Flow characteristics and intrinsic workability of IN718 superalloy
Flow characteristics and intrinsic workability of IN718 superalloy
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IN718高温合金的流动特性和固有加工性
DOI：
10.1016/j.msea.2015.06.093
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发表时间：
2015-08-26
期刊：
影响因子：
6.4
通讯作者：
Long, Hui
中科院分区：
文献类型：
--
作者：
Chen, Fei;Liu, Juan;Long, Hui
研究了IN718高温合金的变形特征，建立了新的流动应力模型，并结合光学显微组织观察生成了三维加工图，对其本征加工性能进行了详细的评价。在Gleeble-1500热模拟试验的基础上，建立了IN718高温合金的流动应力模型，整个变形过程的流动应力仅用一个峰值应力来描述，该峰值应力仅与Zener-Hollomon参数和应变有关。所开发的模型显示了动态再结晶(DRX)引起的应变软化。通过构建3D加工图，进一步研究了其内在的可操作性。三维加工图描述了功率耗散效率和流动不稳定域随应变率、温度和应变的变化，由此可以确定IN718热机械加工的最佳变形条件。(C)2015年提交人。爱思唯尔出版公司(Elsevier B.V.)
This study focuses on deformation characteristics of superalloy IN718 by formulation of a new flow stress model and detailed evaluation of intrinsic workability through the generation of three-dimensional (3D) processing maps with the support of optical microstructural observations. Based on thermomechanical simulation tests using a Gleeble-1500 machine, the flow stress model for superalloy IN718 was built and the flow stress throughout the entire deformation process was described by a peak stress only depending on Zener-Hollomon parameter and strain. The developed model exhibited the strain softening due to dynamic recrystallisation (DRX). The intrinsic workability was further investigated by constructing 3D processing maps. The 3D processing maps described the variations of the efficiency of power dissipation and flow instability domains as a function of strain rate, temperature and strain, from which the favourite deformation conditions for thermomechanical processing of IN718 can be established. (C) 2015 The Authors. Published by Elsevier B.V.