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flow stress model FOR HARD MACHINING OF AISI H13 WORK TOOL STEEL

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Acta Metallurgica Sinica(English Letters) 2005年第6期18卷 741-748页

作者： H. Yan J. Hua R. Shivpuri School of Mechanical-Electrical Engineering Nanchang University Nanchang 330029China The Ohio State University Columbus OH 43210 USA

An approach is presented to characterize the stress response of workpiece in hard machining, accounted for the effect of the initial workpiece hardness, temperature, strain and strain rate on flow stress. AISI H13 work tool steel was chosen to verify this methodology. The proposed flow stress model demonstrates a good agreement with data collected from published experiments. Therefore, the proposed model can be used to predict the corresponding flow stress-strain response of AISI H13 work tool steel with variation of the initial workpiece hardness in hard machining.

关键词： flow stress model hard machining AISI H13 work tool steel

A new flow stress model based on Arrhenius equation to track hardening and softening behaviors of Ti6Al4V alloy

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Rare Metals 2018年第12期37卷 1035-1045页

作者： Fu-Hui Zhu Wei Xiong Xi-Feng Li Jun Chen Department of Plasticity Technology Shanghai Jiao Tong University

The conventional Arrhenius-type model was adopted to identify the deformation characteristic of Ti6 A14 V(TC4) titanium alloy based on the stress-strain curves of isothermal compression test. A new flow stress model based on Arrhenius equation was proposed for TC4,which is composed of peak flow stress(PFS) prediction and strain compensation. The predicted PFS is set as a reference to derive the flow stress model at any strain ranging from approximately 0 to 0.7. The predictability and efficiency among the proposed model, conventional model,and an existing physical-based model of TC4 were comparatively evaluated. It is found that the newly proposed model can simultaneously track the hardening and softening behaviors of TC4 through a single expression while the other existing models are only valid in the softening ***, the wider application range and acceptable accuracy of the new model have been achieved by fewer material constants with much-simplified modeling procedure than the other models.

关键词： flow stress model Arrhenius equation Hot deformation flow behavior Titanium alloy

Establishment and application of flow stress models of Mg-Y-MM-Zr alloy

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Transactions of Nonferrous Metals Society of China 2011年第4期21卷 857-862页

作者：马鸣龙李兴刚李永军何兰强张奎王献文陈丽芳北京有色金属研究总院有色金属材料制备加工国家重点实验室北京100088 西南铝业股份有限公司重庆401326

The hot working behaviors of Mg-9Y-1MM-0.6Zr （WE91） magnesium alloy were researched in a temperature range of 653 773 K and strain rate range of 0.001 1 s 1 on Gleeble 1500D hot simulator under the maximum deformation degree of 60%. A mathematical model was established to predict the stress—strain curves of this alloy during deformation. The experimental results show that the relationship between stress and strain is obviously affected by the strain rates and deformation temperatures. The flow stress of WE91 magnesium alloy during high temperature deformation can be represented by Zener-Hollomon parameter in the hyperbolic Arrhenius-type equation, and the stress—strain curves obtained by the established model are in good agreement with the experimental results,which prove that the model reflects the real deformation characteristics of the WE91 alloy. The average deformation activation energy is 220 kJ/mol at strain of 0.1. The microstructures of WE91 during deformation processing are influenced by temperature and strain rates.

关键词： rare-earth magnesium alloy Zener-Hollomon parameter flow stress model microstructure

New approach for modeling flow stress of aluminum alloy 6A10 considering temperature variation

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Transactions of Nonferrous Metals Society of China 2010年第8期20卷 1482-1487页

作者：李雪松伍来智陈军张鸿冰 National Die and Mold CAD Engineering Research Center Shanghai Jiao Tong University

The flow stress behavior of aluminum alloy 6A10 was studied by the hot compression tests at temperatures from 350℃ to 550 ℃ and strain rates from 0.1 s^-1 to 10 s^-1 with Gleeble-1500 thermo-mechanical simulator. The result demonstrates that the temperatures of specimen differ from initial ones affected by deformation conditions, and that the softening mechanism is dynamic recovery. A new approach was proposed to analyze the flow stress character directly from actual stress, strain, temperature and strain rate data, without performing any previous flow stress correction caused by temperature variation. Comparisons between the experimental and predicted results confirm that the established flow stress model can give reasonable estimation, indicating that the mentioned approach can be used in flow stress model analysis of the materials that undergo only dynamic recovery based on the data obtained under variable deformation temperature.

关键词： aluminum alloy 6A10 flow stress model dynamic recovery

Plastic flow behavior of superalloy GH696 during hot deformation

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Transactions of Nonferrous Metals Society of China 2016年第3期26卷 712-721页

作者：许赵华李淼泉李宏西北工业大学材料学院西安710072

In order to investigate the hot deformation behavior of superalloy GH696, isothermal compression experiments were carried out at deformation temperatures of 880?1120 °C and strain rates of 0.01?10 s?1. And the deformation amount of all the samples was 50%. The strain rate sensitivity exponent (m) and strain hardening exponent (n) under different deformation conditions were calculated, meanwhile the effects of the processing parameters on the values ofm andn were analyzed. The results show that the flow stress increases with the increase of strain rate and the decrease of deformation temperature. The value ofm increases with the increase of deformation temperature and decreases with the increase of strain rate, while the value ofn decreases with the increase of deformation temperature. A novel flow stress model during hot deformation of superalloy GH696 was also established. And the calculated flow stress of the alloy is in good agreement with the experimental one.

关键词： superalloy GH696 flow stress deformation behavior strain rate sensitivity exponent strain hardening exponent flow stress model