Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 27, 2023 - September 29, 2023
Recently, austenitic stainless steels are being applied to hydrogen tanks and piping due to the increasing carbon neutrality of hydrogen. The results of low strain rate tensile tests (SSRT) of austenitic stainless steel in high-pressure hydrogen gas or hydrogen-charged specimens at -120 to 200°C have reported that difference in relative reduction of area and tensile strength were small. Although the crack growth test at room temperature have been reported, the difference between the hydrogen-charged and uncharged specimens were small. However, the crack growth rate of pre-strained and hydrogen-charged specimens increases significantly. This is because austenitic stainless steel transforms into martensite due to plastic deformation, which is susceptible to embrittlement by hydrogen. In this paper, the effect of hydrogen and martensitic transformation was investigated by SSRT on austenitic stainless- steel specimens with hydrogen charging and with varying pre-strained in liquid helium. As a result, the combined effects of pre-strain and hydrogen charging were small.
This test method is proposed as one of the simple strength reliability evaluation test methods for austenitic stainless steel actual members that are used in hydrogen environment for a long period.
