Experimental investigation of the hot deformation behavior of AA7075: Development and comparison of flow localization parameter and dynamic material model processing maps

The hot deformation behavior of a new Al–Mn–Sc alloy was investigated by hot compression conducted at temperatures from 330 to 490 °C and strain rates from 0.01 to 10 s−1. The hot deformation behavior and microstructure of the alloy were significantly affected by the deformation temperatures and strain rates. The peak flow stress decreased with increasing deformation temperatures and decreasing strain rates. According to the hot deformation behavior, the constitutive equation was established to describe the steady flow stress, and a hot processing map at 0.4 strain was obtained based on the dynamic material model and the Prasad instability standard, which can be used to evaluate the hot workability of the alloy. The developed hot processing diagram showed that the instability was more likely to occur in the higher Zener–Hollomon parameter region, and the optimal processing range was determined as 420–475 °C and 0.01–0.022 s−1, in which a stable flow and a higher power dissipation were achieved.

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Research on the Hot Deformation Behavior of the Casting NiTi Alloy

Materials ◽

10.3390/ma14206173 ◽

2021 ◽

Vol 14 (20) ◽

pp. 6173

Author(s):

Chengchuang Tao ◽

Hongjun Huang ◽

Ge Zhou ◽

Bowen Zheng ◽

Xiaojiao Zuo ◽

...

Keyword(s):

Strain Rate ◽

Hot Deformation ◽

Deformation Behavior ◽

Niti Alloy ◽

Rate Sensitivity ◽

Material Model ◽

Instability Criterion ◽

Hot Deformation Behavior ◽

Dynamic Material Model ◽

Ti2ni Phase

The hot deformation behavior and processing maps of the casting NiTi alloy were studied at the deformation temperature of 650–1050 °C and the strain rate of 5 × 10−3–1 s−1 by Gleeble-3800 thermal simulating tester. The variation of the strain rate sensitivity exponent m and the activation energy Q under different deformation conditions (T = 650–1050 °C, ε˙ = 0.005–1 s−1) were obtained. The formability of the NiTi alloy was the best from 800 °C to 950 °C. The constitutive equation of the casting NiTi alloy was constructed by the Arrhenius model. The processing map of the casting NiTi alloy was plotted according to the dynamic material model (DMM) based on the Prasad instability criterion. The optimal processing areas were at 800–950 °C and 0.005–0.05 s−1. The microstructure of the casting NiTi alloy was analyzed by TEM, SEM and EBSD. The softening mechanisms of the casting NiTi alloy were mainly dynamic recrystallization of the Ti2Ni phase and the nucleation and growth of fine martensite.

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Characterization of hot deformation behavior of wear-resistant steel BTW1 using processing maps and constitutive equations

Journal of Iron and Steel Research International ◽

10.1007/s42243-018-0154-8 ◽

2018 ◽

Vol 25 (10) ◽

pp. 1054-1061 ◽

Cited By ~ 5

Author(s):

Peng-tao Liu ◽

Qing-xue Huang ◽

Li-feng Ma ◽

Tao Wang

Keyword(s):

Constitutive Equations ◽

Hot Deformation ◽

Deformation Behavior ◽

Processing Maps ◽

Resistant Steel ◽

Hot Deformation Behavior ◽

Wear Resistant

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Hot deformation behavior and processing maps of B and Gd containing β-solidified TiAl based alloy

Intermetallics ◽

10.1016/j.intermet.2018.01.004 ◽

2018 ◽

Vol 94 ◽

pp. 138-151 ◽

Cited By ~ 14

Author(s):

V.S. Sokolovsky ◽

N.D. Stepanov ◽

S.V. Zherebtsov ◽

N.A. Nochovnaya ◽

P.V. Panin ◽

...

