Continuous dynamic recrystallization behavior and kinetics of Al–Mg–Si alloy modified with CaO-added Mg

2016 ◽  
Vol 673 ◽  
pp. 648-659 ◽  
Author(s):  
Ji-Woon Lee ◽  
Kwang-Tae Son ◽  
Taek-Kyun Jung ◽  
Young-Ok Yoon ◽  
Shae K. Kim ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
Recrystallization Behavior ◽  
Continuous Dynamic Recrystallization ◽  
Dynamic Recrystallization Behavior ◽  
Continuous Dynamic ◽  
Kinetics Of

Dynamic Recrystallization Behavior of Biomedical CCM Alloys in Hot Compression Process

2010 ◽  
Vol 654-656 ◽  
pp. 1275-1278 ◽  
Author(s):  
Yun Ping Li ◽  
Shingo Kurosu ◽  
Emi Onodera ◽  
Hiroaki Matsumoto ◽  
Akihiko Chiba
Keyword(s):  
Dynamic Recrystallization ◽  
Hot Forging ◽  
Stacking Faults ◽  
Recrystallization Behavior ◽  
Compression Tests ◽  
Compression Process ◽  
Continuous Dynamic Recrystallization ◽  
Computer Aided ◽  
Dynamic Recrystallization Behavior ◽  
Continuous Dynamic

Dynamic recrystallization behavior of Co-29Cr-6Mo-0.16N alloy was analyzed in details. Compression tests were carried out in a computer aided Thermecmaster- Z hot forging simulator. The results showed that uniformly distributed superfine grain size could be obtained by continuous dynamic recrystallization (DRX) process; Texture-free microstructure with uniformly distributed equiaxed fine grains was obtained. The formation of profuse stacking faults and their subsequent intersections are considered to be the principle mechanisms of DRX.

Kinetics of Dynamic Recrystallization of 18 Ni Maraging Steels

2016 ◽  
Vol 850 ◽  
pp. 13-20 ◽  
Author(s):  
Ni Li ◽  
Fei Zhao ◽  
Huan Zhang ◽  
Yong Hai Ren
Keyword(s):  
Dynamic Recrystallization ◽  
Peak Stress ◽  
Strain Rates ◽  
Recrystallization Behavior ◽  
Compression Tests ◽  
Flow Curves ◽  
Maraging Steels ◽  
Dynamic Recrystallization Behavior ◽  
Characteristic Values ◽  
Kinetics Of

The dynamic recrystallization behavior of 18 Ni maraging steels was investigated by hot compression tests at temperatures ranging from 900 °C to 1100 °C and strain rates ranging from 0.001 to 1 s-1. Based on the flow curves from the tests, the effects of temperatures and strain rates on the dynamic recrystallization behavior were analyzed. The strain-hardening rates versus stress curves were used to determine to the critical strain, the peak stress (strain), the saturated stress and the steady stress. With the assistance of the process parameters, constitutive equations were obtained and the activation energy was determined to be 413544.96 J/mol. The dependence of the characteristic values on Zener-Hollomon was found. The dynamic recrystallization kinetics model of the tested steels was constructed and the validity was confirmed based on the experimental results.

Investigation on Dynamic Recrystallization Behavior in Hot Deformed Superalloy Inconel 718

2007 ◽  
Vol 546-549 ◽  
pp. 1297-1300 ◽  
Author(s):  
Y. Wang ◽  
Wen Zhu Shao ◽  
Liang Zhen ◽  
L. Lin ◽  
Y.X. Cui
Keyword(s):  
Dynamic Recrystallization ◽  
Inconel 718 ◽  
High Angle ◽  
Twin Boundaries ◽  
Continuous Dynamic Recrystallization ◽  
Subgrain Rotation ◽  
Dynamic Recrystallization Behavior ◽  
Ebsd Technique ◽  
Continuous Dynamic ◽  
The Individual

The nucleation and development of dynamic recrystallization (DRX) in hot deformed superalloy Inconel 718 during uniaxial compression were investigated by optical microscopy and electron back-scattered diffraction (EBSD) technique. The results showed that the discontinuous dynamic recrystallization was the predominant DRX mechanism in this alloy. The variations of partial crystallographic orientations led to the individual nucleation inside the deformed grains, which implied the occurrence of local continuous dynamic recrystallization. The progressive subgrain rotation can be confirmed neither near the prior high angle grain boundaries nor within the original grains. It was found that, as the strain increased, the initial twin boundaries were gradually transformed to ordinary mobile high angle boundaries. Meanwhile, the new twin boundaries were formed inside the recrystallized grain necklaces. It was suggested that the characteristics of the twin boundaries evolution with increasing strain were associated with the transformation of initial twin boundaries as well as the generation of new ones, which resulted in the development of DRX.

