| Title |
Effects of Si on the Characteristics of FCA Multi-Layer Weld Metal with 460 MPa Yield Strength Grade Steels for Ships and Marine Structures |
| Authors |
김종식(Jong-sig Kim); 이명수(Myeong-soo Lee); 정종민(Jong-min Jung); 최한글(Han-geul Choi); 정상훈(Sang-hoon Jeong); 강창룡(Chang-yong Kang) |
| DOI |
https://doi.org/10.3365/KJMM.2018.56.7.499 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
impact toughness; strength; CTOD; microstructure. FCAW; Si |
| Abstract |
This study investigated the effect of Si on the characteristics of FCA multi-layer weld metal with 460 MPa yield strength grade steels for ships and marine structures. The effect on microstructure was evaluated by tensile, charpy impact and CTOD testing of 4 FCAW welds containing various C and Si contents. C content affected weld metal properties depending on Si content, microstructure, strength and impact value. With lower C content, strength and impact value increased when Si content was reduced, because of higher AF volume fraction. With higher C content, those properties were little affected by Si content. These phenomena indicate that C affects phase transformation more than Si. The CTOD value was higher with lower Si and higher C content. This was interpreted to mean that a lower volume fraction of not only PF, FS but also the M-A phase, can affect crack initiation sites, due to higher C and lower Si contents.(Received April 5, 2018; Accepted May 16, 2018) |