標題: | PHASE-TRANSFORMATIONS IN AN FE-7.8AL-29.5MN-1.5SI-1.05C ALLOY |
作者: | CHAO, CY LIU, TF 機械工程學系 材料科學與工程學系 Department of Mechanical Engineering Department of Materials Science and Engineering |
公開日期: | 1-Sep-1993 |
摘要: | Phase transformations in an Fe-7.8Al-29.5Mn-1.5Si-1.05C alloy have been investigated by means of optical microscopy and transmission electron microscopy. In the as-quenched condition, a high density of fine (Fe,Mn)3AlC carbides could be observed within the austenite matrix. When the as-quenched alloy was aged at temperatures ranging from 550-degrees-C to 825-degrees-C, a gamma --> coarse (Fe,Mn)3AlC carbide + DO3 reaction occurred by a cellular precipitation on the gamma/gamma grain boundaries and twin boundaries. Both of the observations are quite different from those observed by other workers in Fe-Al-Mn-C alloys. In their studies, it was found that the as-quenched microstructure was austenite phase (gamma), and (Fe,Mn)3AlC carbides could only be observed within the austenite matrix in the aged alloys. In addition, a gamma --> alpha (ferrite) + coarse (Fe,Mn)3AlC carbide reaction or a gamma --> alpha + coarse (Fe,Mn)3AlC carbide + beta-Mn reaction was found to occur on the gamma/gamma grain boundary in the aged Fe-Al-Mn-C alloys. |
URI: | http://dx.doi.org/10.1007/BF02666330 http://hdl.handle.net/11536/2875 |
ISSN: | 0360-2133 |
DOI: | 10.1007/BF02666330 |
期刊: | METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE |
Volume: | 24 |
Issue: | 9 |
起始頁: | 1957 |
結束頁: | 1963 |
Appears in Collections: | Articles |