Effect of R Phase Formation on the Impact Toughness of a 25%Cr-7%Ni-3%Mo Duplex Stainless Steel
The aging behavior (microstructural evolution and mechanical properties change) of a 25%Cr-7%Ni-3%Mo duplex stainless steel at 873 K was investigated. A very short term (3.6 ks) aging treatment caused a significant decrease of impact toughness before the formation of σ phase. Quasi-stable R phase was observed to form locally in the material aged for 3.6 ks. These results indicate that the significant loss of impact toughness due to the R phase formation at the very early stage of aging occurs before the embrittlement due to the σ phase.
- ISIJ international
ISIJ international 39(2), 191-194, 1999-02-15
The Iron and Steel Institute of Japan