Hot Deformation Characteristics and Processing Map Analysis of Pre-Forged AZ80 Magnesium Alloy

Huang, Shiquan; Lu, Minxu; Luo, Sheng-lan; He, Hailin; Yi, Youping

doi:10.1007/s12540-019-00452-7

Cited by 9 publications

(4 citation statements)

References 39 publications

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“…As shown in Figure 2, in the local magnification plots of 0.1 and 5 s −1 strain rates, the curves do not have rheological stress crossover, indicating that the steel still maintains negative temperature sensitivity. [ 18 ] Due to the shortened nucleation time of the recrystallized grains, the softening effect of the steel was weakened. Therefore, the stress increased with the increasing strain rate.…”

Section: Resultsmentioning

confidence: 99%

“…[ 21 ] It is usually closely associated with complex dislocation motion processes and subsequent dynamic softening behavior. [ 18,22 ] Thus, at the same strain rate, the value of Q can be calculated by taking the partial differential of Equation (7):

\text{Q} = \text{1000Rn} \frac{\partial \text{ln[sinh(&amp;#x00026;amp;amp;amp;alpha;&amp;#x00026;amp;amp;amp;sigma;)} \left]\right. }{\partial \text{(1/T)}} = \text{1000RnS}

…”

Section: Resultsmentioning

confidence: 99%

“…[21] It is usually closely associated with complex dislocation motion processes and subsequent dynamic softening behavior. [18,22] Thus, at the same strain rate, the value of Q can be calculated by taking the partial differential of Equation ( 7):…”

Section: Constitutive Model With Strain Compensationmentioning

confidence: 99%

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Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Feng,

Zhang,

Zhang

et al. 2023

steel research int.

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Low‐carbon microalloyed steel with the microstructure of bainite is frequently utilized to produce automotive parts. The systematic investigation of the hot deformation behavior can serve as a reference for the optimization of deformation process parameters. The hot deformation of 0.2C–2.0Mn–0.5Cr microalloyed steel is studied. Based on the stress–strain curve, an Arrhenius model with strain compensation is established. The correlation coefficient R2 and the average absolute relative error calculated according to this model are 0.962 and 4.871%. The microstructure evolution at the strain of 0.90 is studied. In the stable region with substantial power dissipation, the microstructure is uniformly fine. The strain rate is high in the stable region with low‐power dissipation, and the room‐temperature microstructure after deformation retains a large amount of deformation storage energy and fine substructures. During deformation, the banded structures are formed in the instable region. The difference in dislocation density between the band structure and the nearby regions promotes the formation of necklace microstructures. Therefore, the 0.2C–2.0Mn–0.5Cr microalloyed steel has an ideal deformation process window in the range of a hot deformation temperature of 880–920 °C and a strain rate of 0.1–0.3 s−1.

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Section: Resultsmentioning

confidence: 99%

\text{Q} = \text{1000Rn} \frac{\partial \text{ln[sinh(&amp;#x00026;amp;amp;amp;alpha;&amp;#x00026;amp;amp;amp;sigma;)} \left]\right. }{\partial \text{(1/T)}} = \text{1000RnS}

…”

Section: Resultsmentioning

confidence: 99%

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Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Feng,

Zhang,

Zhang

et al. 2023

steel research int.

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“…Ductility is less affected by grain size for magnesium AZ31 ring. Shi quan et al [12] investigated the deformation behaviour of AZ80 magnesium alloy and determined the optimum deformation condition as 623-683 K and 0.0001-0.1s-1.…”

Section: Introductionmentioning

confidence: 99%

Closed Die Hot Forging Process Analysis using Qform

Tripathy¹

2021

RDMS

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Forging is widely adopted manufacturing method in automotive machine parts, aerospace components due to the good quality, high efficiency and less scrap generated by the process in comparison to other manufacturing methods. After heat treatment it gives comparatively good mechanical properties and fine grains which are advantageous for components used in high load conditions. In metal forging, to get desired shape and properties of product parameters like material selection, design parameter optimization, process parameter optimization is implemented which will lead to good microstructure. In closed die hot forging, which is one of the oldest forging processes, deformation occurs on metals having temperature more than its recrystalline temperature. Deformation occurs between two dies to shape the metal in the die cavity under an external pressure. In this paper simulation of closed die forging of an automotive component carried out using commercially available Q form software package. Analysis of material filling, temperature and stress profile done using Q form. Various factors like workpiece temperature, initial die temperature, shape of the die-cavity, stress and strain-rate influence the forging process. Contact between die and billet during deformation induces stress on both die and workpiece. This stress has direct impact on metal flow, die filling and life of die. Strain rate also plays a vital role in metal flow, microstructure of the component. So, it is important to study the stress profile of the process in various stage to predict the optimize shape of the die cavity, temperature and load required for the process. Finite element simulation is the method by which the process can be carried out using a software package.

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Effect of Process Variables in Closed Die Hot Forging Process: A Review

Biswal

Tripathy

2021

Lecture Notes in Mechanical Engineering

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Hot Deformation Characteristics and Processing Map Analysis of Pre-Forged AZ80 Magnesium Alloy

Cited by 9 publications

References 39 publications

Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Constitutive Modeling for Flow Stress and Processing Maps of a 0.2C–2.0Mn–0.5Cr Microalloyed Steel

Closed Die Hot Forging Process Analysis using Qform

Effect of Process Variables in Closed Die Hot Forging Process: A Review

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