EBSD Characterization of Microstructure and Micro-texture in a Friction Stir-Welded DP600 Steel

doi:10.1007/s40195-023-01521-y

Abstract

Abstract:

The microstructure and micro-texture in different areas of a friction stir (FS)-welded DP600 steel were investigated by means of electron backscatter diffraction. The volume fraction of martensite and non-polygonal ferrite was evaluated based on the image quality (IQ) parameter. Analysis of grain boundaries revealed that the fraction of sub-grain boundaries as well as that of low-angle grain boundaries in the heat-affected zone (HAZ) and stir zone (SZ) was more than doubled compared to those in the DP600 steel base metal (BM). The micro-texture examination of the BM showed strong {112} < 110 > and {111} < 112 > components with an intensity 4.6 times of that random texture. The texture showed a memory effect in the HAZ, with a reduced overall intensity. Within the SZ, D₁, D₂ and E shear texture components together with a cube component were developed. Formation of these texture components of ferrite were attributed to the transformation of B and R texture components of prior austenite, which are evidences of continuous dynamic recrystallization mechanism in the SZ of the friction stir-welded DP600 steel.

Key words: Dual phase steel, Friction stir welding, Micro-texture, Image quality

H. Ashrafi, M. Shamanian, M. Sanayei, F. Farhadi, J.A. Szpunar. EBSD Characterization of Microstructure and Micro-texture in a Friction Stir-Welded DP600 Steel[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(5): 789-802.

Figures/Tables 13

Fig. 1 Schematic representation of the local shear coordinate system at different locations of the SZ

Fig. 2 Thermal cycle of the SZ recorded during the FSW

Fig. 3 Macroscopic image of the weld cross section

Fig. 4 OM images of the microstructure of weldment: a BM, b outer HAZ comprising of SCHAZ, and FGHAZ, c CGHAZ, d SZ

Fig. 5 Representative IQ maps of different areas across the weldment: a BM, b FGHAZ, c CGHAZ, d SZ

Fig. 6 IQ distribution curves at different areas of weldment: a BM, b FGHAZ, c CGHAZ, d SZ. M: martensite, PF: polygonal ferrite, NPF: non-polygonal ferrite

Fig. 7 Grain boundary map of different areas across the weldment: a BM, b FGHAZ, c CGHAZ, d SZ. Green: 2-5°, blue: 5-15°, red: 15-62°

Fig. 8 Number fraction of SGBs and LAGBs in each zone of the joint

Fig. 9 IPF maps of different locations in the weld cross section: a BM, b FGHAZ, c CGHAZ, d SZ

Fig. 10 φ2 = 0 and φ2 = 45 sections of the ODF map of a bcc metals showing important fibers, b BM, c FGHAZ, d CGHAZ

Fig. 11 Orientation density along different fibers a α-fiber, b γ-fiber, c ε-fiber, d θ-fiber

Fig. 12 a φ2 = 0° and φ2 = 45° sections of the ODF map in the SZ, with b ideal shear texture components of bcc metals

Fig. 13 ODF sections of ideally transformed austenite shear texture components to ferrite a transformed B, b transformed -B, c transformed R [49]

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