擠壓鑄造零件沿流程方向的成分偏析及組織偏聚

郭莉軍; 邢書明; 敖曉輝; 郭洪鋼

doi:10.13374/j.issn2095-9389.2017.07.009

擠壓鑄造零件沿流程方向的成分偏析及組織偏聚

doi: 10.13374/j.issn2095-9389.2017.07.009

1) 北京交通大學機械與電子控制工程學院, 北京 100044
2) 長城汽車股份有限公司, 保定 071000

基金項目:

吉林省重點攻關計劃資助項目(2013020635GX)

國家國際科技合作專項資助項目(2014DFA53050)

詳細信息

中圖分類號: TG156.8;TG249.2
計量
- 文章訪問數: 845
- HTML全文瀏覽量: 263
- PDF下載量: 14
- 被引次數: 0
出版歷程
- 收稿日期: 2016-08-02

Microstructure and composition segregation along the fluidity length of aluminum alloy in squeeze casting

1) School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China
2) Great Wall Motor Co. Ltd., Baoding 071000, China

摘要

摘要: 采用擠壓鑄造(液態模鍛)工藝制備了A357鋁合金螺旋線試件,使用化學成分分析和金相分析方法研究了流程長度對合金成分偏析及組織偏聚的影響.結果表明:在沿流程方向上,流程的開始端和流程末端的Si元素和Mg元素含量大于流程中段的含量.合金的初始α晶粒尺寸隨著流程長度的增加先增大后變小.初生固相率隨著流程長度的增大呈現波動變化.造成流程成分偏析和組織變化的原因是在擠壓鑄造凝固階段中補縮液相的強迫運動.
- 擠壓鑄造 /
- 流程長度 /
- 成分偏析 /
- 組織偏聚
Abstract: This study investigated the spiral line sample of A357 prepared by the squeeze casting (liquid die forging) process and the influence of the fluidity length on the composition segregation and microstructure segregation through chemical composition and metallographic analyses. The results show that the Si and Mg mass fractions of the start and the end of the spiral line sample along the flow length are greater than that in the middle of the spiral line sample. The initial grain size of α first increases, then decreases with the increase of the fluidity length. Meanwhile, the phase rate of the primary solid shows a fluctuating change with the increase of the fluidity length. The composition segregation and the microstructure change are caused by the forced flow of the filling liquid in the squeeze casting process.
- squeeze casting /
- fluidity length /
- composition segregation /
- microstructure segregation

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參考文獻(5)

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