摘要
采用高温长期时效的方法研究了一种在700℃/375bar蒸气参数条件下作为过热器管材使用的镍基高温合金的组织稳定性,得出合金的组织不稳定性主要体现在γ′的粗化、η相的形成和晶界G相的析出。进而采用Thermo-Calc理论计算和分析,提出了通过调整Al、Ti和Si含量来改善组织稳定性的方法。
This paper investigates high temperature structure stability of a nickel base superalloy which is expected to be employed as boiler superheater tubes at ultra-supercritical steam condition of 375 bar and 700℃. The main structure instabilities during thermal exposures include 7' coarsening, large fraction of η formation and certain amount of G phase existence at grain boundaries. By means of Thermo-Calc and phase analyses, the improvement of structure stability of the alloy can be achieved by the adjustment of Al, Ti and Si contents in the alloy.
出处
《材料导报》
EI
CAS
CSCD
2004年第8期131-133,共3页
Materials Reports
基金
感谢美国Special Metals Corp.提供Inconel 740试料并对本课题的资助
