| Title |
Effect of Preheating on Weldability and Corrosion Resistance in 690 MPa Grade Quenched and Tempered Steel weld metals |
| Authors |
박민지(Min Ji Park); 이해우(Hae Woo Lee) |
| DOI |
https://doi.org/10.3365/KJMM.2014.52.12.983 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
metals; welding; mechanical properties; electron backscattering diffraction(EBSD); preheating |
| Abstract |
This study is an evaluation on the effects of pre-heating on the weldability and corrosion resistance of 690 MPa grade, quenched and tempered steel. Micro-structural examination on pre-heated specimen confirmed that pre-heating affects coarse grain microstructures in comparison to the none pre-heated specimen. The tensile strength of welded specimen without pre-heating is higher than the tensile strength of welded specimen with pre-heating. The weld of pre-heated specimen, however, exhibits higher impact absorbed energy capability. The weld fracture morphology reveals both quasi-cleavage and ductile fractures. Corrosion test results on both welds showed increasing current density with increasing concentrations of NaCl solution. The pre-heated specimen exhibited higher corrosion current. Image Quality Mapping analysis in EBSD after impact testing determined less deformation on the pre-heated specimen. |