Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 34, Issue 7, Pages 772-779Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670836.2017.1397941
Keywords
Crystal plasticity analysis; pearlite; ferrite; strain-hardening characteristics; size effect; strain-hardening anisotropy
Funding
- Japan Science and Technology Agency under Collaborative Research Based on Industrial Demand 'Heterogeneous Structure Control: Towards Innovative Development of Metallic Structural Materials'
- MEXT
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Strain hardening of ferrite layers in pearlite microstructures plays a crucial role in the stability of elasto-plastic deformation of pearlite. The effects of layer thickness, crystal orientation relationship and loading direction on the strain-hardening characteristics of the ferrite layers were studied by crystal plasticity analysis. The results show that the strain-hardening rate increases in the ferrite layers with small thickness, whereas at the same thickness, the strain-hardening rate varies depending on the loading direction and crystal orientation relationship. When the Schmid factors and mean-free paths of the activated systems are small and short, the strain-hardening rate tends to be high. The ferrite layer exhibits a remarkably high strain-hardening rate when slip systems are sequentially activated with the increase of deformation.
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