Advances in Constitutive Models of Metals and Alloys During Hot Deformation
LIU Shaofei1, QU Yinhu2, WANG Chonglou1, WANG Yanlong2, CHENG Xiaole2, WANG Ke3
1 Engineering Training Center, Xi’an Polytechnic University, Xi’an 710048; 2 Materials Science and Engineering College,Xi’an Polytechnic University, Xi’an 710048; 3 College of Materials Science and Engineering, Chongqing University, Chongqing 400030
Abstract: Constitutive model is an important way to predict the hot deformation behavior of metals and alloys, which plays a significant role in selecting suitable deformation parameters and preventing defects for various metals and alloys. In the recent investigations of hot deformation behavior of metals and alloys, the original data for constitutive model is generally obtained by various kinds of hot deformation tests under different parameters, and then obtained constitutive model is imported to the corresponding part of simulation software like Deform and Ansys to predict the distribution law of strain, strain rate and temperature of materials during forging process, and further optimize the actual processing parameters, avoid defects, and reduce the waste of materials and resource. Considering the importance of constitutive models in optimizing the working parameters and preventing the defects, tremendous strudies on construction and selection of constitutive models were conducted. The research focuses of constitutive model of metals and alloys in hot deformation can be concluded in the following aspects: the test method to obtain the original data for constitutive model construction, the mathematical or physical method for establishing the constitutive model, the selection of constitutive models for specified object, the advantage and disadvantage of various models and their revision. In past years, the original data for constitutive model are usually acquired by hot compression, hot extension, hot torsion and Split Hopkinson Pressure Bar tests under different hot deformation parameters. The common constitutive models can be generally classified as phenomenological method, physical-based method and the ones using artificial neural network. Each kind of model has its unique applicability, advantages and disadvantages. The disadvantages finally lead to the apparent fitting deviation of several deformation parameters. Aiming at reducing the deviation, scholars over the world have been devoted to revise and improve the models. Apart to the intrinsic reasons of the models, the lack of consideration of the grand factors like friction and deformation heat would also lead to the deviation. Presently, the common phenomenological constitutive models include Arrhenius model, Johnson-Cook model and so forth, the physical-based model includes Zerilli-Armstrong model, while the artificial neural network model is always conducted by three layers. These models have various advantages and disadvantages in dealing with data or physical meaning. This article summarizes the researches and developing direction of constitutive models from the aspects of the experimental methods to achieve the original data, the kinds and revision, and applications of the constitutive models. Also, the advantages and disadvantages of the typical constitutive models are discussed. The apparent deviation phenomenon of predicted and experimental data under several deformation parameters and the modified methods are pointed out. Finally, the future investigation direction of constitutive models of metals and alloys during hot deformation is predicted.
刘少飞, 屈银虎, 王崇楼, 王彦龙, 成小乐, 王柯. 金属和合金高温变形过程本构模型的研究进展[J]. 《材料导报》期刊社, 2018, 32(13): 2241-2251.
LIU Shaofei, QU Yinhu, WANG Chonglou, WANG Yanlong, CHENG Xiaole, WANG Ke. Advances in Constitutive Models of Metals and Alloys During Hot Deformation. Materials Reports, 2018, 32(13): 2241-2251.
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2018, Vol. 32 
