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首页> 外文期刊>Journal of Materials Engineering and Performance >Reducing the Surface Degradation of Aluminum Extrusion Dies During Preheating
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Reducing the Surface Degradation of Aluminum Extrusion Dies During Preheating

机译：减少预热过程中铝挤压模的表面降解

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摘要

Aluminum extrusion dies are usually made from H13 steel that is ferritically nitrocarburized to minimize wear and pick-up. Before being placed in the extrusion press, the dies are preheated to minimize thermal shock at the start of the extrusion cycle. During the preheating time, the nitro-carburized layer oxidizes. Some of this layer can break away during extrusion leaving marks on the product. Although inerting the preheat furnaces with nitrogen has been found to reduce the oxidation, it does not solve the problem completely. Experiments have shown that a small addition of ammonia to the preheating protective atmosphere could eliminate oxidation and prevent nitrogen loss from the surface nitride layer.
机译：铝挤压模具通常由H13钢制成，并经过铁碳氮共渗处理，以最大程度地减少磨损和拾取。在放入挤压机之前，先对模具进行预热，以最大程度减少挤压循环开始时的热冲击。在预热期间，硝基渗碳层被氧化。在挤出过程中，该层中的一些层可能会破裂，从而在产品上留下痕迹。尽管已经发现用氮气对预热炉进行惰化可以减少氧化，但是并不能完全解决问题。实验表明，在预热保护气氛中少量添加氨可以消除氧化并防止氮从表面氮化物层流失。

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