Journal of Materials Science

, Volume 29, Issue 16, pp 4399–4403 | Cite as

The role of ε-martensite in the impact toughness of an Fe-17Mn alloy

  • D. Q. Wang
  • H. F. Lopez


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.


Polymer Martensite Martensite Transformation Impact Testing Impact Toughness 
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • D. Q. Wang
    • 1
  • H. F. Lopez
    • 1
  1. 1.Materials Department, College of Engineering and Applied ScienceUniversity of Wisconsin-MilwaukeeMilwaukeeUSA

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