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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。
During hot deformation of metal at high temperature, phase transformation often occurs in the deformation process, plastic deformation and phase change simultaneously. In the process, on the one hand, the occurrence of phase transformation consumes the energy of deformation storage. On the other hand, the occurrence of deformation will cause the accumulation of new energy and the generation of crystal defects, the energy state, the distribution of defects and the phase transformation process Different, the whole process is completely dynamic. Based on the thermal compression simulation experiment of a new type of near-α titanium alloy-TA15 titanium alloy, from the perspective of mesoscale, the modern plastic working theory, metallography, metallography, finite element method, crystal plastic theory, cellular automata theory, Programming languages and many other theories and methods, the phase transformation behavior of TA15 titanium alloy during hot compression deformation has been systematically studied, the phase transformation process of the alloy has been simulated and the evolution of the microstructure of the TA15 titanium alloy has been dynamically reproduced , Established the phase change kinetic equation under different deformation conditions. This has a very important theoretical and practical significance for the reasonable formulation of the thermal processing technological scheme in the deformation process and the promotion of the development and practical application of the titanium alloy.