The Experts below are selected from a list of 33852 Experts worldwide ranked by ideXlab platform
Feng Bin - One of the best experts on this subject based on the ideXlab platform.
-
Strain-rate and Temperature Sensitivity Coefficient for TC11 Titanium Alloy
Transactions of Shenyang Ligong University, 2009Co-Authors: Feng BinAbstract:The law of flow stress-strain of TC11 titanium alloy at high temperature is studied using thermal simulation experiment.The experimental temperature is between 850℃ and 930℃,strain-rate is between 0.001 and 1.0 and the Deformation Degree is 50%.On the basis of analysis of the influence of temperature and strain-rate and Deformation Degree on flow stress,strain-rate sensitivity coefficient and temperature sensitivity coefficient for TC11 titanium alloy are put forward,respectively,m=0.168 8,s=10 233,which will make contribution to the numerical simulation for deforming of titanium alloy at high temperature.
-
Mechanical Behavior of TC11 Titanium Alloy during Deformation at High Temperature
Transactions of Shenyang Ligong University, 2006Co-Authors: Feng BinAbstract:The flow stress evolution of TC11 titanium alloy during Deformation at high temperature is studied in the temperature range of 760℃~960℃,strain rate range of 0.001~5.0s~(-1) and Deformation Degree of 50% on Gleebleo 1500 thermo-mechanical simulator.Based on the analysis of effect of Deformation temperature,Deformation Degree and strain rate on the flow stress,the constitutive relational model of TC11 titanium alloy is obtained by regression of experimental data according to the Arrhenius equation.Thus,an important computational model for numerical simulation of TC11 titanium alloy during Deformation at high temperature is provided.
Jian Wang - One of the best experts on this subject based on the ideXlab platform.
-
Stress-induced α″ phase in a beta Ti–19Nb–1.5Mo–4Zr–8Sn alloy
Materials Characterization, 2018Co-Authors: Yacen Zhang, Jian Wang, Huiqun Liu, Bin Wang, Yong Jiang, Yu Xiao, Qi Yang, Qi GaoAbstract:Abstract The morphological evolution of the stress-induced α″ martensite with increases in the stretching and rolling Deformation Degrees as well as the related orientation relationship were investigated in a β titanium alloy (Ti–19Nb–1.5Mo–4Zr–8Sn)·For a stretching Deformation of 1%, the α″ martensite exhibited a packet morphology consisting of parallel lamellar structures. On the other hand, in the 2%-rolled sample, the α″ martensite exhibited a long lath-like distribution, which was accompanied by a few small pieces. With an increase in the Deformation Degree, the α″ martensite gradually exhibited a ladder-like structure consisting of long and short α″ laths or ellipsoids. The existence of these self-accommodating martensitic variants decreased the elastic energy. The parallel α″ laths present within a single packet were found to have the same orientation. The interface between the α″ and β phases was coherent, and their lattice constant relationships were identified as 2 a β ≈ b α ″ ≈ c α ″ and aβ ≈ aα″. Further, with the increase in the Deformation Degree, the hardness of the alloy first decreased and then increased; this was the case both the stretched as well as the rolled samples.
-
Pathological Speech Deformation Degree Assessment Based on Dynamic and Static Feature Integration
2008 2nd International Conference on Bioinformatics and Biomedical Engineering, 2008Co-Authors: Zhiyan Han, Xu Wang, Jian WangAbstract:It is often more important to provide the respective person(e.g. physician) with guidelines for a Deformation Degree assessment of speech signal than to achieve a very accurate automated recognition. By ear it is easy to judge whether the speech is regular or deformed, but any attempt of a Deformation Degree evaluation is not satisfactory. According to above status, we presented a Deformation Degree assessment system of speech signal based on dynamic and static feature integration. The system is comprised of four main sections, a pre-processing section, a feature extracting section, a neural network processing section and assessment value calculation section. The assessment rank have five: profound, severe, moderate severe, moderate and mild.And also this paper integrates different speech features to calculate the perceptual distance vector to improve assessment ratio, the perceptual distance between the pathological speech and the normal speech under test is used as input to the neural network The simulation results demonstrate that a classification accuracy of 97% is obtained with database of 100 speech signals(50 normal and 50 pathological cases). Thus the performance of the system has been improved by integrating the dynamic and static features.
Yanan Zhao - One of the best experts on this subject based on the ideXlab platform.
