The pre-hot dipping effects on the bimetal casting of nitriding steel sleeve into the Al-Si matrix
The pre-hot dipping effects on the bimetal casting of nitriding steel sleeve into the Al-Si matrix
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预热浸镀对渗氮钢套双金属铸入Al-Si基体的影响
DOI：
10.1088/1742-6596/1507/4/042009
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发表时间：
2020-04
期刊：
影响因子：
--
通讯作者：
Y Wang
中科院分区：
文献类型：
--
作者：
H Xu;B X Guo;Z Y Fan;H K Mao;Y Wang
钢铝复合材料联合收割机结合了钢的高强度、耐磨性好等优良的力学性能和铝的轻质优点，广泛应用于汽车发动机缸体、变速箱等车身结构。本文采用一种新的工艺，将合金钢缸套铸造到铝硅合金基体中，制备出了具有钢质缸套的铝合金发动机缸体。该工艺由钢的表面预处理、热浸镀熔敷和钢与铝的固液铸造三部分组成。通常，热浸镀熔体应具有比铝合金的熔点低的熔点、良好的温度抗氧化性以及与钢和铝的固溶量。考虑到这种条件和成本，本文采用Zn ′ Al及其合金，研究了热浸镀液在不同时间对钢/铝界面性能的影响。热浸镀后，钢套表面形成涂层，改善了其在铝熔体中的润湿性和钢铝界面的冶金结合效果。采用金相显微镜、扫描电镜和能谱仪分析了界面的显微组织、相组成、生长动力学和硬度分布。结果表明，采用热浸镀工艺可以获得钢/铝复合铸件的冶金结合界面。浸纯铝产生的硬脆扩散层比ZL 101产生的硬脆扩散层厚。浸纯锌后产生了3-5 μ m的致密金属间化合物层和大量的Al 3FeZnx弥散相，这种界面的结合性能优于其它两种界面。采用纯Al、ZL 101和纯Zn熔体热浸镀获得的钢铝复合铸件界面硬度分别达到563.5HV、528.3HV和632.3HV。
Steel-aluminum composite material combine the excellent mechanical properties of steel such as high strength and good wear resistance with the advantages of lightweight aluminum for widely using in automobile engine block, gearbox and other car body structures. In this paper, a new process is used to cast the alloy steel sleeve into Al-Si alloy matrix for preparing aluminum engine block with steel cylinder liner. The process consists of three parts: the surface pre-treatment of steel, the hot-dipping melt and solid-liquid casting of steel with aluminum. Generally, the hot dipping melt should have lower melting point than the melting point of aluminum alloy, good temperature oxidation resistance and amount of solid solubility both with steel and aluminum. Giving consideration of such condition and cost, Zn´ Al and its alloys are used in present paper for learning the effect of hot dip coating melts on the interface properties of steel/aluminum at different times. After hot dipping, a coating formed on the surface of the steel bushing, which improves its wettability in the aluminum melt and the metallurgical bonding effect of the steel-aluminum interface. The microstructure, phase composition, growth kinetics and hardness distribution of the interface were analyzed by metallographic microscopy, scanning electron microscopy with EDS. The results show that the metallurgical bonding interface of steel/aluminum bimetal casting can be obtained by hot dipping. Hard-brittle diffusion layer produced by dipping pure Al is thicker than that produced by ZL101. Dipping pure zinc produces a dense intermetallic layer of 3-5 um and a large amount of dispersed phase of Al3FeZnx, and the bonding performance of such interface is better than the other two. The interface hardness of steel-aluminum bimetal casting obtained by hot dipping pure Al melt, ZL101 melt and pure Zn melt can reach 563.5HV, 528.3HV and 632.3HV, respectively.
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影响因子：
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作者：
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DOI：
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