STRAIN-RATE SENSITIVITY OF PLASTIC PROPERTIES OF ALPHA-IRON AT HIGH TEMPERATURES

被引:7
作者
EVANS, RW
SIMPSON, LA
机构
[1] Department of Metallurgy, University College of Swansea
[2] Reactor Core Technology Branch, Whiteshell Nuclear Research Establishment, Manitoba
来源
PHILOSOPHICAL MAGAZINE | 1969年 / 19卷 / 160期
关键词
D O I
10.1080/14786436908216335
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The tensile stress-strain behaviour of high purity iron has been examined over a range of temperatures from 0° to 900°C and strain rates from 0·04 min−1 to 40 min−1. The changes in flow stress which occur during instantaneous changes in strain rate have been measured and calculations of the activation volume for the thermally activated part of the flow stress have been made. The activation volume is found to be independent of strain for a given set of testing conditions and equal to the activation volume calculated from the strain-rate variation of the yield stress. The activation volume ranges from 10−21 cm3 to 9 × 10−21 cm3, increasing with increasing temperature and decreasing strain rate but it is not a unique function of the effective stress in the deforming material. The results can be best explained if the thermally activated part of the flow stress is controlled by the non-conservative motion of jogs in screw dislocations. © 1969 Taylor & Francis Group, LLC.
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页码:809 / &
相关论文
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