ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In the present study, a new approach is conducted to evaluate dislocation structure inducedby cyclic plasticity. First, cyclic plastic loading tests are carried out up to 100 cycles with threedifferent small strain amplitudes on SUS316L stainless steel at room temperature. The test resultpresents the dependence of the strain amplitude on cyclic hardening and softening behaviors.Specifically, it is found that the cyclic loading test with strain amplitude of 0.25% shows both cyclichardening and cyclic softening, while the cyclic loading tests with strain amplitudes of 0.75% and1.0% show no cyclic softening. Secondly, the dislocation structures of the specimens after cyclicloading are observed by using a transmission electron microscope (TEM), and this observationreveals that the dislocation structure after cyclic loading test depends on the strain amplitude. Finally,a quantitative evaluation method of the dislocation structure is also proposed. The TEM images areconverted into binary images and the resolution dependence of the generated binary image is used tovisualize the characteristics of the dislocation structure. The relationship between strain amplitudes ofcyclic plasticity and dislocation structure organization is clarified by the evaluation method. Finally,the heterogeneity of the dislocation structure is discussed
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.49.pdf
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