The Evaluation of Thermomechanical and Heat Treatment Parameters on the ‎Microstructure and Tensile Properties of Ti-6Al-2Sn-4Zr-2Mo-0.08Si Alloy

Morakabati, Maryam; Abbasi, Seyed Mahdi; Mansouri, Yavar

doi:10.22034/frj.2024.402919.1179

The Evaluation of Thermomechanical and Heat Treatment Parameters on the ‎Microstructure and Tensile Properties of Ti-6Al-2Sn-4Zr-2Mo-0.08Si Alloy

Document Type : Original Research Article

Authors

Maryam Morakabati ¹

Seyed Mahdi Abbasi ²

Yavar Mansouri ³

¹ Associate Professor, Faculty of Materials and Manufacturing Technologies, Malek Ashtar ‎University of Technology, Tehran, Iran.‎

² Professor, Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of ‎Technology, Tehran, Iran.‎

³ M.Sc. Student, Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran

10.22034/frj.2024.402919.1179

Abstract

This research aims to study the effect of the cooling environment after secondary rolling and the annealing temperature on the microstructure and tensile properties of the near alpha Ti-6242S alloy. The produced ingot was homogenized and hot rolled at 1150^oC. Then, the transit temperature of alpha to the beta of the alloy was determined as 1000±5^oC via heat treatment and hot torsion test. Subsequently, the strips were secondary hot rolled at 940^oC and cooled at water and air. Then, they were solution annealed for 1 hour at 940 and 970^oC, and water quenched and aged. Afterwards, the microstructure was studied and the tensile test was performed at 25 and 480^oC. Results showed that the specimens with the same cooling environment annealed at 970^oC as compared with the ones annealed at 940^oC, have the microstructure with more rounded and lower volume fraction of primary alpha phase and wider secondary alpha phase results to the achievement of higher strength and ductility. Besides, the increase in strength of the specimens cooled in air compared to the ones cooled in water after rolling is related to the higher volume fraction of the alpha phase leading to a decrease in ductility.

Keywords

Secondary rolling

Cooling environment

Annealing heat treatment

ءMicrostructure

Tensile test

Subjects