Next Article in Journal
Investigation on a Novel Laser Impact Spot Welding
Next Article in Special Issue
The Unified Creep-Fatigue Equation for Stainless Steel 316
Previous Article in Journal
Effect of Rare-Earth Ce on Macrosegregation in Al-Bi Immiscible Alloys
Previous Article in Special Issue
The Effects of Corrosive Media on Fatigue Performance of Structural Aluminum Alloys
Article Menu

Export Article

Open AccessArticle
Metals 2016, 6(8), 178; doi:10.3390/met6080178

Understanding Low Cycle Fatigue Behavior of Alloy 617 Base Metal and Weldments at 900 °C

1
Department of Mechanical Design Engineering, Pukyong National University, Busan 608-739, Korea
2
Korea Atomic Energy Research Institute (KAERI), Daejeon 305-353, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Filippo Berto
Received: 4 July 2016 / Revised: 25 July 2016 / Accepted: 26 July 2016 / Published: 2 August 2016
(This article belongs to the Special Issue Fatigue Damage)
View Full-Text   |   Download PDF [7821 KB, uploaded 2 August 2016]   |  

Abstract

In order to better understand the high temperature low cycle fatigue behavior of Alloy 617 weldments, this work focuses on the comparative study of the low cycle fatigue behavior of Alloy 617 base metal and weldments, made from automated gas tungsten arc welding with Alloy 617 filler wire. Low cycle fatigue tests were carried out by a series of fully reversed strain-controls (strain ratio, Rε = −1), i.e., 0.6%, 0.9%, 1.2% and 1.5% at a high temperature of 900 °C and a constant strain rate of 10−3/s. At all the testing conditions, the weldment specimens showed lower fatigue lives compared with the base metal due to their microstructural heterogeneities. The effect of very high temperature deformation behavior regarding cyclic stress response varied as a complex function of material property and total strain range. The Alloy 617 base weldments showed some cyclic hardening as a function of total strain range. However, the Alloy 617 base metal showed some cyclic softening induced by solute drag creep during low cycle fatigue. An analysis of the low cycle fatigue data based on a Coffin-Manson relationship was carried out. Fracture surface characterizations were performed on selected fractured specimens using standard metallographic techniques. View Full-Text
Keywords: Alloy 617; very high temperature gas-cooled reactor (VHTR); gas tungsten arc welding (GTAW); weldments; low cycle fatigue (LCF); fatigue life; fracture surface characterization Alloy 617; very high temperature gas-cooled reactor (VHTR); gas tungsten arc welding (GTAW); weldments; low cycle fatigue (LCF); fatigue life; fracture surface characterization
Figures

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

Dewa, R.T.; Kim, S.J.; Kim, W.G.; Kim, E.S. Understanding Low Cycle Fatigue Behavior of Alloy 617 Base Metal and Weldments at 900 °C. Metals 2016, 6, 178.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

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