金属学报  2011, Vol. 47 Issue (4): 397-402    DOI: 10.3724/SP.J.1037.2011.00015

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高温度梯度定向凝固镍基高温合金DZ125的组织演化

闵志先, 沈军, 熊义龙, 王伟, 杜玉俊, 刘林, 傅恒志

西北工业大学凝固技术国家重点实验室, 西安 710072

MICROSTRUCTURAL EVOLUTION OF DIRECTIONALLY SOLIDIFIED Ni-BASED SUPERALLOY DZ125 UNDER HIGH TEMPERATURE GRADIENT

MIN Zhixian, SHEN Jun, XIONG Yilong, WANG Wei, DU Yujun, LIU Lin, FU Hengzhi

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072

闵志先 沈军 熊义龙 王伟 杜玉俊 刘林 傅恒志. 高温度梯度定向凝固镍基高温合金DZ125的组织演化[J]. 金属学报, 2011, 47(4): 397-402.
, , , , , . MICROSTRUCTURAL EVOLUTION OF DIRECTIONALLY SOLIDIFIED Ni-BASED SUPERALLOY DZ125 UNDER HIGH TEMPERATURE GRADIENT[J]. Acta Metall Sin, 2011, 47(4): 397-402.

摘要 参考文献 相关文章 Metrics 全文: PDF(921 KB)   摘要: 采用液态金属冷却(LMC)定向凝固结合液淬法, 在温度梯度(G)为250 K/cm, 凝固速率(V)为2-400 μm/s的条件下系统研究了镍基高温合金DZ125的固/液界面形态、胞/枝晶间距及MC碳化物形态. 随着V的增大, 界面形态经历了浅胞状→深胞状→粗枝晶→细枝晶的转变. 一次胞晶间距随着V的增大而增大, 当V=5 μm/s时, 固/液界面达到胞-枝转变点, 且一次枝晶间距达到最大值. 当V≧10 μm/s时, 一次枝晶间距和二次枝晶间距随着V的增大而减小. MC碳化物生长形态随着V的增大由胞-枝转变点的八面体依次向骨架状、汉字体状、细小枝晶转变. 分析表明, 一次枝晶间距与Trivedi模型和Ma模型吻合较好, 同时, 低速下(V≦50 μm/s)一次枝晶间距与Hunt-Lu模型吻合得很好, 但高速时发生了明显的偏差. 通过非线性拟合得到一次枝晶间距和二次枝晶间距与V分别满足λ1=314.6V-0.24±0.02和λ2=97.76V-0.33±0.01. MC碳化物在凝固中后期由液相析出, 其形态主要受到固/液界面形态和V的影响. 关键词 ： 镍基高温合金,  定向凝固,  微观组织,  枝晶间距     Abstract：The Ni-based superalloy DZ125 was prepared by liquid metal cooling (LMC) directional solidification and quenching technology with withdrawal rate ($V$) range of 2-400 μm/s and temperature gradient up to 250 K/cm. The morphologies of solid/liquid (S/L) interface, cellular/dendritic arm spacings and the morphologies of MC carbide were studied systematically. The shallow cellular interface arised at V=2 μm/s. With increasing the withdrawal rate, the S/L interface turns into deep cellular (V=3 μm/s) and dendritic (V≧5 μm/s) interfaces successively. The cellular spacing is increased with increasing the withdrawal rate. However, the primary dendritic arm spacing is decreased with increasing the withdrawal rate. The maximum value of cellular/dendritic spacings appears at transition from cellular to dendritic interfaces (V=5 μm/s). Meanwhile, the morphology of MC carbide changes from octahedron to frame-like, Chinese-script and finally to fine dendrite with increasing the withdrawal rate. Compared with the theoretical models of primary dendrite spacing, the results are good in agreement with Trivedi's and Ma's models. Furthermore, they are also in agreement with Hunt-Lu model only at lower withdrawal rates (V≦50 μm/s). The relationships of primary and secondary dendritic arm spacings with withdrawal rates can be described as λ1=314.6V-0.24±0.02  and λ2=97.76V-0.33±0.01, respectively. MC carbide precipitated from the melt during solidification, and its morphology is dependent both on the withdrawal rate and the morphology of S/L interface. Key words： Ni-based superalloy    directional solidification    microstructure    dendritic spacing 收稿日期: 2011-01-10      ZTFLH:  TG113.12   基金资助: 国家自然科学基金项目50827102和凝固技术国家重点实验室自主课题项目28-TP-2009资助 作者简介: 闵志先, 男, 1984年生, 博士生 服务 把本文推荐给朋友 加入引用管理器 E-mail Alert RSS 作者相关文章 闵志先 沈军 熊义龙 杜玉俊 刘林 傅恒志 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2011.00015      或      https://www.ams.org.cn/CN/Y2011/V47/I4/397 [1] Fu H Z. Directional Solidification and Processing of Advanced Materials. Beijing: Science Press, 2008: 162 (傅恒志. 先进材料定向凝固. 北京: 科学出版社, 2008: 162) [2] Pollock T M, Murphy W H. Metall Mater Trans, 1996; 27A: 1081 [3] Giamei A F, Tschinkel J G. Metall Trans, 1974; 7A: 1427 [4] Elliott A J, Tin S, King W T, Huang S C, Gigliotti M F X, Pollock T M. Metall Mater Trans, 2004; 35A: 3221 [5] Elliott A J, Pollock T M. 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