Hot deformation behavior of C276 superalloy in shifted strain rate compression: experiments and cellular automaton modelling

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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Influence of temperature and strain rate on hot deformation behavior of Zr50Ti50 alloy in single β field

Transactions of Nonferrous Metals Society of China ◽

10.1016/s1003-6326(16)64288-7 ◽

2016 ◽

Vol 26 (8) ◽

pp. 2086-2093 ◽

Cited By ~ 5

Author(s):

Yun-kai ZHOU ◽

Zhi-hao FENG ◽

Chao-qun XIA ◽

Wen-chang LIU ◽

Qin JING ◽

...

Keyword(s):

Strain Rate ◽

Hot Deformation ◽

Deformation Behavior ◽

Hot Deformation Behavior ◽

Influence Of Temperature

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Hot Deformation Behavior and Microstructure Evolution of Cu–Ni–Co–Si Alloys

Materials ◽

10.3390/ma13092042 ◽

2020 ◽

Vol 13 (9) ◽

pp. 2042 ◽

Cited By ~ 2

Author(s):

Feng Liu ◽

Jimiao Ma ◽

Lijun Peng ◽

Guojie Huang ◽

Wenjing Zhang ◽

...

Keyword(s):

Strain Rate ◽

Hot Deformation ◽

Deformation Behavior ◽

Strain Rate Range ◽

High Temperature Deformation ◽

Temperature Deformation ◽

Hot Deformation Behavior ◽

Deformation Activation Energy ◽

The Matrix ◽

Dynamic Recrystallization Behavior

The Cu-1.7Ni-1.4Co-0.65Si (wt%) alloy is hot compressed by a Gleeble-1500D machine under a temperature range of 760 to 970 °C and a strain rate range of 0.01 to 10 s−1. The flow stress increases with the extension of strain rate and decreases with the rising of deformation temperature. The dynamic recrystallization behavior happens during the hot compression deformation process. The hot deformation activation energy of the alloy can be calculated as 468.5 kJ/mol, and the high temperature deformation constitutive equation is confirmed. The hot processing map of the alloy is established on the basis of hot deformation behavior and hot working characteristics. With the optimal thermal deformation conditions of 940 to 970 °C and 0.01 to 10 s−1, the fine equiaxed grain and no holes are found in the matrix, which can provide significant guidance for hot deformation processing technology of Cu–Ni–Co–Si alloy.

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Hot Deformation Behavior and Microstructure of U720Li Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.709.143 ◽

2013 ◽

Vol 709 ◽

pp. 143-147 ◽

Cited By ~ 8

Author(s):

Tao Wang ◽

Zhao Li ◽

Shu Hong Fu ◽

Yong Zhang ◽

Yu Xin Zhao ◽

...

Keyword(s):

Grain Size ◽

Flow Stress ◽

Strain Rate ◽

Hot Deformation ◽

Deformation Behavior ◽

Primary Phase ◽

Compression Tests ◽

Hot Deformation Behavior ◽

Fine Grain ◽

Lower Strain

The hot deformation behavior of U720Li was investigated by isothermal compression tests at temperature ranging from 1060-1180°C and strain rate from 0.001s-1 to 20s-1. The flow stress-strain curves and microstructures were investigated and a constitutive equation was established. It is found that flow stress is sensitive to stain rate and deformation temperature greatly. The higher stain rate resultes in a larger fluctuation in flow stress. The hot deformation activation energy is determined to be 552.8kJ/mol. Grain size increases with increasing temperature and decreases firstly and then increases with increasing strain rate. U720Li alloy should be deformed below the solve temperature of γ primary phase with lower strain rate in order to obtain the even and fine grain size.

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Hot deformation behavior of TC18 titanium alloy

Thermal Science ◽

10.2298/tsci1305523j ◽

2013 ◽

Vol 17 (5) ◽

pp. 1523-1528

Author(s):

Bao-Hua Jia ◽

Wei-Dong Song ◽

Hui-Ping Tang ◽

Jian-Guo Ning

Keyword(s):

Titanium Alloy ◽

Flow Stress ◽

Strain Rate ◽

Hot Deformation ◽

Deformation Behavior ◽

True Strain ◽

Testing Machine ◽

Constitutive Relationship ◽

Compression Tests ◽

Hot Deformation Behavior

Isothermal compression tests of TC18 titanium alloy at the deformation temperatures ranging from 25?C to 800?C and strain rate ranging from 10-4 to 10-2 s-1 were conducted by using a WDW-300 electronic universal testing machine. The hot deformation behavior of TC18 was characterized based on an analysis of the true stress-true strain curves of TC18 titanium alloy. The curves show that the flow stress increases with increasing the strain rate and decreases with increasing the temperature, and the strain rate play an important role in the flow stress when increasing the temperatures. By taking the effect of strain into account, an improved constitutive relationship was proposed based on the Arrhenius equation. By comparison with the experimental results, the model prediction agreed well with the experimental data, which demonstrated the established constitutive relationship was reliable and can be used to predict the hot deformation behavior of TC18 titanium alloy.

