The role of ε-martensite in the impact toughness of an Fe-17Mn alloy
- 88 Downloads
The influence of ε-martensite on the cryogenic toughness of an Fe-17 wt% Mn alloy was studied in this work. Alloys were tempered at various temperatures in order to systematically increase the volume fraction of ε-martensite. This was followed by Charpy impact testing conducted at room temperature and at−196°C. The experimental results indicated that although room-temperature toughness was not influenced by the ε-martensite content, the cryogenic toughness was strongly dependent on the volume fraction of ε-martensite. In particular, with the exception of the alloys tempered at 400 and 450°C, the impact toughness consistently increased with ε-martensite content. Microstructural and fractographic evaluations using SEM and TEM suggested that the toughness improvements were attributed to the ε→ α stress-induced martensite transformation. No microstructural evidence was found which could be ascribed to an effect of ε-martensite on the low-temperature embrittlement exhibited by Fe-Mn alloys tempered at 400–450°C.
KeywordsPolymer Martensite Martensite Transformation Impact Testing Impact Toughness
Unable to display preview. Download preview PDF.
- 3.J. Namekata and Y. Kondo, J. Jpn. Soc. Strength Fract. Mater. 22 (1987) 1.Google Scholar
- 4.Y. N. Petrov, T. F. Volynova, I. A. Yakubstov, I. B. Medov and V. M. Mnasin, Phys. Met. Metall. 68 (1989) 169.Google Scholar
- 12.M. A. Filippov, V. Y. Lugovykh, S. Studenok and M. Y. Poptsov, Phys. Met. Metall. 66 (1988) 156.Google Scholar
- 15.H. Yoshimura, T. Shimizu, H. Yada and K. Kitajima, Trans. ISIJ 20 (1980) 187.Google Scholar
- 19.L. E. Murr and F. Z. Grace, Trans. TMS-AIME 245 (1969) 2225.Google Scholar