Impact Factor:6.7

DOI number:10.1016/j.jmatprotec.2021.117327

Affiliation of Author(s):Hefei University of Technology

Journal:Journal of Materials Processing Technology

Key Words:Ti-alloy microstructure development Near-isothermal forming Thermo-mechanical-microstructural FE modeling

Abstract:In near-isothermal local loading forming (NLLF) of large-size Ti-alloy parts, one of the challenging issues is to achieve accurately prediction of complex microstructural development. In this work, a thermo-mechanicalmicrostructural FE model considering complicated phase transformation and morphology transformation of the whole forming process is developed and experimentally verified. The simulated distribution of phase amount for primary α (αp) and secondary α (αs) phases agrees well with the experimental results. Based on the model, the evolution characteristics of αp phase, lamellar αs (αls) phase, and globularized αs (αgs) phase for large-size Ti-alloy parts at different stages were investigated. It is found that αs phase amount in the first loading region is significantly higher than that in the second loading region, while αgsphase amount shows a reverse trend. Moreover, processing parameters including initial heating temperature, die loading speed, and loading pass greatly affect the relative amount and distribution uniformity of constituent phases among different loading regions. Finally, the formation mechanism of quasi-trimodal microstructures under NLLF of complex Ti-alloy parts is clarified by analyzing the coupling effects of applied deformation and phase transformation on the microstructure morphology. To achieve the regulation and control of the tri-modal microstructure, an optimized processing scheme is proposed.

Co-author:K.M. Xue

First Author:M. Meng

Indexed by:Journal paper

Correspondence Author:S.L. Yan,X.G. Fan

Document Code:117327

Discipline:Engineering

Document Type:J

Volume:299

Issue:-

Page Number:1-29

Translation or Not:no

Date of Publication:2022-01-21

Included Journals:SCI、EI

Links to published journals:https://www.sciencedirect.com/science/article/pii/S0924013621002879?via%3Dihub

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