Origin of the Bauschinger effect in a polycrystalline material

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:707

Article

Mamun, A. A.¹  Moat, R. J.¹  Kelleher, Joe²  Bouchard, P. J.¹ 

[1] Open Univ, Engn & Innovat, Milton Keynes MK7 6AA, Bucks, England

[2] Rutherford Appleton Lab, ISIS Facil, Oxford OX11 0QX, England

关键词: Bauschinger effect;    Kinematic hardening;    Neutron diffraction;    Residual strains;    Stainless steel;   

DOI  :  10.1016/j.msea.2017.09.091

来源: Elsevier

【 摘 要 】

There is a long and lively debate in the literature about the origin of the Bauschinger effect in polycrystalline materials, the most widely accepted explanation being the easier movement of dislocations during reverse loading causing the reduction of the yield stress. Other explanations include incompatible deformation at the grain scale and change of dislocation cell structures during forward and reverse loading, but recent publications show these phenomenological explanations of the Bauschinger effect are not holistic. In the experimental work presented here, we have investigated the role of micro residual lattice strain on the origin of the Bauschinger effect in type 316H austenitic stainless steel using in-situ neutron diffraction. Standard cylindrical specimens were tension-compression load cycled at room temperature with the loading interrupted at incrementally larger compressive and tensile strains followed by reloading to the tensile loop peak strain. Mirror symmetric cyclic tests were also performed with tensile and compressive load interruptions followed by compressive reloading to the compressive loop peak strain. A strong correlation is demonstrated between the evolution of residual lattice strain in the grain families and the change in magnitude in macroscopic yield stress, peak stress and the shape of the yielding part of the stress-strain curve for both the cyclic tension yield and compression yield tests. This implies that the residual lattice strain generated by grain scale elastic and plastic deformation anisotropy is the primary source of the Bauschinger kinematic hardening effect observed in type 316H austenitic stainless steel.

【 授权许可】

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