A multi-scale constitutive model based gas pressure determination method for the grain size evolution of superplastic forming

被引：0

作者：

Yang, Junzhou ^{[1
,2
,3
]}

Zhang, Qianwen ^{[2
,4
]}

Wang, Kuaishe ^{[1
,3
]}

Wu, Jianjun ^{[2
]}

Hu, Ping ^{[1
,3
]}

机构：

[1] School of Metallurgy Engineering, Xi'an University of Architecture and Technology, Xi'an

[2] School of Mechanical Engineering, Northwestern Polytechnical University, Xi'an

[3] National and Local Joint Engineering Research Functional Center for Materials Processing, Xi'an University of Architecture and Technology, Xi'an

[4] AVIC Xi'an Aircraft Industry Group Company Ltd., Xi'an

来源：

International Journal of Lightweight Materials and Manufacture | 2024年 / 7卷 / 06期

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Forming process; Grain size; Superplastic forming; Ti–6Al–4V;

D O I：

10.1016/j.ijlmm.2024.06.002

中图分类号：

学科分类号：

摘要：

This paper proposes an innovative multi-scale method for determining gas pressure parameters of superplastic forming, which is based on the quantitative relationship between the grain growth mechanism and fracture mechanism of Ti–6Al–4V alloy. The high-temperature tensile tests were conducted on the material at temperatures ranging from 700, 800, 840, 890, 920, and 950 °C, strain rates were selected as 10−2∼10−4/s. The grain size measurements were observed using electron back-scatter diffraction (EBSD). Particularly, the relation between grain size changes and fracture behaviour is specifically discovered using a physically-based dynamic material model (DMM), and the grain size thresholds for each forming limit are proposed. The physical fracture mechanism is named the “Grain growth based fracture (GGBF)” mechanism. Furthermore, an innovative method based on the GGBF mechanism is proposed to design the superplastic forming loading, and practical four-layer hollow structures experiments are applied to validate the fracture mechanism in superplastic forming. In total, A superplastic forming GGBF mechanism has been verified, and it is expected to be helpful for shape and property control in the forming process of complex structures. © 2024 The Authors

引用

页码：825 / 837

页数：12

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