新型Ni-Co基高温合金中平衡析出相的热力学研究
收稿日期: 2009-07-27
修回日期: 2009-11-20
网络出版日期: 2010-03-11
基金资助
上海市科委基础研究重大项目08dj1400402和上海市教委创新项目09ZZ16资助
THERMODYNAMIC STUDY ON EQUILIBRIUM PRECIPITATION PHASES IN A NOVEL Ni-Co BASE SUPERALLOY
Received date: 2009-07-27
Revised date: 2009-11-20
Online published: 2010-03-11
Supported by
Supported by Major Program for the Fundamental Research of Science and Technology Committee of the Shanghai Municipality (No.08dj1400402) and Innovation Program of Shanghai Municipal Education Committee (No.09ZZ16)
利用热力学计算软件JMatPro和相应的镍基高温合金数据库, 研究了U720Li合金以及在此基础上研发的新型Ni-Co基高温合金的化学成分对平衡相的析出行为、加工性能和γ/γ'晶格错配度的影响. 结果表明: Ti/Al值(原子比)的增加提高了合金中γ/γ'相的晶格错配度, γ'析出相的含量随Ti+Al含量(原子分数)的增加而增加. 因此, 增加Ti/Al值和Ti+Al含量能提高合金的高温强度. Co含量的升高可以拓宽合金的加工窗口, 改善合金的加工能力, 并且还可以增加合金γ/γ'相的晶格错配度, 提高合金错配强化的效果. 同时, Ti/Al值的增加促进合金中η相析出, 而Co含量的增加具有抑制η相的效果. 因此, 在 Co含量较高的Ni-Co基高温合金中, 适当提高Ti含量, 增加Ti/Al值对提高合金高温强度有利.
关键词： Ni-Co基高温合金; 热力学计算; 析出相; 错配度
王衣 , 孙锋 , 董显平 , 张澜庭 , 单爱党 . 新型Ni-Co基高温合金中平衡析出相的热力学研究[J]. 金属学报, 2010 , 46(3) : 334 -339 . DOI: 10.3724/SP.J.1037.2009.00515
Thermodynamic properties of the traditional U720Li alloy and the new Ni-Co base superalloy have been studied using JMatPro and the latest relevant database for Ni base superalloys. The effects of chemical composition on the equilibrium precipitation phases, process-ability and γ/γ' mismatch have been analyzed. It is found that the γ/γ' mismatch increases with the increase of Ti/Al (atomic ratio). The volume fraction of γ' is proportional to the Ti+Al contents (atomic fraction). Therefore, by increasing the Ti/Al ratio and Ti+Al content, the yield strength of alloys can be improved. On the other hand, the γ' solvus temperature decreases by Co additions. As a result, the range of processing temperature is extended. The γ/γ' mismatch also increases with Co additions, which adds additional strengthening to the alloy. Moreover, high Ti/Al ratio or low Co content promotes the precipitation of η phase. Thus, Ni-Co base superalloys with high Ti+Al content, Ti/Al ratio and Co content bear an improved strength, phase stabilities and process-ability.
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