TA15钛合金热变形过程中基于介观尺度的相变模拟研究

发布时间：2018-12-05 22:32

【摘要】：金属在高温热形变过程中,相变常常发生在形变过程中,塑性形变和相变同步进行。在此过程中,一方面相变的发生消耗了形变储存能,另一方面形变的发生又会造成新能量的积累和晶体缺陷的产生,能量状态、缺陷分布等和先形变后相变过程的不同,整个过程完全是动态的。围绕新型近α型钛合金—TA15钛合金的热压缩模拟试验,从介观角度出发,综合运用现代塑性加工学、金属学、金相学、有限元方法、晶体塑性理论、元胞自动机理论、计算机编程语言等多种理论和方法,对TA15钛合金在热压缩变形过程中发生的相变行为进行了系统研究,模拟了合金的相变过程,动态再现了相变发生时的微观组织的演变情况,建立了不同变形条件下的相变动力学方程。这对于合理制定变形过程中的热加工工艺方案,对钛合金的发展和实际应用的促进都具有极为重要的理论价值和实际意义。
[Abstract]:In the process of high temperature thermal deformation, the transformation often occurs in the process of deformation, and the plastic deformation and the phase transition take place simultaneously. In this process, on the one hand, the occurrence of phase transition consumes the storage energy of deformation, on the other hand, the occurrence of deformation will lead to the accumulation of new energy and the generation of crystal defects, energy state, defect distribution, etc. The whole process is completely dynamic. Focusing on the thermal compression simulation test of a new type of near 伪 type titanium alloy, TA15 titanium alloy, from the point of view of mesoscopic, the application of modern plastic processing, metallography, finite element method, crystal plasticity theory, cellular automata theory, metallography, finite element method, and cellular automata theory are comprehensively applied. In this paper, the phase transformation behavior of TA15 titanium alloy during hot compression deformation is systematically studied by computer programming language, and the transformation process of the alloy is simulated, and the evolution of microstructure during phase transformation is dynamically reproduced. The kinetic equations of phase transformation under different deformation conditions are established. It is of great theoretical value and practical significance for the development and practical application of titanium alloy, and it is of great theoretical value and practical significance for the rational formulation of the hot working process in the deformation process and the promotion of the development and practical application of titanium alloy.
【作者单位】：合肥工业大学材料科学与工程学院;
【基金】：国家自然科学基金项目(51175137|E050802) 安徽省自然科学基金项目(1308085JGD02)资助
【分类号】：TG146.23

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