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电子束选区熔化Ti-6Al-4V显微组织与疲劳性能研究
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北京航空制造工程研究所,北京航空制造工程研究所,北京航空制造工程研究所,

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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)


Investigation of Microstructure and Fatigue Behavior of EBSM Ti-6Al-4V
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Beijing Aeronautical Manufacturing Technology Research Institute,Beijing Aeronautical Manufacturing Technology Research Institute,Beijing Aeronautical Manufacturing Technology Research Institute,

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    摘要:

    采用电子束选区熔化成型技术制备了Ti-6Al-4V合金试样,研究了成型态与热等静压态的显微组织、拉伸及高周疲劳性能。结果表明,成型态的组织为沿沉积方向生长的柱状晶;柱状晶内部以魏氏组织为主,也有α/β片层组织存在。成型态材料的拉伸强度并未受到少量气孔及未熔合缺陷的影响,其强度和延伸率达到了ASTM标准。热等静压消除了材料内部缺陷,但显微组织发生粗化,材料抗拉强度下降约5%,但延伸率提高了约35%。热等静压后Ti-6Al-4V合金的高周疲劳性能得到显著改善,在1×107寿命,R=0.1的测试条件下,疲劳极限达到600MPa。根据断口信息分析了典型试样的裂纹萌生与扩展行为,大多数试样的裂纹源位于表面,材料拉伸性能分散性较大是疲劳寿命分散性大的主要原因之一。

    Abstract:

    The microstructure, tensile and fatigue properties of Ti-6Al-4V alloy made by EBSM were studied. The as-build material exhibited a columnar microstructure in which the prior-β grains grew along the build direction. Within each β grain, Widmanst?tten microstructure is dominant, and colonies of α/b platelets were also present.The tensile strength of as-build material was not affected by defects and the average tensile strength and ductility meet the ASTM standard. HIPpingremoved all defects in the EBSMTi-6Al-4V alloyand increased tensile elongation by ~35%, but the strength was 5% lower due to microstructure coarsening. The fatigue life was also significantly improved by HIPping and the fatigue limit reached 600MPa under 1×107 cycle, R=0.1 condition. The large scatter of fatigue life is mailyattributed to the scatter of tensile properties. In most of the samples, crack initiated from the surface. The crack initiation mechanism was proposed base on fracture analysis of typical fatigue specimens.

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陈玮,陈哲源,由洋,李金山.电子束选区熔化Ti-6Al-4V显微组织与疲劳性能研究[J].稀有金属材料与工程,2017,46(S1):25~30.[Chen Wei, Chen Zheyuan, You Yang, Li Jinshan. Investigation of Microstructure and Fatigue Behavior of EBSM Ti-6Al-4V[J]. Rare Metal Materials and Engineering,2017,46(S1):25~30.]
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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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