Effect of processing parameters on the morphology of α-phase in Ti-۶Al-۴V alloy during the two-step hot deformation

Publish Year: 1402
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_IJMF-10-3_007

تاریخ نمایه سازی: 25 فروردین 1403

Abstract:

The morphology of the α-phase in titanium alloys considerably affected their physical and mechanical properties. In this research, the effect of applied strain and inter-pass times on the morphology of the α-phase was studied in the two-step hot deformation process. Hot compression tests were performed at ۹۰۰ ºC and ۰.۰۰۱ s-۱ while the strains in the first and second passes were set as (first cycle: ۰.۶ and ۰.۳) and (second cycle: ۰.۳ and ۰.۶) respectively, with various inter-pass times. The work softening parameter obtained from the stress-strain curves showed that the proper time for globularization of α-layers for the first pass strain of ۰.۶ was ۲۴۰ s and for the second strain of ۰.۳ it was ۲۴۰ and ۳۰۰ s. Microstructure results indicated that the first pass strain of ۰.۳ and the inter-pass time of ۲۴۰ s were the optimum conditions for globularization of α layers.

Keywords:

Ti-۶Al-۴V alloy , Two-step hot deformation process , Microstructure

Authors

H. R. Ezatpour

Hakim Sabzevari University

Gholam Reza Ebrahimi

Materials and Metallurgical Engineering Department, Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran

Fateme Zarghani

Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar, Iran