Investigation of surface cracking of hot-extruded AA7075 billet

被引：11

作者：

Ngernbamrung, Sukunthakan ^{[1
]}

Suzuki, Yudai ^{[1
]}

Takatsuji, Norio ^{[1
]}

Dohda, Kuniaki ^{[2
]}

机构：

[1] Univ Toyama, Grad Sch Sci & Engn Educ, Gofu Ku, Toyama, Toyama 9308555, Japan

[2] Northwestern Univ, Dept Mech Engn, 2145 Sheriden Rd, Evanston, IL 60208 USA

来源：

PROCEEDINGS OF THE 17TH INTERNATIONAL CONFERENCE ON METAL FORMING METAL FORMING 2018 | 2018年 / 15卷

关键词：

Aluminum alloy 7075; Surface cracking; Hot extrusion; Tearing; Porthole die; GRAIN-BOUNDARIES; SEGREGATION; DIFFUSION; ALLOY;

D O I：

10.1016/j.promfg.2018.07.212

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Extrudability of AA7075 is determined by tearing occurring through extrusion conditions by extrusion limit diagram relating to temperatures and speeds. Extruded parts were observed for tearing appearance and analyzed elements. As results, localization of melting by local heat generated by friction coupled with tension stress and zinc-segregated concentration stimulates tearing sensitivity. Furthermore, at small grain region, zinc-segregated concentration is well scattered without tearing. Therefore, an attempt to control microstructure in die by a newly-developed twist-groove porthole die is proposed to induce large severe deformation in die leading to grain refinement reducing tearing sensitivity to accelerate speed in hot extrusion. (C) 2018 The Authors. Published by Elsevier B.V.

引用

页码：217 / 224

页数：8

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