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通过异步/同步热轧实验研究了异步热轧工艺对钛合金显微组织和力学性能的影响。实验表征了试样的显微组织、力学性能、断口形貌和微观取向。结果表明,复杂应变路径较之简单应变路径能更好地细化晶粒,同时提高强度和塑性,并且表层晶粒小于中心晶粒。异步轧制工艺相比同步轧制能更好地获得细小晶粒。异步轧制试样的强度及塑性值高于同步轧制试样相应值,提高异步速比可提高强度及塑性值。异步轧制试样的塑性变形机制可能是滑移,而同步轧制试样塑性变形机制为滑移或孪晶。
The effects of asynchronous hot rolling process on the microstructure and mechanical properties of titanium alloy were studied by asynchronous / synchronous hot rolling experiments. The microstructure, mechanical properties, fracture morphology and microscopic orientation of the samples were characterized experimentally. The results show that the complex strain path can refine the grain better than the simple strain path, improve the strength and ductility at the same time, and the surface grain size is smaller than the central grain size. Asynchronous rolling process compared to synchronous rolling can get better fine grains. The strength and plasticity of the as-rolled samples are higher than the corresponding values of the sample of the synchronous rolling. Increasing the asynchronous speed ratio can improve the strength and plasticity. The plastic deformation mechanism of asynchrony rolling sample may be slip, while the plastic deformation mechanism of synchronous rolling sample is slip or twins.