Direct observation of hot tearing of Al-7%Si-0.35%Mg alloy

被引：1

作者：

Yamagata, Hiroshi ^{[1
]}

Tachibana, Hiroshi ^{[2
]}

Kijima, Shuya ^{[3
]}

Adachi, Mitsuru ^{[2
]}

Koiwai, Shuji ^{[2
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Sendai, Miyagi, Japan

[2] Koiwai Co Ltd, Odawara, Japan

[3] UES Software Asia Co Ltd, Fujisawa, Kanagawa, Japan

来源：

ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES | 2018年 / 4卷 / 03期

关键词：

Hot tearing; Al-7 mass% Si-0; 35 mass% Mg alloy; sand casting; FEM simulation; thermal stress; direct observation;

D O I：

10.1080/2374068X.2018.1463137

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Hot tearing of an Al-7%Si-0.35%Mg alloy T-shaped specimen was analyzed by direct observation of cracking and a finite element method (FEM) stress simulation. The semi-solid state during cooling enables direct observation of corner surface cracks. Crack opening appears to begin before the solid fraction reaches 0.3. However, a liquid phase infiltrates and disturbs the crack opening process. After the onset of the eutectic reaction, crack opening resumes and is detected as hot tearing. The FEM stress analysis revealed that tensile stress concentrates at the corners of the T-shaped specimen. The tensile stress increases with time at the initial stage of solidification, peaks at around 170 s, and then decreases. Microstructural observation of cooled and quenched specimens reveals that if the inter-dendritic liquid phase is adequate and has high fluidity, then healing of the crack occurs.

引用

页码：480 / 492

页数：13

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