TC4钛合金激光切割热影响区及性能研究

为了研究TC4钛合金民用大飞机蒙皮材料的激光切割工艺, 分别对0.8mm和1.6mm的TC4钛合金板材进行激光切割工艺试验, 研究了切割后板材热影响区的组织、深度, 试件的拉伸性能及断口形貌。结果表明: 切割速度是影响切割质量的主要因素; 热影响区分为熔化区和非熔化区, 组织与基体完全不同; 热影响区深度受切割工艺的影响较大, 板材下表面的热影响区深度均大于上表面; 热影响区的存在影响板材的拉伸性能, 且热影响区深度越深, 材料的拉伸性能越差; 有无热影响区的试样断口形貌均属于塑性断裂。

Abstract

In order to study the laser cutting technology of TC4 titanium alloy for civil aircraft skin materials, laser cutting technology experiments were carried out on 0.8 mm and 1.6 mm TC4 titanium alloy plates respectively. The microstructure, depth of the heat affected zone of the plate after cutting, tensile properties and fracture morphology of the specimens were studied. The results show that the cutting speed is the main factor affecting the cutting quality; the thermal effect is divided into melting zone and non melting zone, and the structure is completely different from the matrix; the depth of the thermal effect zone is greatly affected by the cutting process, and the depth of the thermal effect zone on the lower surface of the plate is greater than that on the upper surface; the existence of the thermal effect zone affects the tensile property of the plate, and the deeper the depth of the thermal effect zone is, the worse the tensile property of the material is; the fracture morphology of the sample with or without the thermal effect zone is plastic crack.

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