<strong>Ti<sub>2</sub>AlNb</strong>异形粉末环件的轧制成形与性能研究

doi:10.11900/0412.1961.2019.00015

金属学报

2019, Vol. 55

Issue (6): 729-740 DOI: 10.11900/0412.1961.2019.00015

本期目录 | 过刊浏览

Ti₂AlNb异形粉末环件的轧制成形与性能研究

卢正冠^1,²,吴杰¹,徐磊¹(

),崔潇潇¹,杨锐¹

1. 中国科学院金属研究所沈阳 110016
2. 中国科学技术大学材料科学与工程学院沈阳 110016

Ring Rolling Forming and Properties of Ti₂AlNb Special Shaped Ring Prepared by Powder Metallurgy

Zhengguan LU^1,²,Jie WU¹,Lei XU¹(

),Xiaoxiao CUI¹,Rui YANG¹

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

引用本文:

卢正冠,吴杰,徐磊,崔潇潇,杨锐. Ti₂AlNb异形粉末环件的轧制成形与性能研究[J]. 金属学报, 2019, 55(6): 729-740.
Zhengguan LU, Jie WU, Lei XU, Xiaoxiao CUI, Rui YANG. Ring Rolling Forming and Properties of Ti₂AlNb Special Shaped Ring Prepared by Powder Metallurgy[J]. Acta Metall Sin, 2019, 55(6): 729-740.

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摘要:

采用预合金粉末热等静压工艺制备了名义成分为Ti-22Al-24.5Nb-0.5Mo (原子分数，%)的Ti₂AlNb合金及大尺寸异形环坯(直径大于800 mm)，采用热模拟压缩实验研究了Ti₂AlNb粉末合金的热变形行为，并对异形粉末环坯进行了轧制实验，分析了轧制前后的组织性能变化。结果表明，Ti₂AlNb粉末合金的热加工窗口宽且开裂倾向小，具有更均匀的化学成分和α₂相分布，但其应力抖动更加明显。优选1035~1045 ℃为Ti₂AlNb粉末异形环的变形温度区间，Ti₂AlNb粉末异形环坯经两火轧制后，无损检测表明无任何裂纹产生。热变形促使Ti₂AlNb粉末合金的O板条细化和α₂相球化，热处理后，粉末制坯+环轧成形Ti₂AlNb合金为近两相(B2+O)组织，合金的室、高温拉伸塑性显著提高。

关键词 ： Ti₂AlNb, 粉末冶金, 热等静压, 环轧成形

Abstract：

Ti₂AlNb alloy was considered as the candidate material to replace superalloys such as GH4169 in gas turbine engine applications due to higher strength-weight ratio at elevated temperatures. Powder metallurgy (PM) offers the potential for solving many of the problems associated with the large ingots, such as center-line porosity and chemical inhomogeneity. In order to study the feasibility of preparing Ti₂AlNb special shaped ring with large size, PM + ring rolling combined process is considered as a potential method and discussed in this work. PM Ti₂AlNb alloy and special shaped ring (D>800 mm) with a nominal composition of Ti-22Al-24.5Nb-0.5Mo (atomic fraction, %) were prepared from pre-alloyed powder using hot isostatic pressing (HIP). Hot compression tests of PM Ti₂AlNb alloy and wrought alloy with the same chemical composition were conducted on Gleeble-3800 testing machine under 930~1050 ℃ and 0.001~1 s^-1 conditions. Ring rolling was conducted on PM Ti₂AlNb special shaped ring by horizontal rolling machine, and the microstructure evolution and properties performance of PM ring after rolling forming process were studied. The results show that the processing window for PM Ti₂AlNb alloy is broader than that for wrought alloys, and wrought Ti₂AlNb alloy is easier to crack at low temperature or relative high strain rate. PM Ti₂AlNb alloy has more homogeneous chemical composition and uniform α₂ phase distribution. Stress instability phenomenon of PM Ti₂AlNb alloy is more obvious than that of wrought alloy which is related to phase transition of Ti₂AlNb alloy. Optimized deformation temperature for PM Ti₂AlNb special shaped ring was set as 1030~1045 ℃ with reference to the hot compression results. Ti₂AlNb special shaped ring after two rolling steps has no any kinds of defects presented by X-ray testing, ultrasonic testing and fluorescence detection. O laths inside PM Ti₂AlNb alloy become shorter and narrow, and α₂ phase tends to be a coarser and spherical structure due to the hot deformation. After a typical heat treatment (980 ℃, 2 h, AC+830 ℃, 24 h, AC), nearly B2+O microstructure is obtained in Ti₂AlNb special shaped ring. Compared with the undeformed alloy, tensile ductility at room temperature and 650 ℃ of Ti₂AlNb ring after hot deformation improves due to the refined O phase structure.

Key words： Ti₂AlNb powder metallurgy hot isostatic pressing ring rolling forming

收稿日期: 2019-01-17

ZTFLH:

TG337

作者简介: 卢正冠，男，1990年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2019.00015 或 https://www.ams.org.cn/CN/Y2019/V55/I6/729

图1 Ti2AlNb预合金粉末的独立粒度分布

表1 Ti2AlNb预合金粉末及异形环坯的化学成分

图2 Ti2AlNb预合金粉末的典型形貌

图3 Ti2AlNb热变形样品显微组织的SEM像

图4 2种包套尺寸Ti2AlNb粉末合金的相对密度分布图

图5 Ti2AlNb异形粉末环坯显微组织的SEM像

表2 Ti2AlNb异形粉末环坯与圆柱包套在室温和650 ℃的拉伸性能

图6 热压缩实验用Ti2AlNb合金的显微组织

表3 Ti2AlNb粉末合金与铸锭变形合金在不同变形条件下的峰值应力

图7 不同温度热压缩实验后Ti2AlNb样品形貌

图8 热压缩实验后Ti2AlNb显微组织的SEM像

图9 Ti2AlNb合金的显微CT图

图 10 Ti2AlNb合金的应变速率敏感因子(m)比较

图11 Ti2AlNb粉末环件的轧制图片

图 12 Ti2AlNb异形粉末环坯轧制前后显微组织的SEM像

表4 Ti2AlNb异形环的拉伸性能

图13 Ti2AlNb异形粉末环坯热处理前后的显微组织

图14 Ti2AlNb粉末合金的TEM像

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