论文

<001>和<011>取向DD407单晶高温合金枝晶间距和微观偏析

  • 杨初斌 ,
  • 刘林 ,
  • 赵新宝 ,
  • 刘刚 ,
  • 张军 ,
  • 傅恒志
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  • 西北工业大学凝固技术国家重点实验室, 西安 710072
杨初斌, 男, 1982年生, 博士生

收稿日期: 2011-03-18

  修回日期: 2011-04-16

  网络出版日期: 2011-10-11

基金资助

国家自然科学基金项目50931004 和 50827102, 国家重点基础研究发展计划项目2010CB631202和2011CB610406以及凝固技术国家重点实验室研究基金项目09-BZ-2010和57-TZ-2011资助

DENDRITE ARM SPACINGS AND MICROSEGREGATIONS IN <001>  AND <011> ORIENTATED SINGLE CRYSTAL SUPERALLOYS DD407

  • YANG Chu-Bin ,
  • LIU Lin ,
  • DIAO Xin-Bao ,
  • LIU Gang ,
  • ZHANG Jun ,
  • FU Heng-Zhi
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  • State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072

Received date: 2011-03-18

  Revised date: 2011-04-16

  Online published: 2011-10-11

Supported by

Supported by National Natural Science Foundation of China (Nos.50931004 and 50827102), National Basic Research Program of China (Nos.2010CB631202 and 2011CB610406), Research Fund of the State Key Laboratory of Solidification Processing (NWPU) of China (Nos.09–BZ–2010 and 57–TZ–2011)

摘要

采用液态金属冷却(LMC)高温度梯度定向凝固炉制备<001>和<011>取向的DD407单晶高温合金, 研究了晶体取向对枝晶间距和微观偏析的影响. 结果表明, 晶体取向对单晶高温合金的枝晶间距和微观偏析有明显的影响. 枝晶间距随着<001>取向偏差角的增加而增加,但随<011>取向偏差角的增加而减小,且<011>取向的枝晶间距因为侧枝的分枝而明显大于<001>取向. 成分分析表明, 在不同取向的单晶中, Al,Ti和Ta富集于枝晶间, 是正偏析元素, 而W严重富集于枝晶干, 为负偏析元素,当<011>取向平行轴向时元素的偏析程度最轻.

本文引用格式

杨初斌 , 刘林 , 赵新宝 , 刘刚 , 张军 , 傅恒志 . <001>和<011>取向DD407单晶高温合金枝晶间距和微观偏析[J]. 金属学报, 2011 , 47(10) : 1246 -1250 . DOI: 10.3724/SP.J.1037.2011.00142

Abstract

Single crystal superalloys DD407 with <001> and <011> orientations were produced with seeding technique by using the liquid metal cooling Bridgman furnace. The dendrite arm spacings (DAS) and microsegregations in the single crystal superalloys with <001> and <011> orientations were investigated. The results indicated that increasing the deviation angle from <001> orientation or decreasing the deviation angle from <011> would increase the dendrite arm spacing. In addition, DAS of single crystal grown along <011> orientation is obviously greater than that of <001> orientation for side–branching. EMPA results showed that the positive segregation elements Al, Ti and Ta enriched in the interdendritic region, and the negative segregation element W enriched in the dendrite core. The microsegregation in the single crystal with <011> orientation paralleled to the sample axis is the lightest. It is found that not only the DAS but the mechanism of dendrite evolution and arrayed pattern of dendrite affect the degree of microsegregation.

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