Microstructural and Mechanical Properties Evaluation of Weld Zone in Super Duplex Stainless Steel for Seawater Proof

서지정보

· 발행기관 : 한국기계기술학회
· 수록지 정보 : 한국기계기술학회지 / 25권 / 5호
· 저자명 : Jeong-Min Lee, Kang Bo An , Gwang-Ho Lee

영어초록

The microstructure and mechanical properties of the heat-affected zone welded using the GTAW process on SDSS material used in offshore structures were analyzed. The chemical composition of the specimen material was analyzed using XRF. The microstructure of the heat-affected zone where the plate was welded was examined by SEM, and the ferrite volume fraction was assessed using the point count method of ASTM E562. A lot of ferrite was formed in the overheated weldment region, and In the weld cap where the cooling rate was fast, ferrite was not converted back to austenite and the microstructure was not uniform. From the ferrite phase fraction, it was shown that it can be applied to the pitting resistance equivalent numbers through changes in mechanical properties according to welding conditions.

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