Paper Title:
Segregation of Alloying Elements of Directionally Solidified Nickel Based Superalloy CM247LC during Creep Degradation Process
  Abstract

The mechanism of the degradation process of nickel based superalloy CM247LC under creep loading was analyzed by considering the microscopic chemical composition of the material such as phase boundary of γ and γ’ phases. In this study, a Directionally Solidified (DS) nickel-based superalloys CM247LC was used as test specimens. The creep test was performed at 900oC under an uni-axial stress of 216 MPa. Each specimen was creep ruptured and interrupted at different hours and then analyzed. The change of chemical composition around the interface analyzed precisely by used Auger Electron Spectroscopy (AES). It was found that the local enrichment or lack of cobalt and chromium was found at the interface. This tendency was not found in the stress free area. Since chromium is the well-known element that dominates the degradation of this material, such an enrichment or lack of cobalt and chromium may play an important role for forming a crack propagation path near the interface. This local segregation should be analyzed further to make clear degradation mechanism of this material.

  Info
Periodical
Key Engineering Materials (Volumes 353-358)
Edited by
Yu Zhou, Shan-Tung Tu and Xishan Xie
Pages
537-540
DOI
10.4028/www.scientific.net/KEM.353-358.537
Citation
T. Niki, K. Ogawa, T. Shoji, "Segregation of Alloying Elements of Directionally Solidified Nickel Based Superalloy CM247LC during Creep Degradation Process", Key Engineering Materials, Vols. 353-358, pp. 537-540, 2007
Online since
September 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Yo-ichi Takeda, Hiroyuki Yamauchi, Qunjia Peng, Tetsuo Shoji
Abstract:The effects of cold working and heat treatment on caustic stress corrosion cracking (SCC) of mill annealed (MA) alloy 800M in boiling...
986
Authors: Yu Dong Fu, Gang Wang, Chen Liu, Qing Fen Li
Abstract:In the present paper, the non-equilibrium grain-boundary segregation of P atom was studied in low alloy steels subjected to a low tensile...
396
Authors: Alain Portavoce, Guy Tréglia, Boubekeur Lalmi, Christophe Girardeaux, Dominique Mangelinck, Bernard Aufray, Jean Bernardini
Abstract:Silicide sequential phase formation during tens-of-nanometer-thick metallic film reaction on Si substrate has been extensively studied....
633
Authors: Xin Li Song, Ze Xi Yuan, Juan Jia, Ping He Li, Di Wang, Li Xia Fan
Abstract:The cold roll B-added Ti-IF steel is annealed for different times at 810 oC. The microstructure development is studied by Optical...
320
Authors: A. Roustila, A. Rabehi, M. Souici, J. Chene
Chapter 6: Surface Engineering
Abstract:ZrNi intermetallic compound is used in several application fields due to its very favorable characteristics for the storage of hydrogen. The...
709