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热处理对新型高强钛合金组织与性能影响研究
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中南大学

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国家重点基础研究发展计划(973计划)


A study of heat treatment on microstructures and tensile properties of a new high strength titanium alloy
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central south university

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    摘要:

    本论文研究了新型高强钛合金(Ti-6Al-6Mo-4V)的微观结构和力学性能。分在α/β和β区固溶处理后,在460℃~620℃5个不同温度下时效6h,研究合金的组织与性能之间的关系。结果表明,α/β区固溶时效处理后的性能与β单相区固溶时效处理后相比,α/β区固溶时效处理后合金获得更好的强度和塑性组合。在850℃(α/β区域)固溶处理以及460℃时效后,合金获得最高的强度为1572MPa,伸长率为2.63%;在620℃时效时,合金的伸长率达到最高为11.46%,但强度较低为1201MPa。经过825℃固溶处理,540℃时效后,该合金获得最好的强度(1328MPa)和伸长率(7.58%)匹配。同时,β区溶液处理后的β晶粒较大,时效后形成细小的二次α相 ,导致强度和塑性较差。

    Abstract:

    In this paper, the microstructure and mechanical properties of a high strength titanium alloy (Ti–6Al–6Mo–4V) were firstly investigated. The relationship between microstructures and properties of the alloys were investigated after solution treatment at α/β and β regions and then aging at five different temperatures ranging from 460℃ to 620℃ for 6h. The results illustrate the alloys after α/β region solution treatment and aging show a more attractive combination of strength and elongation than β solution treatment and aging. After solution treatment at 850℃ (α/β region) and aging at 460℃, the alloy obtains the highest strength (1572MPa) with elongation (2.63%). When aging at 620℃, the alloy obtains the highest elongation (11.46%) but lower strength (1201MPa). After solution treatment at 825℃ plus aging at 540℃, this alloy reaches a great combination of strength (1328MPa) and elongation (7.58%).Meanwhile, due to the large β grains after β region solution treatment and fine secondary α forms during aging, it does not obtain an attractive strength after β region solution treatment plus aging.

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盛金文.热处理对新型高强钛合金组织与性能影响研究[J].稀有金属材料与工程,2020,49(3):825~832.[shengjinwen. A study of heat treatment on microstructures and tensile properties of a new high strength titanium alloy[J]. Rare Metal Materials and Engineering,2020,49(3):825~832.]
DOI:10.12442/j. issn.1002-185X.20181124

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  • 收稿日期:2018-11-08
  • 最后修改日期:2018-12-27
  • 录用日期:2018-12-29
  • 在线发布日期: 2020-04-08
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