Henan Key Laboratory of Advanced Non Ferrous Materials

Henan’an, China

Henan Key Laboratory of Advanced Non Ferrous Materials

Henan’an, China
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Yang Z.-Q.,Henan University of Science and Technology | Liu Y.,Henan University of Science and Technology | Liu Y.,Henan Collaborative Innovation Center for Non Ferrous Materials General Technology | Tian B.-H.,Henan University of Science and Technology | And 3 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2013

The true stress-true strain curves of 20 vol% TiC particle reinforced dispersion-strengthened copper matrix composite were investigated by compression tests at 450-850°C with the strain rate of 0.001-1 s-1 using the Gleeble-1500D simulator. The dynamic recrystallization critical conditions were established according to the work hardening rate approach. The results show that the softening mechanism of the dynamic recrystallization is a feature of flow stress-strain curves of the composites, and the peak stress increases with the decreasing deformation temperature or the increasing strain rate. The inflection point in the lnθ-ε curve appears and minimum value of -∂(lnθ)/∂ε-ε curve is presented when the critical state is attained for this composite. The critical strain and peak critical decrease with the decreasing strain rate and the increasing deformation temperature. There is linear relationship between critical strain and peak strain, i. e. εc/εp=0.5276.


Liu Y.,Henan Key Laboratory of Advanced Non Ferrous Materials | Liu X.-L.,Hebi Vocation and Technology College | Zhang J.-D.,Henan Key Laboratory of Advanced Non Ferrous Materials
Jinshu Rechuli/Heat Treatment of Metals | Year: 2011

The mechanical properties and wear resistance of Crl2MoV steel with different deep cryogenic treatments(DCT) were investigated. The results show that the hardness of Crl2MoV steel is improved obviously by the deep cryogenic treatment, the highest increment of microhardness reaches 228 HVO. 2, and the wear resistance is enhanced too. Tempered at 180 °C for 1. 5 h after 3 times deep cryogenic treatment for 1 h, the Crl2MoV steel has the best wear resistance, and its rate of wear loss dropped 37. 1%. Moreover, the retained austenite content decreases obviously to 2. 58% due to the deep cryogenic treatment compared to that of 34. 35% before deep cryogenic treatment. The percent reduction of retained austenite is 92. 5%.


Yang Z.-Q.,Henan University of Science and Technology | Liu Y.,Henan University of Science and Technology | Liu Y.,Henan Key Laboratory of Advanced Non Ferrous Materials | Tian B.-H.,Henan University of Science and Technology | And 3 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2014

In VDBF-250 vacuum hot pressing sintering furnace, 10vol% TiC/Cu-Al2O3 composite was prepared by vacuum-pressed sintering. Using the Gleeble-1500D simulator, the high-temperature plastic deformation behavior and processing map of 10vol% TiC/Cu-Al2O3 composite was investigated at 450-850°C with the strain rate of 0.001-1 s-1 and total strain of 0.7. The results show that the density, microhardness and electrical conductivity of the composite are 98.53%, 158 HV and 48.7% IACS. The softening mechanism of the dynamic recrystallization was a feature of high-temperature flow stress-strain curves of the composites, and the peak stress increased with the decrease of deformation temperature or the increase of strain rate, and belong to temperature and strain rate sensitive material. Meanwhile, the obtained processing map of dynamic material modeling was used to analyze the deformation mechanism and the destabilization mechanism of 10vol% TiC/Cu-Al2O3 composite, the optimal deformation processing parameters of the deformation temperatures range and the strain rates range were 750-850°C and 0.01-0.1 s-1.


