In-situ EBSD study of deformation behaviour of 600 MPa grade dual phase steel during uniaxial tensile tests

This paper studied the plastic deformation behaviour of DP600 steel subjected to uniaxial tension, by means of in-situ EBSD technique. It provides experimental evidences and detailed insight into the microstructural aspects of plastic deformation. A phase identification method based on the band slop...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-06, Vol.759, p.624-632
Main Authors: Li, Shengci, Guo, Chengyu, Hao, Leilei, Kang, Yonglin, An, Yuguo
Format: Article
Language:English
Subjects:
Deformation behaviour
Dual phase steel
Dual phase steels
Duplex stainless steels
Ferrite
Grain boundary
Grains
In-situ EBSD
Martensite
Microstructure
Misalignment
Misorientation
Plastic deformation
Slopes
Strain localization
Stress concentration
Tensile tests
Work hardening
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Summary:This paper studied the plastic deformation behaviour of DP600 steel subjected to uniaxial tension, by means of in-situ EBSD technique. It provides experimental evidences and detailed insight into the microstructural aspects of plastic deformation. A phase identification method based on the band slope map of EBSD was adopted to differentiate martensite from ferrite. The results show that the plastic strain localization lies mainly in the ferrite grains, fracture could usually start in ferrite grains close to hard martensite grains. With the increase of strain, average misorientation angle decreased while the fraction of LAGBs increased. Average Taylor factor for the whole microstructure became higher at high strains due to work hardening process, and plastic deformation results in soft regions with zonal distribution parallel to the loading direction. In the undeformed state, the texture orientation (111)[01¯1] and (111)[11¯0] are the major components of the γ-fibre while (223)[11¯0] and (221)[11¯0] are the main components of α-fibre. The intensity of the α-fibre slightly decreased, while the intensity of the γ-fibre increased with increasing strain. Plastic deformation occurred in some grains which were subdivided into different regions due to the activation of different slip systems. The tensile axis orientation of the grain rotated gradually to the line link − , and lattice rotation within one single grain differs from regions to regions.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2019.05.083