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采用Gleeble3500热模拟试验机对Ti-6Al-4V钛合金进行了焊接热模拟试验,模拟该合金自高温β相区以一定冷却速率冷却的过程。试样选用两端钻孔的标准焊接模拟试样,均温区约2 mm宽。采用金相显微镜、扫描电镜和X射线衍射分析研究了试样不同区域的显微组织与结构。热模拟区边缘区域为细小的片状α组织,中心均温区域为针状α′马氏体组织;XRD标定发现母材和热模拟区域的衍射峰分别与纯钛密排六方α和α′相偏移一个角度后重合;热模拟区域的显微硬度略高于母材。
The welding thermal simulation of Ti-6Al-4V titanium alloy was carried out by Gleeble3500 thermal simulation test machine to simulate the cooling process of the alloy from the high-temperature β-phase region with a certain cooling rate. The specimen is made of a standard welding specimen that is drilled at both ends. The average temperature is about 2 mm wide. The microstructure and structure of different regions of the sample were studied by metallographic microscope, scanning electron microscopy and X-ray diffraction. The edge of the thermal simulation zone is a small piece of α-shaped tissue, and the average temperature region in the center is acicular α ’martensite. The XRD results show that the diffraction peaks of the parent material and the thermal simulation region are close to the hexagonal α and α’ Phase offset by a point after the coincidence; thermal simulation of the micro-hardness slightly higher than the base metal.