Effects of pulsed dual-ion irradiation on phase transformations and microstructure in Ti-modified austenitic alloy
The influence of pulsed 4 MeV Ni ion bombardment, with and without simultaneous helium injection, has been explored in a low swelling, Ti-modified austenitic stainless steel. Irradiations were carried out to 70 dpa at 950/sup 0/K; the pulsing frequencies were either 60 s on/off or 1 s on/off. Compared to continuous irradiation, pulsing caused a decrease in the interstitial loop diameter at 1 dpa, although at higher doses the overall dislocation density was not affected. Pulsing and helium both promoted the stability of MC precipitates and retarded the subsequent G phase formation; in some cases G-phase was suppressed and eta phase formed instead. Small bubble-like cavities were observed to grow into large voids after steady dual beam irradiation to 70 dpa. However, this conversion was suppressed by pulse irradiation to 70 dpa and furthermore the sizes of the small cavities were somewhat reduced. The results are explained in terms of current mechanistic understanding of mean point defect kinetics and the evolution of microstructure and microcomposition during irradiation with superimposed annealing periods.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5628521
- Report Number(s):
- CONF-821049-25; ON: DE84001985
- Resource Relation:
- Conference: TMS/AIME fall meeting(Radiation damage analysis for fusion reactors), St. Louis, MO, USA, 24 Oct 1982; Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
STAINLESS STEELS
PHYSICAL RADIATION EFFECTS
HELIUM
ION BEAMS
MEV RANGE 01-10
MICROSTRUCTURE
NICKEL IONS
POINT DEFECTS
PULSED IRRADIATION
TITANIUM ADDITIONS
ALLOYS
BEAMS
CHARGED PARTICLES
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
ELEMENTS
ENERGY RANGE
FLUIDS
GASES
IONS
IRON ALLOYS
IRON BASE ALLOYS
IRRADIATION
MEV RANGE
NONMETALS
RADIATION EFFECTS
RARE GASES
STEELS
TITANIUM ALLOYS
360106* - Metals & Alloys- Radiation Effects