金属学报  2010, Vol. 46 Issue (12): 1543-1548    DOI: 10.3724/SP.J.1037.2010.00305

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定向凝固DZ125合金的溶质分配系数及偏析行为的研究

闵志先,沈军,冯周荣,王灵水,刘林,傅恒志

西北工业大学凝固技术国家重点实验室, 西安 710072MIN

STUDY ON PARTITION RATIO AND SEGREGATION BEHAVIOR OF DZ125 ALLOY DURING DIRECTIONAL SOLIDIFICATION

Zhixian, SHEN Jun, FENG Zhourong, WANG Lingshui, LIU Lin, FU Hengzhi

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

闵志先 沈军 冯周荣 王灵水 刘林 傅恒志. 定向凝固DZ125合金的溶质分配系数及偏析行为的研究[J]. 金属学报, 2010, 46(12): 1543-1548.
, , , , , . STUDY ON PARTITION RATIO AND SEGREGATION BEHAVIOR OF DZ125 ALLOY DURING DIRECTIONAL SOLIDIFICATION[J]. Acta Metall Sin, 2010, 46(12): 1543-1548.

摘要 参考文献 相关文章 Metrics 全文: PDF(1231 KB)   摘要: 采用定向凝固技术结合液淬法对DZ125合金平界面和枝晶生长条件下溶质的偏析行为进行了研究, 通过EPMA定量测定γ基体中各元素的溶质含量和淬火平界面两侧固相和液相中的溶质含量, 分别获得了溶质再分配后固相中的溶质分布状态及溶质分配系数. 结果表明, 平界面生长条件下,液相中的熔体流动使溶质再分布始终处于非稳态. Al, Ti, Ta, Mo和Ni元素的溶质分配系数小于1; 而W, Cr和Co元素的溶质分配系数大于1, 溶质分布状态满足Scheil模型. 枝晶与平界面生长的溶质偏析行为基本一致, 然而,固相反扩散显著降低了枝晶生长过程中的溶质偏析. 关键词 ： 镍基高温合金,  溶质分配系数,  偏析,  定向凝固     Abstract：Segregation behavior is an important problem in solidification process of alloys, which determines their growth morphologies, phase distributions and concentration segregations so that it affects the mechanical properties of alloys, such as fatigue lives, creep properies, etc.. However, the segregation behaviors of Ni–based superalloys are very complex that contain multi–components and consist of multi–phases. The solute partition coefficient is a key characteristic parameter to express the solute segregation level and tendency in a solidification process. In the present paper, the solute profiles in directionally solidified DZ125 alloy with planar interface growth, which was obtained through experiments of quenching during directional solidification, have been measured by electron probe micro analysis (EPMA). The steady state of solute redistribution hardly reaches due to melt flow during solidification process. The contents of γ′ phase forming elements, Al, Ti, Ta, Mo and Ni, along longitudinal direction increase with the increase of solidified fraction, while those of W, Cr and Co decrease. The results show that the solute prtition coefficients of Al, Ti, Ta, Mo and Ni are less than unit, those of W, Cr and Co are more than unit. In addition, the solute distribution in solid phase with dendrite growth is similar to that with planar interface growth. Compared the experimental rsults of microsegregation with the calculated ones of Scheil model and Brody–Flemings model, the Brody–Flmings model fits better with the experimental results. It indicates that the back–diffusion in solid phase would reduce the microsegregation during dendrite growth. Key words： Ni-based superalloy    solute partition coefficient    segregation    directional solidification 收稿日期: 2010-06-28      ZTFLH:  TG142   基金资助: 国家自然科学基金项目50827102, 国家重点基础研究发展计划项目2010CB631202和凝固技术国家重点实验室自主课题项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 王灵水 冯周荣 刘林 傅恒志 44.8K 链接本文: https://www.ams.org.cn/CN/10.3724/SP.J.1037.2010.00305      或      https://www.ams.org.cn/CN/Y2010/V46/I12/1543 [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] Kurz W. Fisher D J Fundamental of solidification Switzerland: Trans Tech Publications LTD, 1998:117 [3] Liu L, Huang T W, Zhang J, Fu H Z, Mater Lett 2007; 61:227 [4] Sellamuthu R, Giamei A F. Metal Mater Trans A, 1986; 16A: 419 [5] Tewari S N, Vijayakumar M, Lee J E, Curreri P A. 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