冷却速率对<span>Ti</span><sub>3</sub>Al合金组织和拉伸性能的影响

doi:10.3724/SP.J.1037.2013.00572

金属学报

2013, Vol. 49

Issue (11): 1487-1492 DOI: 10.3724/SP.J.1037.2013.00572

论文

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冷却速率对Ti₃Al合金组织和拉伸性能的影响

王震¹⁾,曹,磊^1,2),刘仁慈¹⁾,刘冬¹⁾,崔玉友¹⁾,杨,锐¹⁾

1)中国科学院金属研究所, 沈阳 110016
2)东北大学材料与冶金学院, 沈阳 110819

EFFECT OF COOLING RATE ON MICROSTRUCTURE AND TENSILE PROPERTIES IN Ti₃Al ALLOY

WANG Zhen¹⁾, CAO Lei^1,2), LIU Renci¹⁾, LIU Dong¹⁾, CUI Yuyou¹⁾, YANG Rui¹⁾

1) Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
2) College of Materials and Metallurgy, Northeastern University, Shenyang 110819

引用本文:

王震,曹,磊,刘仁慈,刘冬,崔玉友,杨,锐. 冷却速率对Ti₃Al合金组织和拉伸性能的影响[J]. 金属学报, 2013, 49(11): 1487-1492.
. EFFECT OF COOLING RATE ON MICROSTRUCTURE AND TENSILE PROPERTIES IN Ti₃Al ALLOY[J]. Acta Metall Sin, 2013, 49(11): 1487-1492.

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摘要:

对两相区锻造的Ti₃Al合金棒材分别在1020和1150℃保温30 min,以10, 1.5和0.3℃/s速度冷至室温, 研究了冷速对Ti₃Al合金组织和拉伸性能的影响.结果表明, 在1020℃固溶, 冷速为10℃/s时, 合金主要由B2相和α₂相组成;降低冷速, 基体中均匀析出针状α₂/O相; 冷速为0.3℃/s,等轴α₂/O相体积分数增加, 针状α₂/O相粗化.随着冷速下降, 合金的室温强度先升高后下降, 塑性先降低后提高;600℃拉伸强度逐渐下降, 塑性提高. 在1150℃固溶, 快速冷却时,合金主要由B2相构成, 晶粒尺寸约为440 μm; 降低冷速, 晶内均匀析出α₂/O相,呈网篮状; 冷速0.3℃/s时, 基体中析出的α₂/O相片层呈集束状.随着冷速下降, 室温强度下降, 而塑性先升高后降低; 600℃拉伸强度先升高后降低, 而塑性逐渐上升.结合组织分析表明, Ti₃Al合金的强度取决于晶界和α₂/O片层的尺寸,塑性受B2相体积分数以及α₂/O相的分布及体积分数影响. 冷速为1.5℃/s时,Ti₃Al合金具有良好的综合力学性能.

关键词 ： Ti₃Al合金, 冷却速率, 显微组织, 拉伸性能

Abstract：

The microstructure and tensile properties in Ti₃Al alloy rod by forging in the (B2+α₂) region after heating at 1020 and 1150℃ for 30 min and cooling to room temperature at the cooling rates of 10, 1.5 and 0.3℃/s were investigated. The results showed that Ti₃Al alloy structure was mainly composed of B2 phase and α₂ phase at the cooling rate of 10℃/s after heating at 1020℃. With the decrease of cooling rate, the acicular α₂/O phase homogeneously precipitated in the matrix on slow cooling. The volume fraction of equiaxed α₂/O phase increased and the acicular α₂/O phase was coarsed under the cooling rate of 0.3℃/s. For room temperature tensile tests, the data indicated that the strength initially increased and then decreased and the ductility firstly decreased and then increased with reducing cooling rate. During the 600℃ tensile tests, the strength decreased monotonically and ductility rose as reducing cooling rate. When solid solution temperature was 1150℃, Ti₃Al alloy was mainly composed of B2 phase and the size of grain was 440 $\mu$m by fast cooling. Basketweave structure was obtained in the grain at the cooling rate of 1.5℃/s. The α₂/O phase colony precipitated in the B2 phase with further reducing the cooling rate. With the decrease of cooling rate, the strength decreased gradually and ductility initially increased and then decreased at the room temperature, the 600℃ tensile strength firstly went up and then down and ductility increased. Through microstructure analysis, strength in Ti₃Al alloy is controlled by boundary and the size of α₂/O phase, and ductility is decided by the number of B2 phase and α₂/O phase and the shape of α₂/O phase. The good comprehensive properties were obtained at the cooling rate of 1.5℃/s.

Key words： Ti₃Al alloy cooling rate microstructure tensile property

收稿日期: 2013-09-09

作者简介: 王震, 男, 1985年生, 博士生

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https://www.ams.org.cn/CN/10.3724/SP.J.1037.2013.00572 或 https://www.ams.org.cn/CN/Y2013/V49/I11/1487

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