Liu Y.,Henan University of Science and Technology | Liu Y.,Henan Key Laboratory of Advanced Non Ferrous Materials | Zhao R.,Henan University of Science and Technology | Tian B.,Henan University of Science and Technology | And 2 more authors.
Rare Metals | Year: 2011

The hot compression behaviors of W-50%Cu composite were investigated at the strain rate range from 0.01 to 5.00 s -1 and the temperature range from 850 to 1000 °C on Gleeble-1500D hot simulator. The results show that the flow stress during hot compression of W-50%Cu composite is strongly affected by the compression temperature and the strain rate. Moreover, the flow stress decreases with the raising deforming temperature, and increases with the increasing strain rate. The flow stress of the W-50%Cu composite at high temperature can be expressed by Arrhenius model, and the values of structural factor A, stress scale parameter a, stress index n and hot deformation activation Q are 3.18 × 109 s -1, 0.0133 MPa -1, 6.27393 and 239.442 kJ/mol, respectively. © The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg 2011.


Sun Y.-W.,Henan University of Science and Technology | Liu Y.,Henan University of Science and Technology | Liu Y.,Henan Key Laboratory of Advanced Non Ferrous Materials | Tian B.-H.,Henan University of Science and Technology | And 4 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2012

Using the Gleeble-1500D thermal simulator, the high-temperature plastic deformation behavior and processing map of 30%Mo/Cu-Al 2O 3 composite were investigated at 450-750°C with the strain rate of 0.01-5s -1 and total strain of 0.7. The results show that the softening mechanism of dynamic recrystallization is a feature of high-temperature flow stress-strain curves of 30%Mo/Cu-Al 2O 3 composite, and the peak stress increases with the decreased deformation temperature or the increased strain rate. Based on the true stress-strain curves, the established constitutive equation represents the high-temperature flow behavior of 30%Mo/Cu-Al 2O 3 composite, and the calculated results of the flow stress are in good agreement with the experimental results of the high-temperature deformation. Meanwhile, the obtained processing map of dynamic material modeling is used to analyze the deformation mechanism and the destabilization mechanism of 30%Mo/Cu-Al 2O 3 composite, the optimal deformation processing parameters of the deformation temperatures rang and the strain rates rang are 650-750°C, and 0.01-0.1 s -1, respectively.


Liu Y.,Henan University of Science and Technology | Liu Y.,Henan Key Laboratory of Advanced Non Ferrous Materials | Sun Y.-W.,Henan University of Science and Technology | Tian B.-H.,Henan University of Science and Technology | And 4 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2013

The 20%Mo/Cu-Al2O3 composites were prepared by vacuum-pressed in situ internal oxidation sintering, their properties and microstructures were tested and observed, respectively. Using the Gleeble-1500D thermal simulator, the relationship between the flow stress and strain during the hot deformation process of the 20%Mo/Cu-Al2O3 composites was investigated at temperature of 350-750 °C, strain rate of 0.01-5 s-1 and total strain of 0.5. The results show that the microstructures of the 20%Mo/Cu-Al2O3 composites well distribute, no aggregate phenomena and holes are observed, and the density is relatively high. The in situ internal oxidation generated nano Al2O3 particles distribute dispersively, which enhances the body strength of the composites. The softening mechanism of dynamic recrystallization of the composites is a feature for the high-temperature flow stress-strain curves of the composite, and the peak stress increases with the decrease of deformation temperature or the increase of strain rate. Based on the true stress-true strain curves, the established constitutive equation represents the high-temperature flow behavior of the composite, and the calculated results of the flow stress are in good agreement with the experimental results of the high-temperature deformation.


