Effect of Hydrogen Induced Additional Stress on the Influence on High-Strength Steels

Abstract:

The flowing stress of a highstrength steel before unloading is different with the yield stress of the same sample extended in air after unloading and charging with hydrogen. The difference is the hydrogeninduced additive stress, which can help the external stress to enhance the plastic deformation. The hydrogeninduced additive stress, σ_ad, induced through being immered in a 3.5% NaCl solution with pH=4 increases linearly with the yield strength of the sample, e.g., σ_ad=106.6 + 0.14σ_ys. On the other hand, hydrogeninduced additive stress increases linearly with the logarithm of hydrogen concentration in the samples with the yield strengths of 900 and 1050 MPa, i.e, σ_ad=55.5 + 63.6 lnC₀ (σ_ys=900 MPa) and σ_ad=23.5 + 64.2 lnC₀ (σ_ys=1050 MPa). To sum up, the hydrogeninduced additive stress is σ_ad=260 + 0.226σ_ys + 63.9 lnC_0.

• Periodical: Advanced Materials Research (Volumes 887-888)
• Pages: 214-218
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.887-888.214
• Online since: February 2014
• Authors: Hui Lu Li*, Kang Chen Shao, Qing Hao Yang, Jia Ning Feng
• Keywords: High Strength Steel (HSS), Hydrogen Concentration, Hydrogen-Induced Additive Stress

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