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Solidification Effect on the Microstructure and Mechanism of Laser‐Solid‐Forming‐Produced Flame‐Resistant Ti–35V–15Cr Alloy
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-05-14 , DOI: 10.1002/adem.202000102 Hua Tan 1 , Tengteng Hu 2 , Yongxia Wang 1 , Fengying Zhang 2 , Ying Qiu 2 , Tong Liu 2 , Wei Fan 1 , Lai-Chang Zhang 3
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2020-05-14 , DOI: 10.1002/adem.202000102 Hua Tan 1 , Tengteng Hu 2 , Yongxia Wang 1 , Fengying Zhang 2 , Ying Qiu 2 , Tong Liu 2 , Wei Fan 1 , Lai-Chang Zhang 3
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Ti–35V–15Cr alloy has become an indispensable material in aerospace industry due to its excellent flame‐resistance properties. Herein, the block and thin‐wall Ti–35V–15Cr samples are built by laser solid forming (LSF) under the same processing parameters, and the evolution of solidification microstructure is investigated. This work focused on the effect of molten pool solidification parameters and complex thermal cycling conditions on the morphology of β grains and the substructure in the grains. The microstructure of LSF‐produced Ti–35V–15Cr block sample mainly consists of epitaxial columnar dendritic grains, whereas that of the deposited thin‐wall sample is mainly composed of near‐equiaxed grains together with subgrains formed in the near‐equiaxed grains. Such different microstructure results from extremely sensitive thermal behavior condition in LSF process. The simulated thermal behavior characteristics using finite element method illustrate that the thermal cycles during block deposition are very complex and the temperature gradient at the last solidification in block deposition is much higher than that in the deposition of thin‐wall samples, resulting in significantly different solidification microstructure between thin‐wall and block samples.
中文翻译：
凝固对激光固溶Ti-35V-15Cr合金显微组织的影响
Ti–35V–15Cr合金具有出色的阻燃性能，已成为航空航天业必不可少的材料。在此，在相同的加工参数下通过激光固相成形（LSF）构建块状和薄壁Ti–35V–15Cr样品，并研究了凝固组织的演变。这项工作的重点是熔池凝固参数和复杂的热循环条件对β晶粒形态和晶粒亚结构的影响。由LSF生产的Ti–35V–15Cr块状样品的微观结构主要由外延柱状枝晶晶粒组成，而沉积的薄壁样品的显微组织主要由近等轴晶粒以及在近等轴晶粒中形成的亚晶粒组成。这种不同的微观结构是由LSF工艺中极其敏感的热行为条件引起的。使用有限元方法模拟的热行为特征表明，块沉积过程中的热循环非常复杂，并且在块沉积过程中最后一次凝固时的温度梯度比薄壁样品的沉积过程中的温度梯度高得多，从而导致了明显不同的凝固薄壁和块状样品之间的微观结构。
更新日期：2020-05-14
中文翻译：
凝固对激光固溶Ti-35V-15Cr合金显微组织的影响
Ti–35V–15Cr合金具有出色的阻燃性能，已成为航空航天业必不可少的材料。在此，在相同的加工参数下通过激光固相成形（LSF）构建块状和薄壁Ti–35V–15Cr样品，并研究了凝固组织的演变。这项工作的重点是熔池凝固参数和复杂的热循环条件对β晶粒形态和晶粒亚结构的影响。由LSF生产的Ti–35V–15Cr块状样品的微观结构主要由外延柱状枝晶晶粒组成，而沉积的薄壁样品的显微组织主要由近等轴晶粒以及在近等轴晶粒中形成的亚晶粒组成。这种不同的微观结构是由LSF工艺中极其敏感的热行为条件引起的。使用有限元方法模拟的热行为特征表明，块沉积过程中的热循环非常复杂，并且在块沉积过程中最后一次凝固时的温度梯度比薄壁样品的沉积过程中的温度梯度高得多，从而导致了明显不同的凝固薄壁和块状样品之间的微观结构。
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