Role of Rhenium in Single Crystal Ni-Based Superalloys
Role of Rhenium in Single Crystal Ni-Based Superalloys
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DOI：
10.4028/www.scientific.net/msf.638-642.2257
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发表时间：
2010-01
期刊：
影响因子：
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通讯作者：
T. Jin;Wen Wang;Xiao-feng Sun;Z. Hu
中科院分区：
文献类型：
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作者：
T. Jin;Wen Wang;Xiao-feng Sun;Z. Hu
研究了Re对名义成分为Ni-3Cr-12Co-1Mo-6W-6Al-8Ta-0.1Hf-(0，2，4)Re的单晶高温合金组织和性能的影响。随着Re含量的增加，铸态颗粒尺寸变小。Re的加入提高了初始熔化温度，减缓了固溶过程。即使在950℃和1050℃长期时效2000h后，Re含量在4%以上的三种合金中也没有观察到拓扑紧密堆积相析出。稀土延缓了的粗化，有利于提高持久寿命。对变形机制和位错组态进行了研究和讨论。
The effect of rhenium on the microstructure and mechanical properties of single crystal superalloys with a nominal composition of Ni-3Cr-12Co-1Mo-6W-6Al-8Ta-0.1Hf-(0, 2, 4) Re has been studied. With the rise of rhenium content, the size of as-cast particles becomes smaller. Rhenium addition elevates the incipient melting temperature and slows down the solid solution process. Even after 2000h prolonged aging both at 950°C and 1050°C, no topologically close-packed phase precipitation is found in the three alloys with Re content up to 4%. Re retards the coarsening and is beneficial to improving the stress rupture life. The deformation mechanisms together with the dislocation configuration have been studied and discussed.