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Microstructural evolution during water cooling after different processing conditions in Ti-6Al-4V alloy
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1.Shenyang Aerospace University;2.Shenyang Ligong University

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Fund Project:

the National 863 project of China (2015AA03A501) and Liaoning Provincial Science and Technology Plan Project (2015020189)

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    Abstract:

    It is important to understand the microstructural evolution during water quenching after different processing conditions in order to obtain optimum mechanical properties of Ti-6Al-4V alloy. The thermal simulation of Ti-6Al-4V alloy was conducted using a thermomechanical simulator. The results have shown that a fully martensitic microstructure was obtained after solution treatment. Water-quenching after solution resulted in hardness increase, and this was attributed to the presence of α′ and α″. The lamellar structure formed when the specimen was water-quenched after isothermal holding at 850℃, and the hardness further increased. Colony appeared after deformation at 850℃ subsequent water quenching, and the hardness reached the maximum value (Hv584). This was attributed to the grain boundaries strengthening. The microstructure composed of α phase, lamellar colonies α/β and colony when the specimen was isothermal held at 600℃ after deformation at 850℃. Cooling and isothermal holding after deformation resulted in an increase of the width of α phase and colony. It offered a range of 324-706 nm for equiaxed grains. This resulted in the hardness decrease.

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[Run-qi Zhang, Yi-qin Cai, Zhuang Li, Jin-yu Li, Qi Zhou, Xi-jun Cui. Microstructural evolution during water cooling after different processing conditions in Ti-6Al-4V alloy[J]. Rare Metal Materials and Engineering,2020,49(9):3005~3011.]
DOI:10.12442/j. issn.1002-185X.20190615

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History
  • Received:July 23,2019
  • Revised:October 10,2019
  • Adopted:October 11,2019
  • Online: October 15,2020
  • Published: