Hot deformation behaviors and processing maps of Mg–Zn–Er alloys based on Gleeble–1500 hot compression simulation

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.

Download Full-text

Hot Deformation Behaviors of SiCp/Al Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1058.165 ◽

2014 ◽

Vol 1058 ◽

pp. 165-169 ◽

Cited By ~ 1

Author(s):

Shi Ming Hao ◽

Jing Pei Xie

Keyword(s):

Flow Stress ◽

Strain Rate ◽

Hot Deformation ◽

True Strain ◽

Constant Strain Rate ◽

Hot Compression ◽

Compression Tests ◽

Sensitive Material ◽

2024 Aluminum Alloy ◽

Deformation Behaviors

The hot deformation behaviors of 30%SiCp/2024 aluminum alloy composites was studied by hot compression tests using Gleeble-1500 thermomechanical simulator at temperatures ranging from 350-500°C under strain rates of 0.01-10 s-1. The true stress-true strain curves were obtained in the tests. Constitutive equation and processing map were established. The results show that the flow stress decreases with the increase of deformation temperature at a constant strain rate, and increases with the increase of strain rate at constant temperature, indicating that composite is a positive strain rate sensitive material. The flow stress behavior of composite during hot compression deformation can be represented by a Zener-Hollomon parameter in the hyperbolic sine form. Its activation energy for hot deformation Q is 183.251 kJ/mol. The optimum hot working conditions for this material are suggested.

Download Full-text

Hot-Deformation Behavior and Hot-Processing Maps of AISI 410 Martensitic Stainless Steel

High Temperature Materials and Processes ◽

10.1515/htmp-2015-0145 ◽

2016 ◽

Vol 35 (9) ◽

pp. 929-940

Author(s):

Rong-Sheng Qi ◽

Miao Jin ◽

Bao-Feng Guo ◽

Xin-Gang Liu ◽

Lei Chen

Keyword(s):

Stainless Steel ◽

High Temperatures ◽

Hot Deformation ◽

Martensitic Stainless Steel ◽

Ferrite Content ◽

Optimum Process ◽

Processing Maps ◽

Delta Ferrite ◽

Deformation Behaviors ◽

Measured Flow

AbstractThe compressive deformation behaviors of 410 martensitic stainless steel were investigated on a Gleeble-1500 thermomechanical simulator, and the experimental stress–strain data were obtained. The measured flow stress was corrected for friction and temperature. A constitutive equation that accounts for the influence of strain was established, and the hot-processing maps at different strain were plotted. The microstructure evolution of the hot-deformation process was studied on the basis of microstructural observations at high temperatures. Phase-transformation experiments on 410 steel were conducted at high temperatures to elucidate the effects of temperature on the delta-ferrite content. The initial forging temperature and optimum process parameters were obtained on the basis of the processing map and the changes in the delta-ferrite content at high temperatures.

Download Full-text

Hot Deformation Behaviors and Processing Maps of 2024 Aluminum Alloy in As-cast and Homogenized States

Journal of Materials Engineering and Performance ◽

10.1007/s11665-015-1734-4 ◽

2015 ◽

Vol 24 (12) ◽

pp. 5002-5012 ◽

Cited By ~ 21

Author(s):

Liang Chen ◽

Guoqun Zhao ◽

Jie Gong ◽

Xiaoxue Chen ◽

Mengmeng Chen

Keyword(s):

Aluminum Alloy ◽

Hot Deformation ◽

Processing Maps ◽

2024 Aluminum Alloy ◽

Deformation Behaviors

Download Full-text

Hot Deformation and Processing Map of C919 Aluminum Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.816.810 ◽

2015 ◽

Vol 816 ◽

pp. 810-817

Author(s):

Yong Biao Yang ◽

Zhi Min Zhang ◽

Xing Zhang

Keyword(s):

