The tensile properties and hydrogen embrittlement of 304 and 316 stainless steels with various amount and size of grain boundary carbides were evaluated using slow strain rate test (SSRT) and thermal desorption analysis (TDA). The samples were thermally charged with hydrogen at a conditions of high-pressure 10 MPa hydrogen gas at 300 Celsius degree for a sufficient time to saturate the hydrogen. SSRT was performed from room temperature to cryogenic temperature, and TDA analysis was performed before and after the SSRT to investigate the effect of test temperature and carbides. When the amount and size of grain boundary carbides increases, both thermally charged hydrogen content in the austenitic stainless steel and hydrogen embrittlement increases. This result indicated that the grain boundary carbides are closely related to hydrogen content and hydrogen embrittlement. It was confirmed that the increase in the amount of hydrogen was originated from the increase of grain boundary carbides by separating into sub-peaks, and the how these carbides play a role in hydrogen embrittlement behavior was invenstigate in detail through observations of electron backscatter diffraction (EBSD) and secondary electron microscopy (SEM) images. As the test temperature decreases, the effect of the temperature became more dominant than hydrogen embrittlement.


Effects of Test Temperature and Grain Boundary Carbides on Tensile Properties and Hydrogen Embrittlement of 304 and 316l Stainless Steels

Division / Sponsors: 
Pressure Vessels & Piping (PVP)


Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2020/volume/83815

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