Relationship between Hydrogen-induced Additive Stress and Threshold Cracking Stress for a High-strength Steel

LI Hui-lu; YU Zhu-huan; LI Ying; CHU Wu-yang; QIAO Li-jie

Corrosion & Protection > 2009 > 30(10): 678-683.

LI Hui-lu, YU Zhu-huan, LI Ying, CHU Wu-yang, QIAO Li-jie. Relationship between Hydrogen-induced Additive Stress and Threshold Cracking Stress for a High-strength Steel[J]. Corrosion & Protection, 2009, 30(10): 678-683.

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Relationship between Hydrogen-induced Additive Stress and Threshold Cracking Stress for a High-strength Steel

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Received Date: September 24, 2008

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The relationship between hydrogen induced additive stress and threshold cracking stress of high strength steel 40CrMoTi was studied using SSRT.The hydrogen-induced additive stress,σad,increased linearly with the increase of both yield strength and logarithm of hydrogen concentration for the samples,i.e,σad=-260+0.226σys+63.9 lnC0.The threshold stress decreased with the increase of logarithm of hydrogen concentration for the samples,i.e,σHIC=863-145 lnC0(σs=900 MPa),σHIC=891-183 lnC0(σs=1 050 MPa).The relative fracture stress σF(H)/σF during charging with hydrogen decreased with the increase of logarithm of hydrogen concentration for the samples,i.e,σF(H)/σF=0.97-0.18 lnC0(σs=900 MPa),σF(H)/σF=0.95-0.24 lnC0(σs=1 050 MPa).
- high-strength steel,
- hydrogen-induced additive stress,
- hydrogen-induced threshold stress

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