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
Fatigue, Hydrogen Environment Assisted Cracking, X70, Steel