A. E. Chesnokov, V. O. Drozdov, K. A. Skorokhod, A. V. Smirnov, A. N. Cherepanov
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引用次数: 0
Abstract
This study examines how preliminary mechanical milling of a modifying TiN-based powder mixture affects the morphology of the CO2 laser-treated surface, the weld pool morphology, and the cross-sectional structure of the material. Ultrafine titanium nitride particles used as nanomodifier have low wettability by liquid metal, are not entrained by its convective flows, and tend to accumulate in the subsurface layer, which makes it difficult to effectively modify the structure within the treated material. Ball milling of the modifying Ti + TiN mixture for 9 min leads to the formation of composite particles (5–7 µm) with ultrafine TiN particles uniformly distributed over their surface and volume. When the composite particles are melted by the laser beam, they turn to ultrafine TiN particles of nanomodifier coated with a thin titanium layer, which have a smaller contact angle. As a result, the particles are more evenly distributed over the weld pool and the number of crystallization centers increases, leading to the formation of a fine homogeneous structure of the material. The microhardness increases by 32%, and its standard deviation decreases by a factor of 1.5–3.0.
摘要 本研究探讨了改性 TiN 基粉末混合物的初步机械研磨如何影响 CO2 激光处理表面的形态、焊接熔池形态以及材料的横截面结构。用作纳米改性剂的超细氮化钛颗粒对液态金属的润湿性较低，不会被液态金属的对流夹带，容易在次表层堆积，因此很难有效地改变处理材料内部的结构。将改性 Ti + TiN 混合物球磨 9 分钟，可形成复合颗粒（5-7 微米），其表面和体积上均匀分布着超细 TiN 颗粒。当复合颗粒被激光束熔化时，它们会变成纳米改性剂的超细 TiN 颗粒，表面涂有一层薄薄的钛层，接触角较小。因此，颗粒在焊接熔池中的分布更加均匀，结晶中心的数量增加，从而形成了材料的精细均匀结构。显微硬度增加了 32%，其标准偏差降低了 1.5-3.0 倍。
期刊介绍：
The journal provides an international medium for the publication of theoretical and experimental studies and reviews related in the physical mesomechanics and also solid-state physics, mechanics, materials science, geodynamics, non-destructive testing and in a large number of other fields where the physical mesomechanics may be used extensively. Papers dealing with the processing, characterization, structure and physical properties and computational aspects of the mesomechanics of heterogeneous media, fracture mesomechanics, physical mesomechanics of materials, mesomechanics applications for geodynamics and tectonics, mesomechanics of smart materials and materials for electronics, non-destructive testing are viewed as suitable for publication.
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