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

WANG Zhen, CAO Lei, LIU Renci, LIU Dong, CUI Yuyou, YANG Rui

doi:10.3724/SP.J.1037.2013.00572

Acta Metall Sin >

2013 , Vol. 49 >Issue 11: 1487 - 1492

DOI: https://doi.org/10.3724/SP.J.1037.2013.00572

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

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

Received date: 2013-09-09

Revised date: 2013-09-24

Online published: 2013-11-11

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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

Cite this article

WANG Zhen, CAO Lei, LIU Renci, LIU Dong, CUI Yuyou, YANG Rui . EFFECT OF COOLING RATE ON MICROSTRUCTURE AND TENSILE PROPERTIES IN Ti₃Al ALLOY[J]. Acta Metall Sin, 2013 , 49(11) : 1487 -1492 . DOI: 10.3724/SP.J.1037.2013.00572

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