Void Formation and Plastic Deformation Mechanism of a Cold-Rolled Dual-Phase Steel During Tension

doi:10.1007/s40195-019-00967-3

Acta Metallurgica Sinica (English Letters) ›› 2020, Vol. 33 ›› Issue (2): 299-306.DOI: 10.1007/s40195-019-00967-3

收稿日期:2019-07-26 修回日期:2019-08-26 出版日期:2020-02-10 发布日期:2020-03-23

Void Formation and Plastic Deformation Mechanism of a Cold-Rolled Dual-Phase Steel During Tension

Hamid Ashrafi¹(), Morteza Shamanian¹, Rahmatollah Emadi¹, Ehsan Ghassemali²

1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
2. School of Engineering, Jönköping University, Box 1026, 551 11, Jönköping, SwedenAuthors

Received:2019-07-26 Revised:2019-08-26 Online:2020-02-10 Published:2020-03-23
Contact: Ashrafi Hamid

摘要/Abstract

Abstract:

The void formation and plastic deformation micromechanisms of a cold-rolled DP600 steel during tensile loading were studied by scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). The SEM observations revealed that the main void nucleation mechanism in the DP600 steel is decohesion at the ferrite-martensite interfaces. The voids were mostly observed between the closely spaced martensite islands situated at the boundaries of relatively finer ferrite grains. The EBSD results indicated a strain gradient developed from the ferrite-martensite and ferrite-ferrite interfaces into the interior of ferrite grains during the tensile deformation, which led to a stress concentration at these interfaces. Moreover, it was demonstrated that local misorientation inside the finer ferrite grains surrounded by martensite islands was higher than that for the coarser ferrite grains, which made the former more prone to void initiation.

Key words: Dual-phase steel, Void nucleation, Fracture mechanism

. [J]. Acta Metallurgica Sinica (English Letters), 2020, 33(2): 299-306.

Hamid Ashrafi, Morteza Shamanian, Rahmatollah Emadi, Ehsan Ghassemali. Void Formation and Plastic Deformation Mechanism of a Cold-Rolled Dual-Phase Steel During Tension[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(2): 299-306.

图/表 12

Table 1 Chemical composition of DP600 steel used in this study (wt%)

Fig. 1 Geometry and dimensions of the tensile test specimen

Fig. 2 IQ map of the microstructure of DP600 steel

Fig. 3 Engineering stress-strain curve of DP600 steel

Table 2 Tensile properties of DP600 steel

Fig. 4 SEM micrograph of the fracture surface of DP600 steel

Fig. 5 a SEM micrograph of the cross section of fractured specimen. b Variation of logarithmic thickness strain with distance from the fracture surface

Fig. 6 SEM micrograph of the microstructure of the cross section of the tensile-tested specimen at the position of the equivalent logarithmic strain of 0.15, a SE image, b BSE image. Arrows show the location of voids

Fig. 7 SEM micrographs of the microstructures of the cross section of the tensile-tested specimen at the position of the equivalent logarithmic strain of 0.4, a SE image, b BSE image. Arrows show the formation of voids as a result of martensite necking (a), martensite fracturing (b)

Fig. 8 KAM maps of DP600 steel microstructures at equivalent logarithmic strain of a un-deformed sample, b 0.15, c 0.4

Fig. 9 Distribution of KAM values at different strain levels

Fig. 10 GAM maps of DP600 steel microstructures at different equivalent plastic strains: a un-deformed sample, b 0.15, c 0.4

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Void Formation and Plastic Deformation Mechanism of a Cold-Rolled Dual-Phase Steel During Tension

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