| Title |
Evaluations of Microstructure and Electrochemical Anodic Polarization of AISI 304L and AISI 316L Stainless Steel Weld Metals with Cr(eq)/Ni(eq) Ratio |
| Authors |
김연희(Yeon Hee Kim); 장아영(Ah Young Jang); 강동훈(Dong Hoon Kang); 고대은(Dae Eun Ko); 신용택(Yong Taek Shin); 이해우(Hae Woo Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2010.48.12.1090 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
metals; welding; corrosion; optical microscopy; ductility dip cracking |
| 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. |