Ion implantation effects on fatigue properties of Fe-13Cr-15Ni alloys

Rao, G. R.; Lee, E. H.; Chin, B. A.

doi:10.1016/0257-8972(92)90223-w

Ion implantation effects on fatigue properties of Fe-13Cr-15Ni alloys

Conference · Thu Aug 08 04:00:00 EDT 2002 · Surface and Coatings Technology

DOI:https://doi.org/10.1016/0257-8972(92)90223-w· OSTI ID:5519101

Rao, G. R. ^[1]; Lee, E. H. ^[2]; Chin, B. A. ^[3]

Auburn Univ., AL (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Auburn Univ., AL (United States)

Bend fatigue tests and microhardness measurements were carried out on eight complex Fe-13Cr-15Ni alloys based on the composition Fe-13Cr-15Ni-2Mo-2Mn-0.2Ti-0.8Si-0.06C, implanted simultaneously with 400 keV boron and 550 keV nitrogen ions to a dose of 2.3 × 10¹⁶ ions cm^-2 for each ion. For all eight alloys, the dual implantation improved the surface hardness but reduced the fatigue life. Optical microscopy revealed that the implantation suppressed surface slip band formation and slip band crack initiation. Transmission electron microscopy was used to characterize the near-surface microstructures. It is evident that the suppression of slip band formation promoted grain boundary cracking to relieve stresses developed in the grains, thus leading to a reduced fatigue life. A similar study of four simple alloys based on the ternary Fe-13Cr-15Ni indicated that while dual implantation improved fatigue life, up to 250% in one case, triple implantation with boron, nitrogen and carbon ions reduced fatigue life, again owing to a shift to grain boundary cracking. Improvement in fatigue properties of polycrystalline alloys by multiple ion implantation is thus limited by the presence of grain boundaries.

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

DOE Contract Number:: AC05-84OR21400

OSTI ID:: 5519101

Report Number(s):: CONF-910707--3; ON: DE91015930

Conference Information:: Journal Name: Surface and Coatings Technology Journal Issue: 1-3 Journal Volume: 51

Country of Publication:: United States

Language:: English

References (12)

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Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
BORON
CARBON
CHROMIUM ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DISLOCATIONS
ELECTRON MICROSCOPY
ELEMENTS
FATIGUE
GRAIN BOUNDARIES
HARDNESS
ION IMPLANTATION
IRON ALLOYS
IRON BASE ALLOYS
LINE DEFECTS
MANGANESE ALLOYS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL STEELS
NICKEL-CHROMIUM STEELS
NITROGEN
NONMETALS
OPTICAL MICROSCOPY
SEMIMETALS
SLIP
STEELS
TRANSMISSION ELECTRON MICROSCOPY

Ion implantation effects on fatigue properties of Fe-13Cr-15Ni alloys

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