Superplastic deformation behavior of lamellar microstructure in a hydrogenated friction stir welded Ti-6Al-4V joint
Superplastic deformation behavior of lamellar microstructure in a hydrogenated friction stir welded Ti-6Al-4V joint
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氢化搅拌摩擦焊 Ti-6Al-4V 接头层状显微组织的超塑性变形行为
DOI：
10.1016/j.jallcom.2019.02.182
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发表时间：
2019-05
影响因子：
6.2
通讯作者：
Zeng Y. S.
中科院分区：
文献类型：
--
作者：
Wu L. H.;Jia C. L.;Han S. C.;Li N.;Ni D. R.;Xiao B. L.;Ma Z. Y.;Fu M. J.;Wang Y. Q.;Zeng Y. S.
钛合金焊缝超塑性低，流动应力大，超塑成形困难。在这项研究中，Ti-6Al-4V合金氢化后，与0.2wt%的氢进行搅拌摩擦焊（FSW）。研究了搅拌摩擦焊接头的超塑性行为。在825 °C和3 × 10−3s−1条件下，具有细层状微观结构的搅拌区表现出660%的最大伸长率。此外，在825 °C，3 × 10−4−1 × 10−3s−1条件下，搅拌区表现出接近母材600%的超塑性。这是首次对钛合金搅拌摩擦焊接头加氢超塑性的研究。与未加氢的Ti-6Al-4V合金搅拌摩擦焊接头相比，加氢搅拌摩擦焊接头表现出上级超塑性性能，包括较高的延伸率、小于1/2的流动应力和较低的超塑性温度。这些上级的超塑性性能主要归因于氢元素诱导的片层组织球化和高含量的β相。本研究为钛合金焊缝超塑成形提供了一种有效的方法，但仍需采用去氢工艺以避免氢脆。
It is rather difficult for Ti alloy welds to be superplastic formed due to their low superplasticity and high flow stress. In this study, the Ti-6Al-4V alloy after hydrogenation with 0.2 wt% hydrogen was subjected to friction stir welding (FSW). The superplastic behavior of the FSW joint was investigated. The stir zone with a fine lamellar microstructure exhibited a largest elongation of 660% at 825 °C and 3 × 10−3s−1. Besides, the stir zone showed a similar superplasticity of close to 600% to the base material at 825 °C, 3 × 10−4−1 × 10−3s−1. It is the first report on the superplasticity of FSW Ti alloy joints with hydrogenation. Compared to the FSW Ti-6Al-4V alloy joint without hydrogenation, the hydrogenated FSW joint showed superior superplastic properties, including a high elongation, less than a half flow stress and lower superplastic temperature. These superior superplastic properties were mainly attributed to the globularization of the lamellar microstructure and the high fraction of β phase induced by the hydrogen element. This study provides an effective way to reduce the difficulty of practical superplastic forming for Ti alloy welds, although a dehydrogenation process is still needed to avoid hydrogen embrittlement.
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发表时间：
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影响因子：
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