A modified Hansel-Spittel constitutive equation of Ti-6Al-4V during cogging process
Niu, Liqun 1Zhang, Qi 1Wang, Bo 1Han, Bin 1Li, Hao 1Mei, Tangjie1
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作者信息
1. Xi An Jiao Tong Univ
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Abstract
The isothermal compression of four typical microstructures in the cogging process for Ti-6Al-4V was conducted at strain rates ranging from 0.01 to 1 s(-1) with varying temperatures. The flow behavior of dif-ferent microstructures was compared. The Hansel-Spittel (H-S) and strain compensated Arrhenius (S-C-A) constitutive equations (CEs) were calibrated. To improve prediction ability, a modified H-S CE considering the evolution of microstructure was proposed and embedded in the finite element code. The original, modified H-S, and S-C-A CEs were evaluated based on the average absolute error (W) and relative error ratio (Delta%). Compared with the original H-S and S-C-A CEs, the W (-2.5%similar to 2.5%) of the modified CE was found to be smaller and the Delta% was more concentrated. Furthermore, hot forging experiment and finite element si-mulation (FES) at different speeds were performed. The average relative error (AARE) of load-stroke for the H-S and modified H-S CEs is 13.51% and 3.67%, respectively. The comparisons between the FES and hot forging experiment indicate that the modified CE is more accurate for the simulation of the cogging process. (C) 2021 Elsevier B.V. All rights reserved.
NSTL
Elsevier