ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00414228
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