Advanced   Register
IMR OpenIR  > 中国科学院金属研究所  > 期刊论文

题名: Effect of Ta on microstructural evolution and mechanical properties of a solid-solution strengthening cast Ni-based alloy during long-term thermal exposure at 700 degrees C
作者: Gao, Shuang;  Hou, Jieshan;  Yang, Fei;  Guo, Yongan;  Zhou, Lanzhang
发表日期: 2017-12-30
摘要: Effect of Ta on microstructural evolution and mechanical properties of a solid-solution strengthening cast Ni-based superalloy, IN617B alloy, considered as a potential candidate for castings in 700 degrees C advanced ultra-supercritical (A-USC) coal-fired power plants, has been studied in this paper. Detailed observation reveals the alloys with different contents of Ta have similar solution treated microstructure. During long-term thermal exposure at 700 degrees C, Ta addition refines gamma' particles and enhances the thermal stability of gamma' phase by decreasing the gamma-gamma' lattice misfit. With increasing Ta content the solubility of Mo in matrix decreases, which promotes the transformation of film-like M23C6 at grain boundaries (GBs) into blocky M6C carbide with the reaction of M23C6 -> Mo--Cr(+Mo,Ta) M6C. Consequently, the morphology of GB carbide changes from continuous film structure to dispersed block structure. In addition, local concentration of metal elements leads to the precipitation of trace amount of s phase which is not affected by Ta concentration. Nearly all the tensile properties at 700 degrees C of the alloy after long-term thermal exposure are improved noticeably with the increase of Ta content. But, the plasticity of the alloy with 2.0 wt. % Ta addition decreases remarkably due to the excessive Ta content leading to severe M6C coarsening at GBs. The alloy achieves optimal mechanical properties with about 1.0 wt. % Ta content. (C) 2017 Elsevier B.V. All rights reserved.
Appears in Collections:中国科学院金属研究所_期刊论文

Files in This Item:

There are no files associated with this item.

Recommended Citation:
Gao, Shuang,Hou, Jieshan,Yang, Fei,et al. Effect Of Ta On Microstructural Evolution And Mechanical Properties Of A Solid-solution Strengthening Cast Ni-based Alloy During Long-term Thermal Exposure At 700 Degrees C[J]. Elsevier Science Sa,2017,729:903-913.

SCI Citaion Data:
 Recommend this item
 Sava as my favorate item
 Show this item's statistics
 Export Endnote File
Google Scholar
 Similar articles in Google Scholar
 [Gao, Shuang]'s Articles
 [Hou, Jieshan]'s Articles
 [Yang, Fei]'s Articles
CSDL cross search
 Similar articles in CSDL Cross Search
 [Gao, Shuang]‘s Articles
 [Hou, Jieshan]‘s Articles
 [Yang, Fei]‘s Articles
Scirus search
 Similar articles in Scirus
Related Copyright Policies
Social Bookmarking
  Add to CiteULike  Add to Connotea  Add to  Add to Digg  Add to Reddit 
所有评论 (0)
内 容:
Email:  *
验证码:   刷新
标 题:
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.



Valid XHTML 1.0!
Copyright © 2007-2018  中国科学院金属研究所  -Feedback
Powered by CSpace