Continuous Dynamic Recrystallization during Warm Deformation of Tempered Lath Martensite in a Medium Carbon Steel

2012 ◽  
Vol 508 ◽  
pp. 124-127 ◽  
Author(s):  
Un Hae Lee ◽  
Naoya Kamikawa ◽  
Goro Miyamoto ◽  
Tadashi Furuhara
Keyword(s):  
Dynamic Recrystallization ◽  
Microstructural Evolution ◽  
Boundary Migration ◽  
Lath Martensite ◽  
Medium Carbon Steel ◽  
Warm Deformation ◽  
Continuous Dynamic Recrystallization ◽  
Dynamic Recrystallization Behavior ◽  
Fine Grained Structure ◽  
Continuous Dynamic

To Understand the Mechanisms of Accelerated Dynamic Recrystallization Behavior during the Warm Deformation of Martensites, the Tempered Lath Martensite of 0.4C Steel (Fe-0.399%C-1.96%Mn in Mass %) Was Deformed at 650 °C in Compression to Different Reductions, and Microstructural Evolution Was Investigated. During the Deformation, an Initial Lath Martensite Structure with a Complicated Morphology Was Gradually Changed into More Equiaxed Structure. After 50% Reduction and above, an Equiaxed, Fine Grained Structure Mainly Surrounded by High-Angle Boundaries Was Uniformly Formed with Dislocation Substructures, where the Dislocation Density in the Grains Is Relatively Low. Since there Was No Significant Boundary Migration during this Process, this Microstructural Evolution Can Be Termed as Continuous Dynamic Recrystallization.

Effect of Deformation Temperature on Microstructure and Mechanical Properties of Low-Alloyed Copper Alloy

2018 ◽  
Vol 941 ◽  
pp. 982-987
Author(s):  
Anna Morozova ◽  
Yana Olkhovikova ◽  
Evgeniy Tkachev ◽  
Andrey Belyakov ◽  
Rustam Kaibyshev
Keyword(s):  
Mechanical Properties ◽  
Dynamic Recrystallization ◽  
Deformation Temperature ◽  
Copper Alloy ◽  
Elevated Temperatures ◽  
Initial State ◽  
Continuous Dynamic Recrystallization ◽  
Small Strains ◽  
Continuous Dynamic ◽  
Kinetics Of

The microstructure evolution and mechanical properties of a copper alloy subjected to deformation at temperatures of 20 °C and 400 °C to total strains from 1 to 4 were examined. The formation of planar low-angle boundaries with moderate misorientations occurs within initial grains at relatively small strains regardless of deformation temperature. Upon further processing the misorientations of these boundaries progressively increase and the new ultrafine grains develop. Continuous dynamic recrystallization takes place during deformation at ambient and elevated temperatures. The kinetics of dynamic recrystallization is discussed in terms of a modified Johnson-Mehl-Avrami-Kolmogorov relationship. The large plastic straining results in significant strengthening, the ultimate tensile strength increases from 190 MPa in the initial state to 440 MPa and to 400 MPa after total strain of 4 at 20 °C and 400 °C, respectively. A modified Hall-Petch relationship is applied to evaluate the contribution of grain refinement and dislocation density to the overall strengthening.

scholarly journals Microstructure, Hot Deformation Behavior, and Recrystallization Behavior of Zn-1Fe-1Mg Alloy under Isothermal Compression

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1735
Author(s):  
Penghao Xue ◽  
Minglong Ma ◽  
Yongjun Li ◽  
Xinggang Li ◽  
Jiawei Yuan ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
Deformation Behavior ◽  
Processing Map ◽  
Phase Interface ◽  
Recrystallization Behavior ◽  
Continuous Dynamic Recrystallization ◽  
Degradation Rates ◽  
The Matrix ◽  
Continuous Dynamic ◽  
Evolution Of Microstructure

Nowadays, wrought zinc-based biodegradable alloys are favored by researchers, due to their excellent mechanical properties and suitable degradation rates. However, there are few research studies on their thermal deformation behavior at present. This study took Zn-1Fe-1Mg and explored its microstructural change, deformation, recrystallization behavior and processing map by means of the thermal simulation experiment, at temperatures ranging from 235 °C to 340 °C and strain rates ranging from 10−2 s−1 to 10 s−1. The constitutive model was constructed using the Arrhenius formula. The results indicated that the evolution of microstructure included the dynamic recrystallization (DRX) of the Zn matrix, the spheroidization of the Mg2Zn11 phase, and breaking of the FeZn13 phase. The subgrains observed within the deformed grain resulted mainly from continuous dynamic recrystallization (CDRX). The precipitated FeZn13 grains overlapped with the precipitated MgZn2 from the matrix, thus forming a spine-like structure at the phase interface. After compression, the alloy possessed a strong basal texture. Affected by the change of Zn twins, textural strength decreased at first and then increased as the deformation temperature rose. There was only a small unstable region in the processing map, indicating that the alloy exhibited good machinability.

Dynamic recrystallization behavior during hot deformation of as-cast 4Cr5MoSiV1 steel

2021 ◽  
Vol 56 (14) ◽  
pp. 8762-8777
Author(s):  
Yahui Han ◽  
Changsheng Li ◽  
Jinyi Ren ◽  
Chunlin Qiu ◽  
Shuaishuai Chen ◽  
...  
Keyword(s):  
Dynamic Recrystallization ◽  
Hot Deformation ◽  
Recrystallization Behavior ◽  
Dynamic Recrystallization Behavior
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