铼对定向柱晶高温合金微观组织的影响
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-03-21
采用 SEM、EPMA 和 TEM 等手段对不含 Re(0Re)和含 2%Re(2Re)的定向柱晶高温合金铸态和热处理态组织进行了系统的研究.
铼对定向柱晶高温合金微观组织的影响INFLUENCE OF Re ON THE MICROSTRUCTURES OF A DIRECTIONALLY SOLIDIFIED Ni-BASED SUPERALLOY采用 SEM、EPMA 和 TEM 等手段对不含 Re(0Re)和含 2%Re(2Re)的定向柱晶高温合金铸态和热处理态组织进行了系统的研究. 结果表明: Re 促进了铸态共晶外围和晶界上 μ 相的析出; 合金热处理后, Re 明显促进了 MC 碳化物周围和晶界上相的析出, 0Re 合金 MC 碳化物周围只有少量的 M6C 相析出, 晶界上有细小的 M23(C, B)6硼碳化物析出, 而 2Re 合金 MC 碳化物周围和晶界上都有大量块状 μ 相析出, μ 相的析出促进了 γ′包层的形成. 0Re 合金中 B 元素明显偏聚于晶界, 而 2Re 合金中 B 元素分布相对比较均匀. 并对热处理过程中 μ 相的析出机制进行了深入分析.
Up to now, considerable effort has been expended in attempts to investigate the influences of Re on Ni-base single crystal superalloys. However, few study had elucidated the influences of rhenium on carbide,
boride and grain boundary. Therefore, the influence of a 2%Re (mass fraction) addition on the as-cast and heat-treated microstructures of a Ni-based directionally solidified superalloy was investigated by comparison with Re-free alloy using SEM, EPMA and TEM. The results show that Re accelerates the precipitation of μ phase in the periphery of eutectic and at grain boundary for as-cast microstructure. After heat treatment, Re also accelerates the precipitation of phase in the vicinity of primary MC carbide and at grain boundary. For 0Re alloy, there are small number of M6C carbide in the vicinity of primary MC carbide and M23(C, B)6 boro-carbide at grain boundary. For 2Re alloy, a large amount of blocky μ phase enveloped by thick γ'-film is found in the vicinity of primary MC carbide and at grain boundary. Enrichment of boron along the grain boundary is observed in 0Re alloy. On the contrary, relatively uniform distribution of B is found in 2Re alloy. The precipitation mechanism of μ phase during the process of heat treatment is also analyzed.
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