Fe元素对激光沉积制造高强钛合金组织及性能影响

以含有Fe元素和不含Fe元素的两种钛合金粉末为原料, 采用激光沉积制造技术制备高强钛合金样块, 并对其进行固溶+时效处理, 通过光学显微镜、扫描电子显微镜、显微硬度仪、X射线衍射及室温拉伸等手段, 研究了Fe元素的加入对高强钛合金组织和拉伸性能的影响。结果表明: 含有Fe元素的钛合金试件的抗拉强度和屈服强度都优于不含Fe的钛合金, 但塑性比较差。其中主要的原因是Fe元素的固溶强化作用, 促进了β相的生成, 保留更多β相到室温, 获得更加细小的β转变组织, 起到了细晶强化作用, 使抗拉强度和屈服强度均得到了增强。两种钛合金的断裂方式均为半韧性半解理断裂, 两种钛合金的断口表面较平整, 有延性区域和解理面的特征, 有Fe元素的钛合金因二次裂纹的存在使钛合金的塑性降低, 无Fe元素的钛合金因高密度的韧窝分布使钛合金的塑性得到了提高。

Abstract

The high-strength titanium alloy sample was fabricated by laser deposition manufacturing technology using two kinds of titanium alloy powders containing Fe and no Fe as raw materials, and it was subjected to solution and aging treatment. The effect of the addition of Fe on the microstructure and tensile properties of the high strength titanium alloy were researched by optical microscope, scanning electron microscope, microhardness tester, X-ray diffraction and tensile tests. The results show that the tensile strength and yield strength of titanium alloy containing Fe are better than that of titanium alloy without Fe, but the plasticity is worse. The main reason is the solid solution strengthening effect of Fe element, which promotes the formation of β phase, retains more β phase to room temperature, obtains finer β transformation structure, and plays a role of fine grain strengthening to make tensile strength and yield strength have been enhanced. The fracture modes of the two kinds of titanium alloys are semi-ductile and semi-cleavage fracture, the fracture surface of the two kinds of titanium alloy is flat, characterized by ductile areas and fracture surfaces. The plasticity of titanium alloy with Fe element is reduced by the existence of secondary crack, The plasticity of titanium alloys without Fe element was improved by high density dimple distribution.

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杨光, 于博戎, 王超, 王明海, 苏亚东, 王向明. Fe元素对激光沉积制造高强钛合金组织及性能影响[J]. 应用激光, 2020, 40(3): 393. Yang Guang, Yu Borong, Wang Chao, Wang Minghai, Su Yadong, Wang Xiangming. Effect of Fe Element on Microstructure and Properties of High Strength Titanium Alloy by Laser Deposition Manufacturing[J]. APPLIED LASER, 2020, 40(3): 393.

Fe元素对激光沉积制造高强钛合金组织及性能影响

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