錸對定向柱晶高溫合金微觀組織的影響
發(fā)布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新時間：2016-03-21
采用 SEM、EPMA 和 TEM 等手段對不含 Re(0Re)和含 2%Re(2Re)的定向柱晶高溫合金鑄態(tài)和熱處理態(tài)組織進行了系統(tǒng)的研究.
錸對定向柱晶高溫合金微觀組織的影響INFLUENCE OF Re ON THE MICROSTRUCTURES OF A?DIRECTIONALLY SOLIDIFIED Ni-BASED SUPERALLOY采用 SEM、EPMA 和 TEM 等手段對不含 Re(0Re)和含 2%Re(2Re)的定向柱晶高溫合金鑄態(tài)和熱處理態(tài)組織進行了系統(tǒng)的研究. 結果表明: Re 促進了鑄態(tài)共晶外圍和晶界上 μ 相的析出; 合金熱處理后, Re 明顯促進了 MC 碳化物周圍和晶界上相的析出, 0Re 合金 MC 碳化物周圍只有少量的 M6C 相析出, 晶界上有細小的 M23(C, B)6硼碳化物析出, 而 2Re 合金 MC 碳化物周圍和晶界上都有大量塊狀 μ 相析出, μ 相的析出促進了 γ′包層的形成. 0Re 合金中 B 元素明顯偏聚于晶界, 而 2Re 合金中 B 元素分布相對比較均勻. 并對熱處理過程中 μ 相的析出機制進行了深入分析.?
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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