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板坯组织类型及热处理工艺对Ti6321合金板材组织与性能的影响
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1.中国船舶重工集团公司第七二五研究所;2.洛阳双瑞精铸钛业有限公司

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装备发展部领域基金(61400040404)


Effect of Slab Microstructure Type and Heat Treatment Process on Microstructure and Properties of Ti6321 Alloy
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Affiliation:

1.Luoyang Ship Material Research Institute;2.Luoyang Sunrui Titanium Precision Casting Co., Ltd

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    摘要:

    结合力学性能测试和OM、SEM分析,研究了不同板坯组织类型和热处理工艺对Ti6321合金组织与性能的影响。结果表明:合金板坯的组织类型对轧制板材的组织与性能状态具有显著影响,经相同工艺轧制后,等轴组织板坯形成双态组织板材,魏氏组织板坯形成等轴组织板材。(α+β)/β相变点以下热处理,等轴组织板坯制备板材的纵、横向的屈服强度和抗拉强度低于魏氏组织板坯制备板材对应方向的强度,延伸率和冲击功则相反;随加热温度的升高,不同板坯组织制备的板材其屈服强度、抗拉强度略有降低,冲击功则急剧升高。高于(α+β)/β相变点热处理,两合金的拉伸性能和冲击功均明显下降。合金板材在α+β两相区热处理过程,初生α相对温度的敏感性高于对保温时间的敏感性。随着温度的升高,初生α相含量急剧下降,而次生片状α相含量明显增加。Ti6321合金板材适宜的热处理工艺为:(940℃~980℃)×(2~3)h。

    Abstract:

    The effects of slab microstructure type and heat treatment on mircrostructure and properties of Ti6321 alloy were studied by means of mechanical properties test,OM and SEM analysis. The results show that slab microstructure type of Ti6321 alloy has a significant effect on the microstructure and properties of the rolling sheet. By the same rolling process, that is, the first fire: 980℃ start rolling, finish rolling temperature 800℃, ε=70%, and the second fire: 995℃ start rolling, finish rolling temperature 800℃, ε=50%,equiaxed slabs form bimodal slabs, and Westernized slabs form equiaxed slabs. After annealing below (α+β)/β phase transformation point, the longitudinal and transverse yield strength and tensile strength of the plate made of equiaxed slab are higher than those of the corresponding direction of the plate made of Widmanstatten slab, while the elongation and impact energy are opposite. With the increase of annealing temperature, the yield strength and tensile strength of the sheets prepared with different slab structures decrease slightly, while the impact energy increases sharply. When annealed above (α+β)/β transformation point, the tensile properties and impact work of the two alloys decreased significantly. During the annealing process in the α+β two-phase zone, the sensitivity of the initial α phase to temperature is higher than that to the holding time of annealing. With the increase of temperature, the content of primary α phase decreases sharply, while the content of secondary flake α phase increases obviously. The suitable annealing process range of Ti6321 alloy is (940~980)℃/(2~3) h.

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杨胜利,孙二举,宋德军,李渤渤,郁炎,刘向前,张楠.板坯组织类型及热处理工艺对Ti6321合金板材组织与性能的影响[J].稀有金属材料与工程,2020,49(3):1002~1008.[Yang Shengli, Sun Erju, Song Dejun, Li Bobo, Yu Yan, Liu Xiangqian, Zhang Nan. Effect of Slab Microstructure Type and Heat Treatment Process on Microstructure and Properties of Ti6321 Alloy[J]. Rare Metal Materials and Engineering,2020,49(3):1002~1008.]
DOI:10.12442/j. issn.1002-185X.17Ti2019155

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  • 收稿日期:2019-01-29
  • 最后修改日期:2019-07-23
  • 录用日期:2019-07-30
  • 在线发布日期: 2020-04-08
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