Effect of Rare Earth Additions on Hydrogen Embrittlement Cracking in 4340 Steel

The effect of a 0.2 weight percent cerium addition on the hydrogen embrittlement cracking resistance of AISI 4340 steel was investigated at yield strength levels of approximately 210 and 185 ksi (1450 and 1280 MPa). Sustained-load delayed failure data for precracked compact tension specimens electro...

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Bibliographische Detailangaben
1. Verfasser:	Sheinker,A A
Format:	Report
Sprache:	eng
Schlagworte:	ADDITIVES ALLOYS CRACK PROPAGATION DIFFUSIVITY FRACTURE(MECHANICS) HYDROGEN HYDROGEN EMBRITTLEMENT Metallurgy and Metallography PERMEABILITY RARE EARTH ELEMENTS STEEL Steel 4340 TENSILE PROPERTIES YIELD STRENGTH
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Zusammenfassung:	The effect of a 0.2 weight percent cerium addition on the hydrogen embrittlement cracking resistance of AISI 4340 steel was investigated at yield strength levels of approximately 210 and 185 ksi (1450 and 1280 MPa). Sustained-load delayed failure data for precracked compact tension specimens electrolytically charged with hydrogen and plated with cadmium exhibited considerable scatter which was attributed to (1) a loss of hydrogen from the specimens during the storage period between cadmium plating and testing and (2) a nonuniform distribution of cerium in the rare earth modified steel.