Ultra-fine-Grained Ferrite Prepared from Dynamic Reversal Austenite During Warm Deformation

doi:10.1007/s40195-019-00973-5

Abstract

Abstract:

The ultra-fine-grained ferrite (UFGF) with the size of less than 1 μm is often difficult to be obtained for low-alloyed steel in practical production processing. In this study, considering the rod and wire production process, a new method for preparing the UFGF with submicron scale is proposed by warm deformation of six passes with total strain of 2.6, followed by the cooling process in Gleeble-3500 thermo-mechanical simulator. The results show that the UFGF with an average size of 0.64 μm could be obtained via the phase transformation from austenite grains with an average size of 3.4 μm, which are achieved by the deformation-induced reversal austenization during the high strain rate warm deformation. The main driving force for the reversal transformation is the stress. And the interval between the passes also plays an important role in the reversal austenization.

Key words: Ultra-fine-grained ferrite, Dynamic reversal transformation (DRT), Warm deformation, Deformation-induced reversal transformation, Cooling process

Hong-Bin Li, Ming-Song Chen, Ya-Qiang Tian, Lian-Sheng Chen, Li-Qing Chen. Ultra-fine-Grained Ferrite Prepared from Dynamic Reversal Austenite During Warm Deformation[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(2): 290-298.

Figures/Tables 7

Fig. 1 Test schemes of the experimental steel: multi-pass compression test a, measuring yield stress test b, single compression test c

Table 1 Strain path of multi-pass plane strain test

Fig. 2 Flow stress and austenite grains morphology of the experimental steel: temperature and flow stress curves a, reversed austenite b, flow stress of undercooled austenite at 680 °C c, morphology after the third-pass compression and quenching d

Fig. 3 Variations of flow stress and specimen temperature during deformation at different strain rates: flow stress a, variation of temperature b

Fig. 4 Microstructures of the experimental steel after single-pass deformation at 650 °C and different strain rates: 4.14 s-1a, 14.22 s-1b

Fig. 5 Cooling curve and quenched morphology of the experimental steel: cooling curve a, quenching morphology after the second stage b

Fig. 6 Morphology of UFGF microstructure: SEM morphology a, orientation map b, grains size distribution (black lines represent HAGBs, while the gray lines denote LAGBs) c, misorientation distribution d, UFGF TEM morphology in initial pearlite e, UFGF TEM morphology in initial ferrite f, grain boundaries map g

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