SUS316鋼単結晶の応力腐食割れに及ぼす引張軸方位の影響

概要

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The stress corrosion cracking (SCC) of SUS 316 steel single crystals in a boiling 42%MgCl_2 solution at 416K was investigated under the constant-loading conditions. Most of the threshold stress to SCC initiation which depended on the tensile axis orientation decreased with increasing Schmid factor in the primary slip system, and cracking susceptibility increased accordingly. The threshold stress corresponded to 60〜80% of the 0.2% yield strength (or critical resolved shear stress) in oil at 416K. In the [001]-oriented specimen, however, the cracking susceptibility was influenced by the primary slip directions : The more parallel they were to the top or side surface, the more the cracking susceptibility increased. Many cracks preferentially nucleated from the micro-pits (and/or corrosion grooves) formed along slip-steps, and grew along the <100> direction on the {210} plane in every type of specimens.
1991-07-15