-
Microstructural evolution of plastic Deformation of NiTi shape memory alloy at low temperature
Journal of Wuhan University of Technology-Mater. Sci. Ed., 2013Co-Authors: Yanqiu Zhang, Shuyong Jiang, Yanan Zhao, Ming TangAbstract:Nickel-titanium shape memory alloy (NiTi SMA) which possesses crystal structure of B2 austenite at room temperature was subjected to plastic Deformation at low temperature (−150 °C) by means of local canning compression. The microstructural evolution of NiTi SMA at the different Deformation Degree was investigated by transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM). At the Deformation Degree by 15%, a high density of dislocations occurs in the deformed NiTi sample. At the Deformation Degree by 25%, the deformed NiTi sample exhibits the martensite morphology due to the pinning of dislocations at the grain boundaries. At the Deformation Degree by 50%, a small amount of nanocrystalline phase arises in the deformed NiTi sample. At the Deformation Degree by 80%, severe plastic Deformation (SPD) leads to the occurrence of a great deal of amorphous and nanocrystalline phase.
-
dynamic recovery and dynamic recrystallization of niti shape memory alloy under hot compression Deformation
Transactions of Nonferrous Metals Society of China, 2013Co-Authors: Shuyong Jiang, Yanqiu Zhang, Yanan ZhaoAbstract:Abstract Mechanical behavior of nickel–titanium shape memory alloy (NiTi SMA) under hot Deformation was investigated according to the true stress—strain curves of NiTi samples under compression at the strain rates of 0.001–1 s −1 and at the temperatures of 600–1000 °C. Dynamic recovery and dynamic recrystallization of NiTi SMA were systematically investigated by microstructural evolution. The influence of the strain rates, the Deformation temperatures and the Deformation Degree on the dynamic recovery and dynamic recrystallization of NiTi SMA was obtained as well. NiTi SMA was characterized by the combination of dynamic recovery and dynamic recrystallization at 600 °C and 700 °C, but the complete dynamic recrystallization occurred at other Deformation temperatures. Increasing the Deformation temperatures or decreasing the stain rates leads to larger equiaxed grains. The Deformation Degree has an important influence on the dynamic recrystallization of NiTi SMA. There exists the critical Deformation Degree during the dynamic recrystallization of NiTi SMA, beyond which the larger Deformation Degree contributes to obtaining the finer equiaxed grains.
Xie Jianxin - One of the best experts on this subject based on the ideXlab platform.
-
effects of room temperature Deformation on mechanical properties microstructure and texture of continuous columnar grained bfe10 1 1 cupronickel alloy tubes
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2013Co-Authors: Gan Chunlei, Liu Xuefeng, Huang Haiyou, Xie JianxinAbstract:Abstract The effects of room-temperature Deformation on mechanical properties, the microstructure and texture evolution of continuous columnar-grained BFe10-1-1 cupronickel alloy tubes during room-temperature rolling and drawing were investigated. The results showed that continuous columnar grains were gradually thinned down into fiber microstructure, and the Degree of working-hardening of the BFe10-1-1 alloy was increased continually with the increase of room-temperature reduction during rolling and drawing. After the rolling Deformation Degree of 82.8%, the ultimate tensile strength (UTS) of the BFe10-1-1 cupronickel alloy tubes increased to 418.7 MPa from 212.0 MPa of the as-cast state, and the elongation (El) of 8.5% was still obtained. The as-rolled BFe10-1-1 cupronickel alloy tubes were further drawn to the Deformation Degree of 99.0%, and the ultimate tensile strength (UTS) increased to 603.7 MPa and the elongation (El) reduced to 2.2%. The excellent room-temperature extensibility of the continuous columnar-grained BFe10-1-1 cupronickel alloy tubes is significantly beneficial from the relative high volume fraction of the texture as well as low angle boundary.
R.j. Gu - One of the best experts on this subject based on the ideXlab platform.
-
Investigation of Deformation Degree and initial forming temperature dependences of microstructure in hot ring rolling of TA15 titanium alloy by multi-scale simulations
Computational Materials Science, 2012Co-Authors: He Yang, R.j. GuAbstract:Abstract Hot ring rolling is a preferred technology for manufacturing high-quality titanium alloy rings. During the process, the material undergoes complex microstructure evolution which determines the mechanical properties of the rolled ring. In this study, an internal state variable microstructure model for the hot working of TA15 titanium alloy is implemented into the 3D-FE model of hot ring rolling process under ABAQUS environment to realize multi-scale simulation of the process. Then the effects of Deformation Degree and initial forming temperature on the microstructure of TA15 titanium alloy in hot ring rolling are investigated numerically. The results show that: (1) with increasing Deformation Degree, the volume fraction and grain size of primary α phase in the ring both decrease, and the primary α phase distribution becomes more nonuniform while the primary α grain size distribution becomes more uniform; (2) with increasing initial forming temperature, the volume fraction and grain size of primary α phase both decrease, and the uniformity of primary α phase distribution gets better first and then worse while the uniformity of primary α grain size distribution gets better; and (3) in order to obtain uniform distributions of both primary α phase and grain size, an optimum process condition for hot ring rolling of TA15 titanium alloy is suggested to be the Deformation Degree of 0.25–0.35 and the initial forming temperature of 930–940 °C. The results can serve as a guide to the microstructure control, blank size design and processing parameter optimization for hot ring rolling of titanium alloy.