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Effect of hydrogen addition on the microstructure of TC21 alloy

机译：加氢对TC21合金组织的影响

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摘要

TC21 alloy was hydrogenated at 750 ℃ with different hydrogen contents ranging from 0 to 0.873 wt.%H, and its microstructural evolution and phase transformations were investigated by optical microscopy (OM) and X-ray diffraction (XRD). The microhardness and the β transus temperature for the hydrogenated TC21 alloy were determined by microhardness testing and metallographical approach, respectively. The results show that, hydrogen addition has a noticeable influence on microstructure, phase composition, microhardness and β transus temperature of TC21 alloy. With increasing hydrogen content, the β phase increases, the α/β interfaces of lamellar transformed β phase disappear, the lattice parameter of β phase increases and the β transus temperature decreases for the hydrogenated TC21 alloy. In comparison to the as-received TC21 alloy, the contrasts of primary α phase and transformed β phase under optical microscope in the hydrogenated TC21 alloy with high hydrogen content are reversed completely. Furthermore, the γ and 8 hydrides are detected in the hydrogenated TC21 alloy. In addition, the variations of phase compositions for the hydrogenated TC21 alloy have influence on microhardness and β transus temperature.
机译：TC21合金在750℃氢化，氢含量从0到0.873 wt。％H不等，通过光学显微镜（OM）和X射线衍射（XRD）研究了它的组织演变和相变。氢化TC21合金的显微硬度和β转变温度分别通过显微硬度测试和金相方法确定。结果表明，添加氢对TC21合金的组织，相组成，显微硬度和β转变温度有明显影响。随着氢含量的增加，氢化TC21合金的β相增加，层状相变β相的α/β界面消失，β相的晶格参数增加，β转变温度降低。与原先的TC21合金相比，氢含量高的氢化TC21合金在光学显微镜下的初生α相和相变β相的对比度完全相反。此外，在氢化的TC21合金中检测到γ和8个氢化物。另外，氢化TC21合金的相组成的变化对显微硬度和β转变温度有影响。

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