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| 高硅压铸铝合金拨叉断裂原因分析 |
| Fracture Reasons of High Silicon Die Casting Aluminum Alloy Fork |
| Received:February 22, 2019 Revised:March 10, 2019 |
| DOI：10.3969/j.issn.1674-6457.2019.02.017 |
| 中文关键词: 铝合金 高硅 显微组织 |
| 英文关键词: aluminum alloy high Si content microstructure |
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| 中文摘要: |
| 目的 研究高硅压铸铝合金的金相组织对零件强度的影响。方法 采用金相显微镜和电镜对比，分析正常件和断裂件以及故障零件断口附近的组织形态。结果 在故障件中发现了大量的脆性相β-AlFeSi相，呈现出含有微裂纹的条状或块状。对于耐磨Si相，同样也观察到了对基体产生不利影响的微裂纹，这些裂纹是导致零件失效的主因。结论 采用高Si含量铝合金时，要严格控制Fe含量，过程监控脆性相的含量及形态，必要时可以采用晶粒细化剂，避免零件内部微裂纹的产生。 |
| 英文摘要: |
| The paper aims to research influences of metallographic structure of high silicon die casting aluminum alloy castings on the strength of parts. The normal and fracture parts as well as the structure near the fracture surface of the faulty parts were analyzed with metallographic microscope and electron microscope. Results showed that a large number of brittle phases beta-AlFeSi were found in the fault parts which contained strips or blocks of micro-cracks. For wear resistant Si phase, micro cracks were also observed. These micro-cracks are the main cause of part failure. Therefore, when using high Si content aluminium alloy, the content of Fe should be strictly controlled, the content and morphology of brittle phase should be monitored during the process, and grain refiner might be used when necessary to avoid the occurrence of micro-cracks in parts. |
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