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噴射沉積2195鋁鋰合金軋制板材晶粒組織及性能控制研究
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中南大學(xué)

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國家重大基礎(chǔ)研究項(xiàng)目(2017YFB0306301)


Grain structure and mechanical property control study of spray deposited 2195 Al-Li alloy
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Central South University

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    摘要:

    研究了噴射沉積制備2195鋁鋰合金錠坯擠壓板坯經(jīng)不同終軋溫度熱軋至6 mm厚度板材,以及經(jīng)不同中間退火后再冷軋至6 mm厚度板材固溶后的晶粒組織。結(jié)果表明,終軋溫度290?C時,熱軋板固溶后表層為粗大再結(jié)晶晶粒,而中心層為細(xì)長纖維狀晶粒;終軋溫度降低至220?C時,雖然表層再結(jié)晶晶粒尺寸減小,但中心層轉(zhuǎn)變?yōu)槌叽绱执蟮拈L條狀再結(jié)晶晶粒。板材中尺寸1 ?m以上的富Cu第二相粒子數(shù)量隨中間退火(空冷)溫度的增加(從330?C提高至450?C)而增加;冷軋固溶后表層等軸狀再結(jié)晶晶粒尺寸增加,而中心層晶粒逐漸由粗大長條狀再結(jié)晶晶粒轉(zhuǎn)變?yōu)榧?xì)小等軸狀再結(jié)晶晶粒。適當(dāng)溫度中間退火、隨爐冷卻并冷軋、固溶后表層和中心層全部為細(xì)小等軸狀再結(jié)晶晶粒。優(yōu)化中間退火后的冷軋板材T8時效態(tài)強(qiáng)度最高,而終軋溫度220?C的熱軋板材T8時效態(tài)強(qiáng)度最低。

    Abstract:

    A spray deposited 2195 Al-Li alloy ingot was extruded into plates. Some of the extruded plates were hot rolled down to the thickness of 6 mm with different finish rolling temperature, and others were cold-rolled down to the thickness of 6mm after different intermediate annealing. The surface layer of the plate with finish rolling temperature 290°C consists of coarse recrystallized grains, but the center layer cosnsits of non-recrystallized fine fibrous grains. As the finish rolling temperature is lowered to 220°C, the size of the recrystallized grain in the surface layer is decreased, but grains in the center layer are transferred to coarse elongated recystallized grains. As the intermediate annealing temperature was elevated from 330°C to 450°C, the number density of Cu-rich secondary phase particles with size larger than 1 mm increases, the recrystallized grain in the surface layer of the cold-rolled plate after solutionization coarsenes, and the center layer grain were transferred to small equi-axed recrystallized grains from coarse elongated recrystallized grains. After approporiate intermediate annealing followed by furnace cooling, the cold-rolled plate through thickness after solutionization developed into fine recrystallized grains. After a same T8 aging, the strength of the cold-rolled plates are higher than that of the hot-rolled plates, and that of the plate with a finish rolling temperature of 220°C is the lowest.

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唐建國,劉添樂,李睿,馬云龍,李勁風(fēng).噴射沉積2195鋁鋰合金軋制板材晶粒組織及性能控制研究[J].稀有金屬材料與工程,2020,49(4):1337~1344.[Tang Jianguo, Liu Tianle, Li Rui, Ma Yunlong, Li Jinfeng. Grain structure and mechanical property control study of spray deposited 2195 Al-Li alloy[J]. Rare Metal Materials and Engineering,2020,49(4):1337~1344.]
DOI:10.12442/j. issn.1002-185X.20190812

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  • 收稿日期:2019-10-05
  • 最后修改日期:2019-11-19
  • 錄用日期:2019-11-19
  • 在線發(fā)布日期: 2020-05-07
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