Aluminum Alloy ◽

Flow Stress ◽

Strain Rate ◽

Hot Deformation ◽

Testing Machine ◽

Strain Rate Range ◽

Hot Compression ◽

Strain Rates ◽

Processing Maps ◽

Compression Tests

The hot deformation behaviors of Aluminum alloy C919 were studied in the present investigation. The hot compression tests for C919 were carried out in the temperature range of 350°C~470°C and strain rates range of 0.001s-1~1s-1 using GLEEBLE-1500 thermal simulate testing machine. Optical microscopy (OM) was used for the microstructure characterization. The experimental results showed that the flow stress of C919 aluminum alloy decreased with increasing temperature and decreasing strain rates and the flow stress curves tended to increase at a strain rate of 1s-1 with increasing strain, while the flow stresses kept with increasing strain at lower strain rate. The alloys were more prone to dynamic recrystallization with decreasing strain rates during hot deformation. The hot compression behavior of C919 aluminum alloy can be described as hyperbolic sine function corrected Arrhenius relation. The processing maps for the alloy were built at a strain of 0.6. The instability deformation domain occurred at temperatures range from 350°C and 380°C and at a strain rate of 0.1-1s-1. Based on the processing maps and microstructure observations, the optimum hot-working parameters were determined to be at a temperature of 470°C in the strain rate range from 0.1-0.01s−1 for the C919 aluminum alloy.

Download Full-text

Flow and Densification Behaviors of Sintered P/F-10C50 Steel under Hot Compression

Materials Science Forum ◽

10.4028/www.scientific.net/msf.849.811 ◽

2016 ◽

Vol 849 ◽

pp. 811-818

Author(s):

Biao Guo ◽

Chang Chun Ge ◽

Yi Xu ◽

Qiu Yan Lu ◽

Sui Cai Zhang

Keyword(s):

Constitutive Equation ◽

Strain Rate ◽

Hot Deformation ◽

Deformation Temperature ◽

Hot Compression ◽

Compression Tests ◽

Sintered Steel ◽

Absolute Relative Error ◽

Average Absolute Relative Error ◽

Deformation Behaviors

The hot deformation and densification behaviors of sintered P/F-10C50 steel were investigated by hot compression tests on Gleeble-1500 thermal mechanical simulator at the temperature ranging from 900 °C to 1000 °C and the strain rate ranging from 0.1 s-1 to 10 s-1. The flow and densification characteristics of the tested specimens at different deformation temperatures and strain rates were studied. The flow stress of the sintered steel persistently increases until the end of the test as the result of matrix and geometric work hardening. The higher deformation temperature and strain rate are conductive to the healing of the pores and promote the densification of the sintered steel, while the higher deformation temperature and lower strain rate impede the densification. The constitutive equation of the sintered steel is established by the means of stepwise regression. The flow stresses predicted by the established constitutive equation are in good agreement with the experimental values, and the correlation coefficient (R) and the average absolute relative error (AARE) are 0.9931 and 3.52%, respectively. These results demonstrate the hot deformation behaviors of the sintered P/F-10C50 steel are excellently predicted by the established constitutive equation.

Download Full-text

Hot Deformation Behaviors of SiCp/2024 Aluminum Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.833.271 ◽

2013 ◽

Vol 833 ◽

pp. 271-275

Author(s):

Shi Ming Hao ◽

Jing Pei Xie

Keyword(s):

Flow Stress ◽

Strain Rate ◽

Hot Deformation ◽

True Strain ◽

Constant Strain Rate ◽

Hot Compression ◽

Compression Tests ◽

Sensitive Material ◽

2024 Aluminum Alloy ◽

Deformation Behaviors

The hot deformation behaviors of 30%SiCp/2024 aluminum alloy composites was studied by hot compression tests using Gleeble-1500 thermomechanical simulator at temperatures ranging from 350-500 °C under strain rates of 0.01-10 s-1. The true stress-true strain curves were obtained in the tests. Constitutive equation and processing map were established. The results show that the flow stress decreases with the increase of deformation temperature at a constant strain rate, and increases with the increase of strain rate at constant temperature, indicating that composite is a positive strain rate sensitive material. The flow stress behavior of composite during hot compression deformation can be represented by a Zener-Hollomon parameter in the hyperbolic sine form. Its activation energy for hot deformation Q is 153.251 kJ/mol. The optimum hot working conditions for this material are suggested.

Download Full-text