Session: MF-02-05 Materials for Hydrogen Service (Joint with CS-02 and HT-07) - Specimen Size and Rate Effects

Paper Number: 107475

107475 - Combined Hydrogen Embrittlement and Strain Rate Sensitivity of Annealed and Forged 304L Steel 

In this work, the combined effects of strain rate and internal hydrogen (from gaseous precharging) on the tensile properties of 304L austenitic stainless steel in both annealed and forged conditions are characterized. Due to its high corrosion resistance, strength, and formability, 304L has a wide variety of applications, including pressure vessels, valves, and other line components. While both the strain rate sensitivity and hydrogen effects on 304L have been reported in the past, the combined influence of internal hydrogen and strain rate on the tensile flow curves has not been studied. To better understand these effects, uniaxial tensile tests were performed at strain rates varying between approximately 10^-2 and 10^-5 per second both with and without internal hydrogen. The combined influence of strain rate and internal hydrogen on the tensile flow curves and strain-induced martensite are reported and discussed. It was found that the 0.2% offset yield stress increased with increasing strain rate for both conditions (with and without internal hydrogen).  Additionally, for the annealed material, the relative change in stress was shown to be approximately equivalent (an increase of 60 MPa) when comparing the fastest strain rate (10^-2 /s) with the slowest rate (10^-5 /s). The influence of internal hydrogen on rate dependent parameters are also discussed for the annealed and forged 304L.

 

Sandia National Laboratories is a multimission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC., a wholly owned subsidiary of Honeywell International, Inc., for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-NA-0003525.

Presenting Author: Robert Wheeler Sandia National Laboratories

Presenting Author Biography: Rob Wheeler is a postdoctoral appointee in the Hydrogen Effects on Materials Laboratory at Sandia National Laboratories.

Authors:

Robert W. Wheeler Sandia National Laboratories
Joseph Ronevich Sandia National Laboratories
Chris San Marchi Sandia National Laboratories
James W. Foulk Sandia National Laboratories
Mazen Diab Sandia National Laboratories
Coleman Alleman Sandia National Laboratories