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首页> 外文期刊>Materials Science and Engineering >High-cycle fatigue properties of an easily hot-workable (α + β)-type titanium alloy butt joint prepared by friction stir welding below β transus temperature
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High-cycle fatigue properties of an easily hot-workable (α + β)-type titanium alloy butt joint prepared by friction stir welding below β transus temperature

机译：在低于β转变温度的条件下通过搅拌摩擦焊制备的易于热加工的（α+β）型钛合金对接接头的高周疲劳性能

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摘要

Friction stir welding (FSW) was applied to a butt joint between the 2-mm-thick plates of an (alpha +beta)-type titanium alloy with high hot workability, Ti-4.5Al-2.5Cr-1.2Fe-0.1C alloy (Ti531C), to obtain defect-free welds. Refined equiaxed grains (equiaxed structure) were obtained and anisotropic mechanical properties of the parent material disappeared by grain subdivision of the alpha phase during FSW. However, grain diameter and crystal texture of the equiaxed structure remained unchanged during annealing. The tensile strengths of the welded joints with and without annealing were comparable to that of the Ti531C parent plate. However, the elongations of the welded joints were lower than that of the Ti531C parent plate because the stir zones are harder than the base metal, which results in deformation preferentially in the base metal region of the specimens. Tensile testing caused a failure in the base metal region in all welded joints. Annealing improved the high-cycle fatigue strength of the welded joints greatly. However, the high-cycle fatigue strength of the welded joints subjected to annealing was still slightly lower than that of the Ti531C parent plate. Fatigue failure point was in the stir zone or at the boundary between the stir zone and the base metal, which are different from the tensile test. These results imply that failure factors are different between tensile and fatigue tests. The small portion of the isothermal omega phase in the beta phase in the stir zone and discontinuous microstructure at the boundary between the stir zone and the base metal were potential stress concentration sites, inducing high-cycle fatigue failure.
机译：摩擦搅拌焊接（FSW）应用于高热加工性的α-β型钛合金，Ti-4.5Al-2.5Cr-1.2Fe-0.1C合金的2mm厚板之间的对接（Ti531C），以获得无缺陷的焊缝。获得细化的等轴晶粒（等轴结构），并且在FSW期间，通过α相的晶粒细分，母体材料的各向异性力学性能消失了。但是，等轴结构的晶粒直径和晶体织构在退火过程中保持不变。有和没有退火的焊接接头的抗拉强度与Ti531C母板的抗拉强度相当。但是，由于搅拌区比母材硬，焊接接头的伸长率低于Ti531C母板的伸长率，这优先导致试样的母材区域变形。拉伸测试导致所有焊接接头的母材区域失效。退火大大提高了焊接接头的高周疲劳强度。但是，退火后的焊接接头的高周疲劳强度仍比Ti531C母板低。疲劳破坏点在搅拌区或搅拌区与母材之间的边界，这与拉伸试验不同。这些结果表明，拉伸试验和疲劳试验的破坏因素不同。搅拌区β相中的等温ω相的一小部分以及搅拌区与贱金属之间的边界处的不连续微观结构是潜在的应力集中点，从而导致高周疲劳失效。

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