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Ti-22Al-24Nb-0.5Mo电子束焊接接头组织性能研究
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北京航空制造工程研究所高能束流加工技术重点实验室,中国科学院金属研究所,北京航空制造工程研究所高能束流加工技术重点实验室,北京航空制造工程研究所高能束流加工技术重点实验室

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国家自然科学基金资助项目(59493300);教育部博士点基金资助项目(9800462)


Microstructure and mechanical properties of Ti-22Al-24Nb-0.5 EBW
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Power Beam Processing Lab,Beijing Aeronautical Manufacturing Technology Research Institute,Institute of Metal Research,Chinese Academy of Sciences,Liaoning Shenyang,Power Beam Processing Lab,Beijing Aeronautical Manufacturing Technology Research Institute,Power Beam Processing Lab,Beijing Aeronautical Manufacturing Technology Research Institute

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    摘要:

    对Ti-22Al-24Nb-0.5Mo合金的电子束焊接接头开展研究,焊接接头熔合区由B2相柱状晶和分布在上下边缘的少量枝状晶组成,并且沿中心轴对称分布。对焊接接头进行了850oC/2hr/AC(时效)与980oC/2hr+850oC/24hr/AC(固溶+时效)两种热处理,时效态接头熔合区的B2相中析出了大量针状O相,而固溶+时效态熔合区的O相更为粗大,且α2相重新形成。两种热处理后接头的常温拉伸性能相近,但在高温下时效态接头的强度稍高。固溶+时效态接头的650oC持久寿命高于时效态,失效模式都为沿晶断裂。

    Abstract:

    The Ti-22Al-24Nb-0.5Mo electron beam weld was investigated. The FZ is composed of fully collunar B2 grains in the FZ center and the dentritic B2 grains on top and bottom of the weld. Their distribution is symmetrical to the fusion line center. Two post-weld annealing schedules, namely 850oC/2hr/AC (anneal) and 980oC/2hr+850oC/24hr/AC (solution treat + anneal), have been used. The STA weld exhibits a coarser O phase than the annealed weld in the FZ and the α2 phase reappeared.The tensile strength of the welds for these two annealing conditions are similar at room temperature, while the annealed weld is a little stronger at 650oC. The creep rupture life of the STA weld is higher, and the fracture mode is intergranular for both annealed and STA welds.

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陈玮,陈志勇,赵桐,唐振云. Ti-22Al-24Nb-0.5Mo电子束焊接接头组织性能研究[J].稀有金属材料与工程,2017,46(S1):31~35.[Chen Wei, Chen Zhiyong, Zhao Tong, Tang Zhenyun. Microstructure and mechanical properties of Ti-22Al-24Nb-0.5 EBW[J]. Rare Metal Materials and Engineering,2017,46(S1):31~35.]
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  • 收稿日期:2016-05-11
  • 最后修改日期:2016-05-11
  • 录用日期:2017-08-08
  • 在线发布日期: 2017-12-13
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