Wang H.G.,Henan University of Science and Technology | Wang H.G.,Henan Key Laboratory of Advanced Non Ferrous Materials | Wang F.,Luoyang Ship Material Research Institute | Song Y.P.,Henan University of Science and Technology | Song Y.P.,Henan Key Laboratory of Advanced Non Ferrous Materials
Applied Mechanics and Materials | Year: 2012

Mechanical properties and microstructures of Ti811 alloys under different heat treatment conditions were studied. The results show that the microstructures of Ti811 alloy consist of α, massive β and grain-boundary β after normal annealing. The intensity and hardness decreased, while the ductility increased. After double annealing, the primary phase α reduced and needle-like secondary α" was formed. The massive β and grain-boundary β changed into intergranular β gradually. The microstructure was relatively uniform. Then the intensity and hardness increased, the ductility decreased when compared to general annealing. The needle-like secondary α" and metastable β would break down into dispersed α and β after solution hardening and aging. The combination properties of alloys would be improved. According to fractography of titanium alloy, the fracture mechanism of the Ti811 alloy was dissociation - brittle intergranular fracture, which was a type of fracture between the intergranular fracture of brittle and cleavage fracture. © (2012) Trans Tech Publications.


Liu Y.,Henan University of Science and Technology | Liu Y.,Henan Key Laboratory of Advanced Non Ferrous Materials | Sun Y.-W.,Henan University of Science and Technology | Tian B.-H.,Henan University of Science and Technology | And 4 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2011

Using the Gleeble-1500D thermal simulator, the high-temperature plastic deformation behavior and processing map of 10%Mo/Cu-Al 2O 3 composite are investigated at 350~750°C with the strain rate of 0.01~5 s -1 and total strain of 0.7. The results show that the softening mechanism of dynamic recrystallization is a feature of high-temperature flow stress-strain curves of 10%Mo/Cu-Al 2O 3 composite, and the peak stress increases with the decreased deformation temperature or the increased strain rate. Meanwhile, the obtained processing map of dynamic material modeling is used to analyze the deformation mechanism and the destabilization mechanism of 10%Mo/Cu-Al 2O 3 composite, the optimal deformation processing parameters rangs of the deformation temperatures and the strain rates are 650~750°C and 0.01~0.1 s -1, respectively.


Wang J.-F.,Henan University of Science and Technology | Jia S.-G.,Henan University of Science and Technology | Jia S.-G.,Henan Key Laboratory of Advanced Non Ferrous Materials | Chen S.-H.,Chinalco Luoyang Copper Co LTD | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

Effects of aging temperature and aging time on microstructure and properties of a Cu-Ni-Si-Mg alloy which was produced by continuous casting and rolling process were investigated, and the aging kinetics of the alloy was analyzed. The results show that a better combination of properties is obtained for the alloy aged at 450°C for 2 h, the microhardness and electrical conductivity of the alloy are 242 HV and 35.53%IACS, respectively. Both phase transformation kinetics equation and electrical conductivity equation are derived in terms of the analyses of the electrical conductivity variations during aging, and the transformation kinetics and the electrical conductivity equation curves are obtained. The results obtained by the electrical conductivity equations are in good agreement with the experimental values.


Liu Y.,Henan University of Science and Technology | Liu Y.,Henan Key Laboratory of Advanced Non Ferrous Materials | Zhao R.-L.,Henan University of Science and Technology | Tian B.-H.,Henan University of Science and Technology | And 4 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2011

Using a Gleeble-1500 simulator, the dynamic recrystallization behavior during high-temperature plastic deformation and processing maps of W-50%Cu composite were investigated at 650-950°C with the strain rate of 0.01-5 s-1 and total strain of 0.7. The results show that the high-temperature flow stress-strain curves of W-50%Cu composite are characterized by softening mechanism of dynamic recovery and dynamic recrystallization, and the peak stress increases with decreasing deformation temperature or increasing strain rate. Based on the true stress-strain curves, the established constitutive equation represents the high-temperature flow behavior of W-50%Cu composite, and the calculated results of the flow stress are in good agreement with the high-temperature deformation experimental results. Meanwhile, the obtained processing map of dynamic materials modeling(DMM) is used to analyze the deformation mechanism and the destabilization mechanism of W-50%Cu composite, the optimal deformation processing parameters of the deformation temperatures rang and the strain rates rang are 650-700°C and 1-5 s-1 or 850-950°C and 0.01-0.1 s-1.

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