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Cr含量对核用近α钛合金组织与性能的影响
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1.西北工业大学材料学院;2.西北有色金属研究院

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国家重点研发计划项目2016YFB0301201,陕西省重点科技创新团队计划项目2016KCT-27


Effect of Cr Element on the Microstructure and Mechanical Properties of near-α titanium Alloy for Pressure Vessel of Nuclear Reactor
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Northwestern Polytechnical University

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    摘要:

    本文以核用新型Ti-Al-V-Zr系近α钛合金为研究对象,在基础合金上添加0.76wt%与1.52wt%的Cr元素,研究了Cr含量对近α钛合金组织及性能的影响规律。研究结果表明:Cr的添加量在0.76wt%左右,合金等轴α晶粒尺寸最小;XRD结果显示,Cr含量增加,合金中的β相含量增加。经过900℃退火后发现,Cr能促进了组织中次生α的析出,阻止加热过程中等轴α晶粒过快长大;Cr元素的加入,在不降低合金塑性的条件下,可以显著提高合金的室温抗拉强度和屈服强度。示波冲击试验发现:Cr含量在0.76wt%左右,合金的冲击韧性值最大,屈强比最高。断口结果表明:Cr含量在0.76wt%的T2合金比其他合金断口处颈缩明显,韧窝深,切撕裂棱较小,断裂路径曲折,这与合金的组织中次生α相的数量与形状有关。

    Abstract:

    :. The effects of Cr content on the microstructures, phases, tensile properties and impact properties of the Ti-Al-V-Zr alloys with addition of 0.76%~1.52%Cr were investigated for nucleus applications. Microstructural analyses were carried out using scanning microscopy,SX-ray diffractionSand quantitative microprobe analysisAdditions of Cr refined the microstructure of such modified alloys, but the microstructure with the amount of 0.76wt% Cr was markedly smaller in comparison with others.XRD results that the total amount of β phase increased with Cr increased at 1.52wt%. Cr additions improved significantly the strength significantly but not improved the plasticityof the modified alloys. T2 alloy has much higher value of the impact toughness and energy among all the studied the alloys. The experimental results indicate that the fracture in Ti-Al-V-Zr alloysinfluencedby Cr additions considering the influence of the number and the shape of the secondαphase. They have the great potential to become new candidates for nucleus applications.

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赵彬,赵永庆,罗媛媛,侯智敏,张菁丽,吴金平,张平祥. Cr含量对核用近α钛合金组织与性能的影响[J].稀有金属材料与工程,2019,48(8):2640~2646.[zhaobin, zhaoyongqing, luoyuanyuan, houzhimin, zhangjingli, wujinping, zhangpingxiang. Effect of Cr Element on the Microstructure and Mechanical Properties of near-α titanium Alloy for Pressure Vessel of Nuclear Reactor[J]. Rare Metal Materials and Engineering,2019,48(8):2640~2646.]
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  • 收稿日期:2018-10-22
  • 最后修改日期:2018-12-24
  • 录用日期:2018-12-24
  • 在线发布日期: 2019-09-05
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