Paper Title:
The Relaxation Behavior of High Chromium- Ni Base Superalloys
  Abstract

The relaxation behavior of wrought high chromium Ni-base alloys Nimonic 80A, Nimonic 101 and Nimonic 105 was studied at different temperatures. All of these alloys exhibited increase in the residual stress during the relaxation tests e.g. at 450°C for Nimonic 80A and 650°C for Nimonic 105. The observed increase in the residual stress is a manifestation of the known phenomenon of “negative creep”. The stress free aging of specimens of these alloys exhibited dimensional contraction at different temperatures ranging from 450°C to 650°C. The abnormal relaxation behavior of these alloys and the observed contraction were attributed to the precipitation and ordering of the intermetallic phase Ni2(Cr,Mo) at the test temperature. The differential thermal analysis i.e. DTA results, demonstrated endothermic peaks to correspond with the order–disorder reaction of Ni2(Cr,Mo).

  Info
Periodical
Edited by
M. Heilmaier
Pages
321-326
DOI
10.4028/www.scientific.net/AMR.278.321
Citation
M. Nazmy, C. Gerdes, "The Relaxation Behavior of High Chromium- Ni Base Superalloys", Advanced Materials Research, Vol. 278, pp. 321-326, 2011
Online since
July 2011
Export
Share

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

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

Authors: Masahiko Ikeda, S. Komatsu, Yuichiro Nakamura, Y. Kobayashi
Abstract:Using Ti-40mass%Ta-0, -4, -8 and -12mass%Sn alloys, the effect of Sn addition on phase constitution in the solution treated and quenched...
1273
Authors: Jeong Min Kim, Bong Koo Park, Joong Hwan Jun, Ki Tae Kim, Woon Jae Jung
Abstract:Small amounts of minor alloying elements such as RE and Sr were added to Mg- 8wt%Al-5wt%Zn (AZ91D+4%Zn), and their effects on the...
374
Authors: Shang Ming He, Xiao Qin Zeng, Li Ming Peng, Xin Wu Guo, Jian Wei Chang, Wen Jiang Ding
Abstract:The microstructure, mechanical properties, creep and corrosion resistance of Mg-Gd-Y-Zr(-Ca) alloys were studied. Small additions of 0.4-0.6...
101
Authors: S.G. Shabestari, M.M. Hejazi, M. Bahramifar
Abstract:The effect of magnesium addition up to 0.9 wt.% on the microstructure and mechanical properties of Al-9Si-0.35Mn alloy has been investigated...
415
Authors: Joon Sik Park, Jeong Min Kim, Young Ho Song, Byung Hwan-Hong, Ye Won Cho, Sang Wook Joo, Joong Seok-Oh
Chapter 6: New Materials and Composites Materials
Abstract:The nature of high specific strength compared with other structural materials has led to wide application of Mg alloys. However, Mg alloys...
727