A critical assessment of experimental investigation of dynamic recrystallization of metallic materials

Zhang, H.K.; Xiao, H.; Fang, Xuewei; Zhang, Q.; Logé, Roland E.; Huang, Ke

doi:10.1016/j.matdes.2020.108873

Cited by 86 publications

(38 citation statements)

References 111 publications

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“…As can be observed in Figures 6 and 7, the microstructure in the TMAZ transformed progressively from the LAGBs into high HAGBs during hot deformation. This evolution, which was manifested by the formation of finer grains without the nucleation of fine grains at the interfaces, is characteristic of the occurrence of continuous dynamic recrystallization (CDRX) [48,49]. CDRX by lattice rotation near grain boundaries (LRGB), as well as sheared micro-bands (elongated grains induced by shearing force during the friction movements) could be the governing mechanisms responsible for CDRX in this zone.…”

Section: 2grain Size Evolutionmentioning

confidence: 99%

Grain size and misorientation evolution in linear friction welding of additively manufactured IN718 to forged superalloy AD730™

Tabaie

Rézaï-Aria²,

Flipo³

et al. 2021

Materials Characterization

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Selective Laser Melted (SLM) Inconel718 (IN718) superalloy was linear friction welded (LFWed) to forged AD730 TM Nickel-based superalloy. Successful joints free of micro-porosity, micro-cracking, and oxides were obtained. Microstructure variations across the weld line developed during LFW were examined using different techniques, including laser confocal microscopy, scanning electron microscopy, energy dispersive spectroscopy (EDS) and electron backscatter diffraction (EBSD). The microstructure was also evaluated, particularly in terms of Grain size and misorientation changes were determined and correlated with microhardness evolution in different regions of the weld joint. The characteristics of the microstructure on both sides of the weld joint was analyzed and related to the deformation and temperature paths imposed during the LFW process. Dynamic recrystallization (DRX) occurred on both sides of the dissimilar weld line and it was found that Discontinuous DRX (DDRX) and Continuous DRX (CDRX) took place in the WZ and in the TMAZ, respectively. In order to study the influence of the starting microstructure in the LFW experiments, LFW of a homogenized SLM IN718 sample was analyzed and compared with the non-homogenized sample. A clear change in the size and grain misorientation levels of the heat and thermomechanical affected zones were observed between the two conditions. The differences were related to a greater degree of strain induced in homogenized sample and the increasing effect of the solid solution strengthening mechanism caused by a partial dissolution of the second-phase strengthening particles in the matrix.

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Section: 2grain Size Evolutionmentioning

confidence: 99%

Grain size and misorientation evolution in linear friction welding of additively manufactured IN718 to forged superalloy AD730™

Tabaie

Rézaï-Aria²,

Flipo³

et al. 2021

Materials Characterization

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“…Traces of DRX were clearly visible in the EBSD maps as well as in the inverse pole figures (IPF), Figure 11 c,f,i,l. Dislocation-free grain nuclei formed firstly at a favourable boundary, which then led to the formation of necklace-type small recrystallised grains along the original grain boundaries of deformation-induced twins, which is known as a common signature of discrete dynamic recrystallisation [ 78 ] (see also comprehensive reviews by Humphreys et al [ 57 ] and Sakai et al [ 79 ]). Not surprisingly, the fine grains also nucleated at deformation twin boundaries, as is evidenced indirectly by the appearance of a strong high-angle component in the distribution of angles of misorientation, corresponding to that of extension twins in Mg (c.f., Figure 5 c and Figure 10 c).…”

Section: Discussionmentioning

confidence: 99%

Monitoring Dynamic Recrystallisation in Bioresorbable Alloy Mg-1Zn-0.2Ca by Means of an In Situ Acoustic Emission Technique

et al. 2022

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The tensile behaviour of the biocompatible alloy Mg-1Zn-0.2Ca (in wt.%) in the fine-grained state, obtained by severe plastic deformation via multiaxial isothermal forging, has been investigated in a wide range of temperatures (20 ÷ 300) °C and strain rates (5 × 10−4 ÷ 2 × 10−2) s−1 with the measurements of acoustic emission (AE). The dependences of mechanical properties, including the yield stress, ultimate strength, ductility, and the strain-hardening rate, on the test temperature and strain rate, were obtained and discussed. It is shown for the first time that an acoustic emission method is an effective tool for in situ monitoring of the dynamic recrystallisation (DRX) process. The specific behaviour of the acoustic emission spectral density reflected by its median frequency as a function of strain at various temperatures can serve as an indicator of the DRX process’s completeness.

