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Microstructure evolution of the transitional region in isothermal local loading of TA15 titanium alloy

机译：TA15钛合金等温局部加载过渡区的组织演变。

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摘要

The microstructure of the transitional region determines the performance of TA15 component under isothermal local loading forming. To understand the characteristic of microstructure evolution in transitional region, a set of analogue experiments for isothermal local loading were designed and carried out to investigate the microstructure development under different temperatures and complex strain path. It is found that the isothermal local loading does not change the microstructural composition of TA15 alloy with initially equiaxed microstructure in the transitional region, though a small fraction of lamellar a phases appear at temperatures above 950 C due to reheating and small deformation in the second loading step. Recrystallization takes place in the |S matrix but not in the primary equiaxed a phases. The (3 grains are fine and equiaxed irrespective of strain path due to recrystallization. The existence of lamellar a refines the fi grains. Kinked and disordered primary equiaxed a phases are produced under complex strain path. The grain size of primary equiaxed a phases increases slightly due to static coarsening and strain induced grain growth in multi-heat processing. The volume fraction of primary equiaxed a phases is not influenced by strain path but determined by working temperature.
机译：过渡区的微观结构决定了TA15组分在等温局部载荷作用下的性能。为了解过渡区显微组织的演变特征，设计并进行了一系列等温局部加载的模拟实验，以研究不同温度和复杂应变路径下的显微组织发展。发现在过渡区域，等温局部载荷不会改变具有初始等轴组织的TA15合金的组织结构，尽管在第二次载荷中，由于二次加热和小变形，在高于950°C的温度下会出现一小部分层状a相。步。重结晶在| S矩阵中发生，但不在一次等轴a相中发生。 （3个晶粒是细小且等轴的，而不考虑由于重结晶而产生的应变路径。层状a的存在使细晶晶粒细化。在复杂应变路径下产生了扭曲且无序的初等轴a相。初等轴a相的晶粒尺寸略有增加由于多热处理过程中由于静态粗化和应变诱发晶粒长大，初等轴晶a相的体积分数不受应变路径的影响，而是由工作温度决定的。

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  • 来源
    《Materials Science and Engineering》 |2011年第6期|p.2694-2703|共10页
  • 作者

    X.G. Fan; P.R Gao; H. Yang;

  • 作者单位

    State Key Laboratory of Solidification Processing, School of Materials Science and Engineering. Northwestern Polytechnical University, P.O. Box 542, Xi'an 710072, PR China;

    State Key Laboratory of Solidification Processing, School of Materials Science and Engineering. Northwestern Polytechnical University, P.O. Box 542, Xi'an 710072, PR China;

    State Key Laboratory of Solidification Processing, School of Materials Science and Engineering. Northwestern Polytechnical University, P.O. Box 542, Xi'an 710072, PR China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    local loading; TA15 titanium alloy; transitional region; microstructure evolution;

    机译：本地加载;TA15钛合金;过渡地区微观结构演变;

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