配度,从而提高合金综合性能。The effect of different content of Re in alloys on microstructure and the mechanical properties were investigated.The results show that Re distirbutes mainly in γ matrix,the amount of the γ＋γ′ eutectic phases of increases due to Re addition and the size of γ′ phase particles in the dendrite core decreases mankedly.After heat treatment,the shape of γ′ phase particles tends to be more cubic,the amount of the γ＋γ′ eutectic phases decreases obviously.The tensile yield strength at room temperature and stress rupture life at 1100℃/70MPa increase obviously with increment of Re content,while the elongation decreases.

关 键 词：NI基高温合金 组织 力学性能 Re含量 

分 类 号：TG146.15[一般工业技术—材料科学与工程]