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Modeling the Hot Deformation Behavior of 1565ch Aluminum Alloy

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.684.35 ◽

2016 ◽

Vol 684 ◽

pp. 35-41 ◽

Cited By ~ 3

Author(s):

S.V. Rushchits ◽

E.V. Aryshensky ◽

S.M. Sosedkov ◽

A.M. Akhmed'yanov

Keyword(s):

Aluminum Alloy ◽

Flow Stress ◽

Strain Rate ◽

Hot Deformation ◽

Deformation Behavior ◽

Static Recrystallization ◽

Strain Rates ◽

Strain Resistance ◽

Hot Deformation Behavior ◽

Zirconium Addition

The deformation behavior of 1565ch alloy under the plane-strain conditions in the temperature range of 350–490 оС and strain rates range of 0,1–10 s-1 is studied. The expression for steady flow stress as the functions of temperature of deformation and strain rate is obtained. It is established that 1565ch alloy with zirconium addition shows higher strain resistance and less tendency to dynamic and static recrystallization than AMg6.

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Effect of Nitrogen Content on Hot Deformation Behavior and Grain Growth in Nuclear Grade 316LN Stainless Steel

Advances in Materials Science and Engineering ◽

10.1155/2015/427945 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8 ◽

Cited By ~ 3

Author(s):

Ming-wei Guo ◽

Zhen-hua Wang ◽

Ze-an Zhou ◽

Shu-hua Sun ◽

Wan-tang Fu

Keyword(s):

Stainless Steel ◽

Dynamic Recrystallization ◽

Strain Rate ◽

Grain Growth ◽

Strain Rate Sensitivity ◽

Hot Deformation ◽

Deformation Behavior ◽

Rate Sensitivity ◽

Processing Maps ◽

Hot Deformation Behavior

316LN stainless steel with 0.08%N (08N) and 0.17%N (17N) was compressed at 1073–1473 K and 0.001–10 s−1. The hot deformation behavior was investigated using stress-strain curve analysis, processing maps, and so forth. The microstructure was analyzed through electron backscatter diffraction analysis. Under most conditions, the deformation resistance of 17N was higher than that of 08N. This difference became more pronounced at lower temperatures. The strain rate sensitivity increased with increasing temperature for types of steel. In addition, the higher the N content, the higher the strain rate sensitivity. Hot deformation activation energy increased from 487 kJ/mol to 549 kJ/mol as N concentration was increased from 0.08% to 0.17%. The critical strain for initiation of dynamic recrystallization was lowered with increasing N content. In the processing maps, both power dissipation ratio and unstable region increased with increasing N concentration. In terms of microstructure evolution, N promoted dynamic recrystallization kinetic and decreased dynamic recrystallization grain size. The grain growth rate was lower in 17N than in 08N during heat treatment. Finally, it was found that N favored twin boundary formation.

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Hot Deformation Behavior and Microstructure Evolution of a DC Cast Hypereutectic Al-Si Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.151.332 ◽

2012 ◽

Vol 151 ◽

pp. 332-336

Author(s):

Ke Zhun He ◽

Fu Xiao Yu ◽

Da Zhi Zhao ◽

Liang Zuo

Keyword(s):

Strain Rate ◽

Microstructure Evolution ◽

Hot Deformation ◽

Deformation Behavior ◽

Deformation Temperature ◽

Peak Stress ◽

Strain Rate Range ◽

Hot Deformation Behavior ◽

Strong Function ◽

Primary Si

The hot deformation behavior and microstructure evolution of a DC cast hypereutectic Al-Si alloy was studied in the temperature range of 400-500 °C and strain rate range of 0.001-1 s-1. The results show that the as-cast microstructure of the alloy consists of polygonal primary Si particles and α-aluminum dendritic halos with Al-Si eutectics and intermetallic compounds segregated into the interdendritic regions. The flow stress of the alloy is a strong function of temperature and strain rate, and the peak stress is increased with the decrease of deformation temperature and the increase of strain rate. All the true stress-true stain curves in the experiments exhibit dynamic softening. The fracture frequency of primary Si particle is decreased with the increase of deformation temperature and the decrease of strain rate. The dynamic flow softening is mainly as a result of dynamic recrystallization.

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Hot deformation behavior of 60NiTi shape-memory alloy fabricated by hot isostatic pressing

Materials Research Express ◽

10.1088/2053-1591/ac487e ◽

2022 ◽

Author(s):

Mei-ling Li ◽

Wen-jin Gao ◽

Ying-hao Zhou

Keyword(s):

Flow Stress ◽

Strain Rate ◽

Work Hardening ◽

Hot Deformation ◽

Deformation Behavior ◽

Dynamic Equilibrium ◽

High Stress ◽

Cylindrical Sample ◽

Hot Working ◽

Hot Deformation Behavior

Abstract The 60NiTi (Ni60wt%–Ti40wt%) intermetallic is a hard-to-process material. Understanding of hot deformation behavior is crucial for the hot working of 60NiTi. This work studied hot deformation behavior and corresponding microstructure of the hot isostatic pressed 60NiTi in the temperature range of 900 °C–1050 °C and at strain rates of 0.1, 0.01, and 0.001 s-1 through a hot compression test. The flow stress and microstructure were susceptible to the hot deformation parameters. The flow stress decreased with the increase in deformation temperature and decrease in strain rate. Work hardening occurred at a small strain, then followed by softening; finally, near-dynamic equilibrium was achieved between work hardening and softening. A constitutive equation was developed to describe the effects of strain rate and temperature on flow stress. Simulation of hot deformation via the finite element method revealed the workpiece’s inhomogeneous deformation. The deformation occurred mainly in the center area of the cylindrical sample, resulting in high stress and strain concentrations in this region and causing the equiaxial grains to be compressed into prolate grains. This work can provide guidance for the hot working, such as forging and hot rolling, of 60NiTi.

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