Cryogenic Mechanical Properties and Hydrogen Embrittlement of SAF2205
Mechanical properties and Internal Hydrogen Embrittlement (IHE) of an α+γ duplex stainless steel have been conducted over the temperature range of 293–77K. The results showed that by lowering of testing temperature, the strength of the alloy increased obviously, but the elongation increased to 153K and decreased at lower temperature, while the area reduction decreased a little; at the same time, the H-induced loss of area reduction and elongation got the highest values at about 223K and decreased to almost zero at 77K. Analyses on microstructure indicated that the formation of martensite could occur during deformation and /or decreasing of temperature, which would result in some increase in strength and the temperature dependence of ductility of the alloy at low temperature. However, the IHE behaviour of the alloy was found being dependant on both the formation of martensite and the diffusive ability of hydrogen.
KeywordsAustenitic Stainless Steel Duplex Stainless Steel Liquid Nitrogen Temperature Tensile Deformation Ferritic Steel
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