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高速列车铝合金齿轮箱微观夹杂物研究
Study on Micro Inclusions in Aluminum Alloy Gearbox for High-speed Train
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- DOI:
- 作者:
- 周斌1龚家林1秦颐鸣2
ZHOU Bin 1 , GONG Jialin 1 , QIN Yiming 2
- 作者单位:
- 1. 中车戚墅堰机车车辆工艺研究所有限公司2. 吉利百矿集团有限公司
1.CRRC Qishuyan Institute Co., Ltd., Changzhou 213011, China; 2. Geely Baikuang Group Co., Ltd., Baise 533000, China
- 关键词:
- 齿轮箱;夹杂物;富铁相;AlSi7Mg;
gearbox; inclusion; iron-rich phase; AlSi7Mg
- 摘要:
- 为提升高速列车齿轮箱的可靠性，采用金相及 EDS 能谱分析研究了高铁齿轮箱材料中的微观夹杂物的形
态及成分。 结果表明，微观夹杂物主要是富 Fe 相。 通过 MAGMAsoft 软件模拟齿轮箱铸造过程发现，快速凝固时，形成
的 Fe 相呈鱼骨状，凝固缓慢时， Fe 相呈长针状。 试样 P-V 曲线数据表明，裂纹更容易在长针状富铁相试样中扩展，说明
危害性更大。 设计齿轮箱铸造工艺时，关键区域应尽量采取激冷措施，降低铁元素的危害，提升齿轮箱的安全系数。
In order to improve the reliability of high-speed train gearbox, the morphology and composition of
micro-inclusions in the material of high-speed train gearbox were studied by metallography and EDS analysis. The results
show that the microcosmic inclusions are mainly Fe-rich phases. Magmasoft software is used to simulate the casting process
of gearbox, and it is found that the Fe phase formed is fishbone shape when the solidification is rapid, while the Fe phase
is long needle shape when the solidification is slow. The P-V curve data of the samples show that the crack is more likely
to propagate in the long acicular iron-rich phase samples, indicating that the damage is greater. When designing the foundry
process of the gearbox, drastic cooling measures should be taken in the key areas to reduce the harm of iron and improve
the safety factor of the gearbox.