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Henager, C.H. Jr.; Simonen, E.P.
Pacific Northwest Lab., Richland, WA (USA)1984
Pacific Northwest Lab., Richland, WA (USA)1984
AbstractAbstract
[en] A modified climb-controlled glide (CCG) creep model, which had been used to successfully rationalize low-dose, light-ion irradiation creep data in pure nickel, accounted for low-fluence irradiation creep rates and loop growth rates in 316 stainless steel. The model also predicted a weak stress dependence and a weak temperature dependence in agreement with typical observations. Both light ion and neutron irradiation creep measurements and microstructural observations at low doses were examined and compared with predictions of the CCG model. Calculated creep rates compared to measured creep rates demonstrated that dislocation glide was the dominant mode of deformation during low dose creep when interstitial loops were small. When the interstitial loop radius approached one-half the average dislocation glide distance, the dislocation glide contribution was small. The stress induced preferred absorption (SIPA) creep mechanism contributed an increasing fraction of the total deformation as the loop radius increased and became dominant at high fluences. The modified CCG creep model assumes that glissile network dislocation intersect the small dislocation loop glide barriers, climb into a favorable orientation and annihilate the loop via a Burgers vector reaction. Dislocation climb controls the rate of loop annihilation that allows dislocation glide between loop barriers. The creep rate is determined by a balance between irradiation enhanced dislocation climb and interstitial loop growth
Primary Subject
Source
Mar 1984; 44 p; 12. international symposium on effects of radiation on materials; Williamsburg, VA (USA); 18-20 Jun 1984; CONF-840604--17; Available from NTIS, PC A03/MF A01 as DE84015578
Record Type
Report
Literature Type
Conference
Report Number
Country of publication
ALLOYS, AUSTENITIC STEELS, CARBON ADDITIONS, CHROMIUM ALLOYS, CHROMIUM-NICKEL STEELS, CORROSION RESISTANT ALLOYS, CRYSTAL DEFECTS, CRYSTAL STRUCTURE, HEAT RESISTING ALLOYS, HIGH ALLOY STEELS, IRON ALLOYS, IRON BASE ALLOYS, LINE DEFECTS, MECHANICAL PROPERTIES, MOLYBDENUM ALLOYS, NICKEL ALLOYS, RADIATION EFFECTS, STAINLESS STEELS, STEELS
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