| Title |
Effect of χ Phase Formation on the Mechanical Properties of 25Cr-7Ni-4Mo-0.2N Super Duplex Stainless Steel |
| Authors |
강창룡(Chang Yong Kang); 김재환(Jae Hwan Kim) |
| DOI |
https://doi.org/10.3365/KJMM.2011.49.3.197 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
super duplex stainless steel; impact toughness; χ phase; σ phase |
| Abstract |
This study was carried out to investigate the precipitation behavior of χ phase and effect of χ-phase which precipitated at the initial stage of aging on mechanical properties of 25%Cr-7%Ni-4%Mo-0.2%N super duplex stainless steel. χ-phase was precipitated mainly at the interface of ferrite/austenite phases and inside of the ferrite phase at the initial stage of aging, and it was transformed into σ-phase with an increase of aging time. The ferrite phase was decomposed into new austenite(γ2)phase and σ-phase by aging treatment. The hardness and tensile strength of the initial stage of aging when χ-phase was precipitated did not changed considerably, while elongation rapidly decreased. Accordingly, it is considered that χ-phase didn`t affect the hardness and strength significantly, but it affected the elongation. |