Microstructural characteristics and mechanical properties of Ti-6Al-4V friction stir welds
Microstructural characteristics and mechanical properties of Ti-6Al-4V friction stir welds
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DOI：
10.1016/j.msea.2007.08.051
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发表时间：
2008-06
期刊：
影响因子：
6.4
通讯作者：
Yu Zhang;Y. Sato;H. Kokawa;Seung Hwan C. Park;S. Hirano
中科院分区：
文献类型：
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作者：
Yu Zhang;Y. Sato;H. Kokawa;Seung Hwan C. Park;S. Hirano
对3 mm厚Ti-6Al-4V钛合金板在不同转速下进行搅拌摩擦焊。在400和500 rpm的转速下成功地产生了无缺陷的焊缝。基体材料（BM）具有变形的α/β层状组织。搅拌摩擦焊接产生了完整的片层组织，在SZ中具有细化的原始β晶粒，而HAZ包含由原始β组织中的等轴初生α和α/β片层组织组成的双峰组织。旋转速度的增加增加了α集落和先前的β晶粒的尺寸。SZ的硬度高于BM，HAZ的硬度最低。横向拉伸试验结果表明，所有焊缝断裂的热影响区，他们表现出较低的强度和伸长率比BM。仅SZ的拉伸试验表明其特征在于比BM具有更高的强度和伸长率。
Friction stir welding (FSW) was applied to 3mm-thick Ti–6Al–4V plates under different rotational speeds. Defect-free welds were successfully produced at rotational speeds of 400 and 500rpm. The base material (BM) had a deformed α/β lamellar microstructure. FSW produced a full lamellar structure with refined prior β grains in the SZ, while the HAZ contained a bimodal microstructure consisting of the equiaxed primary α and α/β lamellar structure within the prior β structure. An increase in rotational speed increased the sizes of α colonies and prior β grains. The SZ exhibited higher hardness than the BM, with the lowest hardness found in the HAZ. Results of the transverse tensile test showed that all welds fractured in the HAZ and that they exhibited lower strength and elongation than the BM. The tensile test for only the SZ showed it to be characterized by higher strength and elongation than the BM.