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Vol.48, No.12, 1090 ~ 1097, 2010
Title
Evaluations of Microstructure and Electrochemical Anodic Polarization of AISI 304L and AISI 316L Stainless Steel Weld Metals with Cr(eq)/Ni(eq) Ratio
김연희 Yeon Hee Kim , 장아영 Ah Young Jang , 강동훈 Dong Hoon Kang , 고대은 Dae Eun Ko , 신용택 Yong Taek Shin , 이해우 Hae Woo Lee
Abstract
This pitting corrosion study of welded joints of austenitic stainless steels (AISI 304L and 316L) has addressed the differentiating solidification mode using three newly introduced filler wires with a flux-cored arc welding process (FCAW). The delta ferrite (δ-ferrite) content in the welded metals increased with an increasing equivalent weight ratio of chromium/nickel (Cr(eq)/Ni(eq)). Ductility dip cracking (DDC) was observed in the welded metal containing ferrite with none of AISI 304L and 0.1% of AISI 316L. The potentiodynamic anodic polarization results revealed that the Cr(eq)/Ni(eq) ratio in a 3.5% NaCl solution didn`t much affect the pitting potential (E(pit)). The AISI 316L welded metals with a-ferrite content of over 10% had a superior E(pit) value. Though the AISI 316L welded metal with 0.1% ferrite had larger molybdenum contents than AISI 304L specimens, it showed a similar Epit value because the concentration of chloride ions and the corrosion product induced severe damage near the DDC.
Key Words
metals, welding, corrosion, optical microscopy, ductility dip cracking
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