Reveal Hydrogen Behavior at Grain Boundaries in Fe-22Mn-0.6C TWIP Steel via In Situ Micropillar Compression Test

doi:10.1007/s40195-021-01370-7

Abstract

Abstract:

In this study, the effect of hydrogen on dislocation and twinning behavior along various grain boundaries in a high-manganese twinning-induced plasticity steel was investigated using an in situ micropillar compression test. The compressive stress in both elastic and plastic regimes was increased with the presence of hydrogen. Further investigation by transmission electron backscatter diffraction and scanning transmission electron microscope demonstrated that hydrogen promoted both dislocation multiplication and twin formation, which resulted in higher stress concentration at twin-twin and twin-grain boundary intersections.

Key words: Hydrogen, TWIP steel, Micropillar compression, Grain boundary, t-EBSD

Xu Lu, Dong Wang, Di Wan, Xiaofei Guo, Roy Johnsen. Reveal Hydrogen Behavior at Grain Boundaries in Fe-22Mn-0.6C TWIP Steel via In Situ Micropillar Compression Test[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(7): 1095-1104.

Figures/Tables 9

Table 1 Chemical composition of the studied TWIP steel

C	Mn	Al	Nb	V	Ti	N	Fe
0.63	22.60	0.008	0.03	0.108	0.03	0.016	Bal.

Table 2 Crystallographic information of the selected GBs ((φ1 Φ φ2) denotes Euler angles, α is the tilt angle between the sample surface and the GB, [U V W] is the misorientation axis, and θ is the misorientation angle between adjacent grains)

GB	Grain A	Grain B	[U V W]	θ	α
GB	(φ1 Φ φ2)		[U V W]	θ	α
LAGB1	(270.2 89.2 179.6)	(86.8 91.3 2.2)	[− 1 - 10 5]	4.2°	90°
LAGB2	(355.7 4.5 301.3)	(291.6 92.5 181.4)	[− 1 17 15]	7.8°	50.1°
HAGB1	(263.7 82.5 176.0)	(134.2 32.4 71.1)	[− 12 17 14]	43.4°	89.2°
HAGB2	(46.0 66.6 340.4)	(318.5 133.9 185.4)	[− 7 - 4 11]	33.5°	87.1°
HAGB3	(316.8 93.2 142.6)	(75.6 72.7 315.3)	[− 8 - 6 5]	52.3°	76.9°

Fig. 1 a Microstructure of the studied TWIP steel showing the selected GB for micropillar fabrication; b the corresponding inverse pole figure (IPF) map; c SEM image of FIB-milled micropillars along the GB marked in a; d higher magnification of the pristine micropillar enclosed by the yellow box in c

Fig. 2 Representative a engineering stress-strain curves; b stress-strain curves in the elastic regime for micropillars at LAGB2 that were tested in both hydrogen-free and hydrogen-charged conditions

Fig. 3 Effect of hydrogen on the ultimate strength (σy) for the tested micropillars

Fig. 4 Micrographs of deformed micropillars at HAGB3 that were tested in a hydrogen-free, b hydrogen-charged conditions

Fig. 5 a, b Lift-out procedures for the selected micropillars; c the milled lamella for t-EBSD and STEM characterization

Fig. 6 Micrographs of the micropillar lamellae containing HAGB3 after compressed in a1 air, b1 hydrogen-charged conditions; and the corresponding t-EBSD results showing a2, b2 IPF, a3, b3 image quality (IQ) maps

Fig. 7 Bright-field STEM images showing dislocations and twins in the deformed micropillars from HAGB3 tested in a hydrogen-free, b hydrogen-charged conditions. The yellow arrows refer to twins, and the red arrows refer to dislocations

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