Disbonding between 21/4Cr-1Mo Steel and Overlaid Austenitic Stainless Steel by Means of Electrolytic Hydrogen Charging Technique(Materials, Metallurgy & Weldability)

概要

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Disbonding meaning separation-type cracking which occurs at the transition zone between 21/4Cr-1Mo steel and overlaid austenitic stainless steel is considered to be attributed to hydrogen accumulation at the transition zone, and has been generally studied with autoclave in laboratory scale. The authors studied to apply electrolytic hydrogen charging technique in the viewpoint of the simplicity of experiment. Main conclusions obtained are as follows: 1) Electrolytic hydrogen charging technique under suitable conditions can be utilized for the purpose of comparative test of disbonding susceptibility. 2) Disbonding easily occurred in PWHT materials overlaid with Type 309, 308, 310. No disbonding occurred in material overlaid with Inconel or Type 309 combined with low carbon 21/4Cr-1Mo buttered metal. 3) Microscopic observation showed that the disbonding mainly occurred at the front edge of hardened carbide layer.
大阪大学の論文