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首页> 外文期刊>Materials Science and Engineering >Constitutive model and optimal processing parameters of TC17 alloy with a transformed microstructure via kinetic analysis and processing maps
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Constitutive model and optimal processing parameters of TC17 alloy with a transformed microstructure via kinetic analysis and processing maps

机译：通过动力学分析和工艺图对具有转变后的组织的TC17合金的本构模型和最佳工艺参数

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摘要

The kinetic and flow stability analysis of TC17 alloy with a transformed microstructure in the hot deformation of α+β region were carried out. The flow behavior in the hot deformation of TC17 alloy was sensitive to the strain, strain rate and deformation temperature. The work hardening effect dominated the flow in the early stage of deformation, and the globularization, dynamic recrystallization (DRX) occurred in the following deformation, in which the apparent activation energy for deformation decreased with the increasing of strain. A strain compensated constitutive model for hot deformation of TC17 alloy was established. The peak efficiency of power dissipation at the strains of 0.3 and 0.5 occurred at 0.01 s~(-1) and 1143 K due to α to β transformation and DRX of β phase. However, the peak efficiency of power dissipation at a strain of 0.7 occurred at 0.1 s~(-1) and 1123 K due to the globularization of α lamellae and DRX of β phase. The flow instability analysis suggested that the safe processing window should not exceed 0.32 s~(-1). The processing maps of TC17 alloy at different strains were constructed. According to the processing maps and microstructure observation, the optimal processing parameters for globularization of TC17 alloy with a transformed microstructure were at the temperatures ranging from 1043 K to 1123 K and strain rates ranging from 0.01 s~(-1) to 0.1 s~(-1).
机译：对在α+β区热变形下组织转变的TC17合金进行了动力学和流动稳定性分析。 TC17合金热变形时的流动行为对应变，应变速率和变形温度敏感。加工初期，工作硬化效应占主导地位，随后的变形过程中发生了球化，动态再结晶（DRX），其表观活化能随应变的增加而减小。建立了TC17合金热变形的应变补偿本构模型。由于α到β的转变和β相的DRX，在0.3和0.5应变下的功率消耗峰值效率出现在0.01 s〜（-1）和1143K。然而，由于α薄片的球状化和β相的DRX，在0.7应变下，功率耗散的峰值效率出现在0.1 s〜（-1）和1123K。流动不稳定性分析表明，安全处理窗口不应超过0.32 s〜（-1）。绘制了不同应变下TC17合金的加工图。根据工艺图和显微组织观察，组织转变的TC17合金球化的最佳工艺参数为1043 K〜1123 K，应变速率为0.01 s〜（-1）〜0.1 s〜（ -1）。

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