Gavalec Matúš, Barenyi Igor, Krbata Michal, Kohutiar Marcel, Balos Sebastian, Pecanac Milan
Faculty of Special Technology, Alexander Dubček University of Trenčín, 911 50 Trenčín, Slovakia.
Faculty of Technical Sciences, University of Novi Sad, 21000 Novi Sad, Serbia.
Materials (Basel). 2023 Sep 29;16(19):6492. doi: 10.3390/ma16196492.
The main task that the article introduces is the experimental study of how the geometry of contact surfaces affects the quality and mechanical properties of a rotary friction weld (RFW), as well as the findings of whether the RFW technology is suitable for the titanium alloy Ti6Al4V. The experiments were carried out for specimens with a diameter of 10 mm and were performed at 900 RPM. Three types of geometry were proposed for the RFW process: flat on flat, flat on 37.5° and flat on 45°. Based on these results, the best tested flat geometry was selected from the perspective of quality and economic efficiency. The welded joints were subjected to microstructural analysis, tensile testing, microhardness testing, and fractography, as well as spectral analysis of the fracture surface and EDS map analysis of oxygen. The flat geometry of the contact surface resulted in the least saturation with interstitial elements from the atmosphere. Fracturing in the RFW zone led to a brittle fracture with a certain proportion of plastic deformation. A pure ductile fracture occurred in specimens fractured in the HAZ region, where the difference in UTS values compared to specimens fractured by a brittle fracture mechanism was not significant. The average UTS value was 478 MPa.
本文介绍的主要任务是对接触面几何形状如何影响旋转摩擦焊接（RFW）的质量和力学性能进行实验研究，以及关于RFW技术是否适用于钛合金Ti6Al4V的研究结果。实验针对直径为10毫米的试样进行，转速为900转/分钟。为RFW工艺提出了三种几何形状类型：平面与平面、平面与37.5°面以及平面与45°面。基于这些结果，从质量和经济效益的角度选择了测试效果最佳的平面几何形状。对焊接接头进行了微观结构分析、拉伸试验、显微硬度测试、断口分析，以及断口表面的光谱分析和氧的能谱图分析。接触面的平面几何形状导致大气中间隙元素的饱和度最低。RFW区域的断裂导致了具有一定比例塑性变形的脆性断裂。在热影响区（HAZ）断裂的试样中发生了纯韧性断裂，与通过脆性断裂机制断裂的试样相比，其抗拉强度（UTS）值的差异不显著。平均UTS值为478兆帕。
