Next Article in Journal
In Situ High-Energy X-ray Diffraction during Hot-Forming of a Multiphase TiAl Alloy
Next Article in Special Issue
Hot Ductility Loss in a Fe-Ni-Based Superalloy
Previous Article in Journal
Effect of Cu Content on Atomic Positions of Ti50Ni50xCux Shape Memory Alloys Based on Density Functional Theory Calculations
Previous Article in Special Issue
Cyclic Oxidation of High Mo, Reduced Density Superalloys
Article Menu

Export Article

Open AccessFeature PaperArticle
Metals 2015, 5(4), 2236-2251; doi:10.3390/met5042236

Relationships between Microstructural Parameters and Time-Dependent Mechanical Properties of a New Nickel-Based Superalloy AD730™

1
Aubert & Duval, Site des Ancizes, Research and Development Department, BP1, 63770 Les Ancizes Cedex, France
2
Institut Pprime, UPR CNRS 3346, Physics and Mechanisc of Materials Department, ISAE-ENSMA, 1 Avenue Clément Ader, BP 40109, 86961 Futuroscope-Chasseneuil, France
3
Safran SA, SafranTech—Materials & Process Division, Rue des Jeunes Bois—Châteaufort—CS 80112, 78772 Magny-Les-Hameaux, France
4
Safran Turbomeca, Avenue Joseph Szydlowski, 64511 Bordes, France
These authors contributed equally to this work.
*
Author to whom correspondence should be addressed.
Academic Editor: Johan Moverare
Received: 5 November 2015 / Revised: 20 November 2015 / Accepted: 23 November 2015 / Published: 27 November 2015
(This article belongs to the Special Issue Superalloys)
View Full-Text   |   Download PDF [1773 KB, uploaded 27 November 2015]   |  

Abstract

High temperature creep and dwell-fatigue properties of the new nickel-based superalloy AD730™ have been investigated. Three microstructures have been studied in creep (850 °C and 700 °C) and dwell-fatigue (700 °C stress control with trapezoidal signals, and dwell times ranging from 1 s to 3600 s): a coarse grains microstructure, a fine grains one, and single crystalline samples. The aim of this study is to assess the influence of the grain size on creep and creep-fatigue properties. It is demonstrated that fine and coarse grains microstructures perform similarly in creep at 700 °C, showing that the creep properties at this temperature are controlled by the intragranular precipitation. Moreover, both the coarse grains and the fine grains microstructures show changes in creep deformation mechanisms depending on the applied stress in creep at 700 °C. At higher creep temperatures, the coarse grains microstructure performs better and almost no effect is observed by suppressing grain boundaries. During dwell-fatigue tests at 700 °C, a clear effect of the mechanical cycling has been evidenced on the time to failure on both the coarse and the fine grains microstructures. At high applied stresses, a beneficial effect of the cyclic unloading to the lifetime has been observed whereas at lower applied stresses, mechanical cycling is detrimental compared to the pure creep lifetime due to the development of a fatigue damage. Complex creep-fatigue interactions are hence clearly evidenced and they depend on the pure creep behavior reference. View Full-Text
Keywords: cast and wrought Ni-based superalloy; single crystals; creep; dwell-fatigue properties; high temperatures; creep threshold stress; inter/intra granular properties cast and wrought Ni-based superalloy; single crystals; creep; dwell-fatigue properties; high temperatures; creep threshold stress; inter/intra granular properties
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Thébaud, L.; Villechaise, P.; Cormier, J.; Crozet, C.; Devaux, A.; Béchet, D.; Franchet, J.-M.; Organista, A.; Hamon, F. Relationships between Microstructural Parameters and Time-Dependent Mechanical Properties of a New Nickel-Based Superalloy AD730™. Metals 2015, 5, 2236-2251.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top