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Microstructure and grain size effects on irradiation hardening of low carbon steel for reactor tanks

Abstract

Irradiation hardening of steel for reactor pressure vessels has been studied extensively during the past few years. A great number of experimental results concerning the behaviour of these steels in the radiation field and several review papers (1,2) have been published. Most of the papers deal with the effects of specific metallurgical factors or irradiation conditions (temperature, flux) on irradiation hardening and embrittlement. In addition, a number of experiments are performed to give evidence on the mechanism of irradiation hardening of these steels. However, this mechanism is still unknown due to the complexity of steel as a system. Among different methods used in radiation damage studies, the changes of mechanical properties have been mainly investigated. By using Hall-Petch's empirical relation, {sigma}{sub y}={sigma}{sub i}+k{sub y} d{sup -1/2} between lower yield stress, {sigma}{sub y}, and grain size, 2d, the information about the effect of irradiation on the parameters {sigma}{sub i} and k{sub y} is obtained. Taking as a base interpretation of {sigma}{sub i} and k{sub y} given by Petch and his co-workers it has been concluded that radiation does not change the stress to start slip but that it increase the friction that opposes the passage of free dislocations across a slip  More>>
Authors:
Milasin, N [1] 
  1. Institute of Nuclear Sciences Boris Kidric, Vinca, Beograd (Serbia and Montenegro)
Publication Date:
May 15, 1964
Product Type:
Miscellaneous
Report Number:
INIS-CS-0225
Resource Relation:
Other Information: 4 tabs, 6 figs, 17 refs, Paper presented on Third United Nations International Conference on the Peaceful Uses of Atomic Energy
Subject:
36 MATERIALS SCIENCE; EMBRITTLEMENT; FERRITIC STEELS; GRAIN SIZE; LOW CARBON-HIGH ALLOY STEELS; MICROSTRUCTURE; RADIATION HARDENING; REACTOR VESSELS
OSTI ID:
20815766
Research Organizations:
Institute of Nuclear Sciences Boris Kidric, Vinca, Laboratorija za reaktorske materijale, Beograd (Serbia and Montenegro)
Country of Origin:
Serbia and Montenegro
Language:
English
Other Identifying Numbers:
TRN: CS06RA645115599
Availability:
Available from INIS in electronic form; Also available from the Institute of Nuclear Sciences, Vinca
Submitting Site:
INIS
Size:
17 pages
Announcement Date:
Dec 29, 2006

Citation Formats

Milasin, N. Microstructure and grain size effects on irradiation hardening of low carbon steel for reactor tanks. Serbia and Montenegro: N. p., 1964. Web.
Milasin, N. Microstructure and grain size effects on irradiation hardening of low carbon steel for reactor tanks. Serbia and Montenegro.
Milasin, N. 1964. "Microstructure and grain size effects on irradiation hardening of low carbon steel for reactor tanks." Serbia and Montenegro.
@misc{etde_20815766,
title = {Microstructure and grain size effects on irradiation hardening of low carbon steel for reactor tanks}
author = {Milasin, N}
abstractNote = {Irradiation hardening of steel for reactor pressure vessels has been studied extensively during the past few years. A great number of experimental results concerning the behaviour of these steels in the radiation field and several review papers (1,2) have been published. Most of the papers deal with the effects of specific metallurgical factors or irradiation conditions (temperature, flux) on irradiation hardening and embrittlement. In addition, a number of experiments are performed to give evidence on the mechanism of irradiation hardening of these steels. However, this mechanism is still unknown due to the complexity of steel as a system. Among different methods used in radiation damage studies, the changes of mechanical properties have been mainly investigated. By using Hall-Petch's empirical relation, {sigma}{sub y}={sigma}{sub i}+k{sub y} d{sup -1/2} between lower yield stress, {sigma}{sub y}, and grain size, 2d, the information about the effect of irradiation on the parameters {sigma}{sub i} and k{sub y} is obtained. Taking as a base interpretation of {sigma}{sub i} and k{sub y} given by Petch and his co-workers it has been concluded that radiation does not change the stress to start slip but that it increase the friction that opposes the passage of free dislocations across a slip plane. In attempting to apply Hall-Petch's relation to one unirradiated ferritic steel with a carbon content higher than 0.15% some difficulties were encountered. The results obtained indicate that the influence of grain size can not be isolated from other factors introduced by the treatments used to produce different grain sizes. This paper deals with a similar problem in the case of irradiated steel. The results obtained give the changes of the mechanical properties of steel in neutron irradiation field as a function of microstructure and grain size. In addition, the mechanical properties of irradiated steel are measured after annealing at 150 deg C and 450 deg C. On the basis of the experimental results obtained the relative microstructure and grain size effects on irradiation hardening of this type of steel have been considered (author)}
place = {Serbia and Montenegro}
year = {1964}
month = {May}
}