In Situ Neutron Transmission Bragg Edge Measurements of Strain Fields Near Fatigue Cracks Grown in Air and in Hydrogen

Published: August 15, 2017

Author(s)

Matthew J. Connolly, Peter E. Bradley, Andrew J. Slifka, Elizabeth S. Drexler

Abstract

In situ transmission Bragg edge measurements of the strain field were performed near cracks grown in air and in hydrogen. Through the use of a novel test chamber which is capable of pressurization with hydrogen gas, and amenable to neutron-scattering measurements, fatigue cracks were grown in X70 steel specimens at the NG-6 neutron-imaging beam line at the NIST Center for Neutron Research. The measured strain fields are presented and discussed in the context of proposed mechanisms of hydrogen-assisted fatigue crack growth.
Proceedings Title: Proceeding of the International Hydrogen Conference 2016
Conference Dates: September 26-29, 2016
Conference Location: Jackson Hole, WY
Pub Type: Conferences

Keywords

Fatigue, Hydrogen Environment Assisted Cracking, X70, Steel
Created August 15, 2017, Updated November 10, 2018