Mechanical and hardness evaluations of Fe-18Cr-18Mn alloys
A series of Fe-18Cr-18Mn-N-C alloys was produced and evaluated to determine their mechanical and hardness properties. In one group, different levels of nitrogen and carbon were added to a base composition of Fe-18Cr-18Mn. The base Fe-18Cr-18Mn alloy had a fcc-bcc duplex microstructure. The addition of nitrogen and carbon stabilised the fcc phase. These alloys had increasing room temperature hardness, strength, and failure energy with increasing interstitial concentrations. At cryogenic and elevated temperatures, these alloys had increasing hardness (and by implication, increased strength) with increasing interstitial concentrations. In a second group, different levels of nitrogen and carbon were added to the base Fe-18Cr-18Mn composition to which minor solid solution additions of silicon, molybdenum, and nickel had been added. Minor alloy additions made only nominal improvement to mechanical and hardness properties. Nitrogen remained interstitial. However, these minor solid solution additions reduced carbon solubility resulting in the formation of M23C6 precipitates that, while increasing alloy hardness and strength, greatly reduced fracture toughness. The present study suggests that replacing nickel with manganese in stainless steels results not only in more economical alloys but also in alloys with higher strength and hardness.
- Research Organization:
- National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR
- Sponsoring Organization:
- USDOE - Office of Fossil Energy (FE)
- OSTI ID:
- 935015
- Report Number(s):
- DOE/NETL-IR-2008-226; NETL-TPR-1805
- Journal Information:
- Materials Science and Technology, Journal Name: Materials Science and Technology Journal Issue: 1 Vol. 24; ISSN 0267-0836
- Publisher:
- Maney Publishing (London, UK and Cambridge, MA) on behalf of Institute of Materials, Minerals and Mining
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ADSORPTION HEAT
ALLOYS
CARBON
CHEMISORPTION
CRYOGENICS
FRACTURE PROPERTIES
HARDNESS
INTERSTITIALS
MANGANESE
MICROSTRUCTURE
MOLYBDENUM
MORPHOLOGY
NICKEL
NITROGEN
Nitrogen
PENTACENE
SILICON
SOLID SOLUTIONS
SOLUBILITY
SORPTIVE PROPERTIES
STAINLESS STEELS
carbon
hardness
manganese
microstructure
stainless steels
tensile