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“…The fine recrystallized grains also indicate that the postdynamic recrystallization (PDRX) could also occur according to previous studies. [30,46,47] The sizes of recrystallized fine grains for interpass times of 1, 5, 20, 50, and 100 s were %10 μm, 8, 9, 10, and 8 μm, respectively. The sizes of deformed large grains were %30, 32, 35, 29, and 25 μm.…”

Section: Static Recrystallizationmentioning

confidence: 98%

“…Hot compression experiments with one and two passes were conducted to study DRX and SRX behaviors, respectively. [19,[28][29][30] The cylindrical compression specimens with a height of 15 mm and diameter of 8 mm were prepared from the designed hot-rolled plate. Figure 1 shows the schematic deformation procedure.…”

Section: Materials and Fabrication Processmentioning

confidence: 99%

Recrystallization Behavior and Microstructure Evolution in High‐Manganese Austenitic Steel

Liu

Xiong

et al. 2021

steel research int.

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Natural gas has attracted increasing attention because it does not cause pollution and is low cost. Natural gas is usually transported or stored in cryogenic-temperature liquefied natural gas (LNG) applications such as pressure vessels and plumbing pipes. The essential requirements for the materials used for these applications are high strength and outstanding low-temperature toughness (Charpy impact toughness at À196 C). The traditional materials used for these applications are Ni-based invar alloys, 9Ni alloys, aluminum alloys, and austenitic steels. [1][2][3][4] Although these conventional cryogenic-temperature materials show excellent mechanical properties, they possess some disadvantages such as high cost, complex manufacturing process, and unstable service behavior. High-manganese austenitic steels have received increasing attention due to their promising potential for LNG applications. [5][6][7] High-manganese steels have high ductility, a combination of strength and toughness, low thermal expansion coefficient, and low cost. The main plastic deformation mechanisms are dislocation slip, mechanical twinning, and strain-induced phase transformation (such as twinning-induced plasticity and transformation-induced plasticity), which depends on stacking fault energy (SFE). [8][9][10][11][12] Scientific understanding of the recrystallization behavior (dynamic recrystallization [DRX] and static recrystallization [SRX]) is a prerequisite for material design and large-scale production in the industry.Recently, many studies have focused on the recrystallization behavior of microalloying high-manganese steels. [9,11,13] The study by Ezatpour et al. [9] on the effect of microalloying elements V and Nb on the DRX behavior of high-manganese steel shows that Nb-bearing steel exhibits high peak stress due to the fine initial grains and NbC precipitates. The dynamic recovery (DRV) is the main deformation mechanism during the work softening process. Gwon et al. [11] reported the hot deformation behavior of V microalloying high-manganese steel. The hot workability of high-manganese steel was decreased due to the addition of V. Finer grains in V microalloying high-manganese steel were obtained from rapid DRX kinetics. Llanos [13] proposed a model to predict the static-recrystallized grain size of high-manganese steel as a function of deformation conditions and alloy elements. The microstructure of high-manganese steel at room temperature is usually austenite. Many researchers have studied the recrystallization behavior of austenitic stainless steel. [14,15] The 304 austenitic stainless steel shows discontinuous dynamic recrystallization (DDRX) and continuous dynamic recrystallization (CDRX) for low and high strain rates, respectively. The strain rate plays an important role in flow stress and the substructure. The studies focusing on the hot deformation behavior or recrystallization behavior of low-alloy steels show that the recrystallization kinetics and model are related to specific materials.

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A critical assessment of experimental investigation of dynamic recrystallization of metallic materials

Cited by 86 publications

References 111 publications

Grain size and misorientation evolution in linear friction welding of additively manufactured IN718 to forged superalloy AD730™

Grain size and misorientation evolution in linear friction welding of additively manufactured IN718 to forged superalloy AD730™

Monitoring Dynamic Recrystallisation in Bioresorbable Alloy Mg-1Zn-0.2Ca by Means of an In Situ Acoustic Emission Technique

Recrystallization Behavior and Microstructure Evolution in High‐Manganese Austenitic Steel

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