Keyword(s):

Hot Deformation ◽

Deformation Behavior ◽

Processing Maps ◽

Hot Deformation Behavior

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Experimental and Numerical Investigations on Hot Deformation Behavior and Processing Maps for ASS 304 and ASS 316

High Temperature Materials and Processes ◽

10.1515/htmp-2017-0047 ◽

2018 ◽

Vol 37 (9-10) ◽

pp. 873-888 ◽

Cited By ~ 3

Author(s):

Nitin Kotkunde ◽

Hansoge Nitin Krishnamurthy ◽

Swadesh Kumar Singh ◽

Gangadhar Jella

Keyword(s):

Experimental Data ◽

Strain Rate ◽

Hot Deformation ◽

Deformation Behavior ◽

Constitutive Models ◽

Tensile Tests ◽

Uniaxial Tensile ◽

Processing Maps ◽

Hot Deformation Behavior ◽

Statistical Measures

AbstractA thorough understanding of hot deformation behavior plays a vital role in determining process parameters of hot working processes. Firstly, uniaxial tensile tests have been performed in the temperature ranges of 150 °C–600 °C and strain rate ranges of 0.0001–0.01s−1 for analyzing the deformation behavior of ASS 304 and ASS 316. The phenomenological-based constitutive models namely modified Fields–Backofen (m-FB) and Khan–Huang–Liang (KHL) have been developed. The prediction capability of these models has been verified with experimental data using various statistical measures. Analysis of statistical measures revealed KHL model has good agreement with experimental flow stress data. Through the flow stresses behavior, the processing maps are established and analyzed according to the dynamic materials model (DMM). In the processing map, the variation of the efficiency of the power dissipation is plotted as a function of temperature and strain rate. The processing maps results have been validated with experimental data.

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An investigation on the hot deformation behavior and processing maps of Co-Ni-Cr-W-based superalloy

Journal of Manufacturing Processes ◽

10.1016/j.jmapro.2021.11.060 ◽

2022 ◽

Vol 74 ◽

pp. 100-111

Author(s):

Shengli Guo ◽

Shuaishuai Wu ◽

Jiangtao Guo ◽

Yazhao Shen ◽

Wei Zhang

Keyword(s):

Hot Deformation ◽

Deformation Behavior ◽

Processing Maps ◽

Hot Deformation Behavior

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Hot Deformation Behavior Considering Strain Effects and Recrystallization Mechanism of an Al-Zn-Mg-Cu Alloy

Materials ◽

10.3390/ma13071743 ◽

2020 ◽

Vol 13 (7) ◽

pp. 1743 ◽

Cited By ~ 3

Author(s):

Lei Luo ◽

Zhiyi Liu ◽

Song Bai ◽

Juangang Zhao ◽

Diping Zeng ◽

...

Keyword(s):

Dynamic Recrystallization ◽

Hot Deformation ◽

Deformation Behavior ◽

Processing Parameters ◽

Strain Rate Range ◽

Hot Compression ◽

Processing Maps ◽

Hot Deformation Behavior ◽

Recrystallization Mechanism ◽

Cu Alloy

The hot deformation behavior of an Al-Zn-Mg-Cu alloy was investigated by hot compression test at deformation temperatures varying from 320 to 440 °C with strain rates ranging from 0.01 to 10 s−1. The results show that the Mg(Zn, Cu)2 particles as a result of the sufficient static precipitation prior to hot compression have an influence on flow softening. A constitutive model compensated with strain was developed from the experimental results, and it proved to be accurate for predicting the hot deformation behavior. Processing maps at various strains were established. The microstructural evolution demonstrates that the dominant dynamic softening mechanism stems from dynamic recovery (DRV) and partial dynamic recrystallization (DRX). The recrystallization mechanism is continuous dynamic recrystallization (CDRX). The microstructure observations are in good agreement with the results of processing maps. On account of the processing map and microstructural observation, the optimal hot processing parameters at a strain of 0.6 are at deformation temperature range of 390–440 °C and strain rate range of 0.010–0.316 s−1 with a peak efficiency of 0.390.

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