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金属学报  1995, Vol. 31 Issue (5): 216-222    
  论文 本期目录 | 过刊浏览 |
Nb,Ti含量对J-90合金凝固偏析的影响
王安川;李依依;李冬法;杨柯;范存淦;师昌绪
中国科学院金属研究所
EFFECT OF Nb AND Ti CONTENTS ON MICRO-SEGREGATION OF J-90 ALLOY
WANG Anchuan; LI Yiyi; LI Dongfa; YANG Ke; FAN Cungan; SHI Changxu(Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110015)
引用本文:

王安川;李依依;李冬法;杨柯;范存淦;师昌绪. Nb,Ti含量对J-90合金凝固偏析的影响[J]. 金属学报, 1995, 31(5): 216-222.
, , , , , . EFFECT OF Nb AND Ti CONTENTS ON MICRO-SEGREGATION OF J-90 ALLOY[J]. Acta Metall Sin, 1995, 31(5): 216-222.

全文: PDF(595 KB)  
摘要: 采用电子探针对不同Nb,Ti含量的J-90合金凝固组织中Nb,Ti的面分布及枝干心部元素的化学成分进行了分析。结果表明:随合金中Nb含量增加,合金中Nb的偏析趋于严重。而Ti的分布则趋于均匀化;合金中Ti量增加时,Nb,Ti的偏析均趋于减轻。定量测试发现,当合金中Nb,Ti含量增加时,Nb,Ti的初凝平衡分配系数均有所增加。通过分析比较还发现,以元素最高含量与最低含量之差作为比较参数,可以合理地反映出合金中元素含量少量调整时元素偏析程度的变化取决于合金中元素的含量和元素分配系数这两个基本因素。同时,实验结果还说明,可以通过降低合金中微量元素含量使凝固时溶质富集层中P等微量元素含量的降低,使得Nb,Ti等易偏析元素的含量相对增加,从而使合金的凝固偏析得以降低。
关键词 NbTiJ-90合金凝固偏析    
Abstract:EMPA has been performed to investigate the distribution of Nb and Ti in the solidification structure of J-90 alloys with different contents of Nb and Ti. With increasing of Nb content in the alloy, Nb tends to be seriously segregated, while distribution of Ti becomes more and more homogeneous, but when the content of Ti in the alloy being increased, segregations of Nb and Ti are all lessened. By increasing contents of Nb and Ti in the alloy, partition coefficients of Nb and Ti at the beginning of solidification are all increased. It was found by comparison that difference between the highest and the lowest content of an element after solidification is a more proper parameter for description of elemental segregation which is dependent on the content of elements and the elemental partition coefficient. The fact that k_(Nb) and k_(Ti) increased with increasing of Nb and Ti contents in the alloys indicated that when contents of trace elements (such as P etc.) were lowered, on the solute-rich layer during solidification there would be less these trace elements while contents of easy-segregated elements, such as Nb and Ti, could increased. As a consequence, k_(Nb) and k_(Ti) would increase and micro-segregation of Nb and Ti would decrease.
Key words Nb    Ti    J-90 alloy    micro-segregation
收稿日期: 1995-05-18     
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