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再結(jié)晶溫度對(duì)大塑性熱變形Ti–6Al–4V微觀組織與力學(xué)性能的影響
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1.貴州大學(xué) 材料與冶金學(xué)院;2.貴州省材料結(jié)構(gòu)與強(qiáng)度重點(diǎn)實(shí)驗(yàn)室;3.高性能金屬結(jié)構(gòu)材料與制造技術(shù)國(guó)家地方聯(lián)合工程實(shí)驗(yàn)室

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貴州省科技重大專項(xiàng)(黔科合[2014]6013)


Effect of recrystallization temperature on microstructures and mechanical properties of severe plastic thermo deformation Ti–6Al–4V alloy
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1.College of Materials and Metallurgy,University of Guizhou;2.Key Laboratory for Material Structure and Strength of Guizhou Province

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    摘要:

    將Ti–6Al–4V雙相鈦合金加熱至α+β相區(qū),利用墩拔方式進(jìn)行大塑性熱變形,然后將其置于不同的溫度下進(jìn)行再結(jié)晶保溫?zé)崽幚?。結(jié)果表明:材料經(jīng)形變熱處理后,晶粒轉(zhuǎn)變?yōu)榧?xì)小的等軸α晶粒以及條狀α+β組織,隨再結(jié)晶溫度的升高,等軸α晶粒逐漸長(zhǎng)大,條狀α+β組織也逐漸變大,發(fā)生再結(jié)晶晶粒的體積分?jǐn)?shù)在增加,小角度晶界所占比例減小。800℃再結(jié)晶后延伸率和斷面收縮率高達(dá)19.9%及42.5%,材料的綜合力學(xué)性能則隨再結(jié)晶溫度的升高呈下降趨勢(shì),原因歸結(jié)于晶粒的粗化及晶粒的均勻性變差所致。

    Abstract:

    The Ti–6Al–4V alloy were thermo-forged in α+β two phase region,and then recrystallized in three different temperatures. The results show that the initial microstructure were fully transformed into fine equiaxed α and lamellar α+β,the fine equiaxed α and lamellar α+βwere gradually coarsening as increasing recrystallization temperature,the relative frequency of recrystallization grain were also increased,low angle boundary shows a converse trend. The total elongation and area reduction reach up to 19.9% and 42.5%,the mechanical properties gradually decreased as the elevate temperature which were attribute to coarse and inhomogeneous grain.

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孫皓,梁益龍,張雄菲,李偉,楊明.再結(jié)晶溫度對(duì)大塑性熱變形Ti–6Al–4V微觀組織與力學(xué)性能的影響[J].稀有金屬材料與工程,2019,48(9):3015~3021.[Sun Hao, Liang Yilong, Zhang Xiongfei, Li Wei, Yang Ming. Effect of recrystallization temperature on microstructures and mechanical properties of severe plastic thermo deformation Ti–6Al–4V alloy[J]. Rare Metal Materials and Engineering,2019,48(9):3015~3021.]
DOI:10.12442/j. issn.1002-185X.20180293

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  • 收稿日期:2018-03-28
  • 最后修改日期:2018-05-03
  • 錄用日期:2018-08-09
  • 在線發(fā)布日期: 2019-10-09
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