|Microstructure Evolution of a Cold-rolled 25Cr-7Ni-3Mo-0.2N Duplex Stainless Steel during Two-step Aging Treatments|
|T. Liang; X. Q. Hu; X. H. Kang; D. Z. Li
|Source Publication||Acta Metallurgica Sinica-English Letters
|Abstract||A cold-rolled 25Cr-7Ni-3Mo-0.2N duplex stainless steel (DSS) has been aged in two steps. Firstly, the aging treatment at interval of 50 degrees C in a temperature range from 900 to 1050 degrees C was carried out in order to obtain fine grains. Secondly, another aging treatment at 850 degrees C was performed to reveal the sigma-phase precipitation behavior. A detailed microstructure evolution during those two aging steps was observed by the optical microscope (OM), the scanning electron microscope (SEM), the electron backscatter diffraction (EBSD) and the transmission electron microscope (TEM). The results revealed that the micro-duplex structure with grain size of lower than 10 mu m appeared after the first aging step. However, their grain size was rapidly increased with increasing aging temperature. Meanwhile, the delta -> gamma and/or delta -> gamma + sigma transformations took place in association with the occurrence of the extensive recovery or a little recrystallization in delta-grains. During the second aging treatment, sigma-phase mainly nucleated at delta/gamma interfaces and further grew along those interfaces into various morphologies (e.g., butterfly and granule). A novel precipitation behavior was found in this study that the gamma-grain boundaries bulged not only into the delta-grains as usual, but abnormally into the sigma-phase precipitates without the prior precipitation of the isolated secondary austenite gamma(2) or another phases.|
; hu, xiaoqiang
; kang, xiuhong
; li, dianzhong] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.
; hu, xq (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china.
|Keyword||Duplex Stainless Steel
T. Liang,X. Q. Hu,X. H. Kang,et al. Microstructure Evolution of a Cold-rolled 25Cr-7Ni-3Mo-0.2N Duplex Stainless Steel during Two-step Aging Treatments[J]. Acta Metallurgica Sinica-English Letters,2013,26(5):517-522.
T. Liang,X. Q. Hu,X. H. Kang,&D. Z. Li.(2013).Microstructure Evolution of a Cold-rolled 25Cr-7Ni-3Mo-0.2N Duplex Stainless Steel during Two-step Aging Treatments.Acta Metallurgica Sinica-English Letters,26(5),517-522.
T. Liang,et al."Microstructure Evolution of a Cold-rolled 25Cr-7Ni-3Mo-0.2N Duplex Stainless Steel during Two-step Aging Treatments".Acta Metallurgica Sinica-English Letters 26.5(2013):517-522.
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