Effects of pulsed dual-ion irradiation on phase transformations and microstructure in Ti-modified austenitic alloy

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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 ... continued below

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Pages: 28

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Lee, E.H.; Packan, N.H. & Mansur, L.K. January 5, 1983.

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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.

Physical Description

Pages: 28

Notes

NTIS, PC A03/MF A01; 1.

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  • TMS/AIME fall meeting(Radiation damage analysis for fusion reactors), St. Louis, MO, USA, 24 Oct 1982

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  • Other: DE84001985
  • Report No.: CONF-821049-25
  • Grant Number: W-7405-ENG-26
  • Office of Scientific & Technical Information Report Number: 5628521
  • Archival Resource Key: ark:/67531/metadc1093654

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  • January 5, 1983

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  • Feb. 10, 2018, 10:06 p.m.

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  • Feb. 26, 2018, 12:45 p.m.

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Lee, E.H.; Packan, N.H. & Mansur, L.K. Effects of pulsed dual-ion irradiation on phase transformations and microstructure in Ti-modified austenitic alloy, article, January 5, 1983; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1093654/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.