Experimental Study Regarding the Possibility of Blocking the Diffusion of Sulfur at Casting-Mold Interface in Ductile Iron Castings

D. Anca, I. Stan, M. Chişamera, I. Riposan, S. Stan
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Abstract

The main objective of this work is to investigate the mechanism of sulfur diffusion from the mold (sand resin P-toluol sulfonic acid mold, sulfur-containing acid) in liquid cast iron in order to limit the graphite degeneration in the surface layer of iron castings. A pyramid trunk with square section samples was cast. On the opposite side of the feed canal of the samples, steel sheets with different thicknesses (0.5, 1, and 3 mm) were inserted with the intention of blocking the diffusion of sulfur from the mold into the cast sample during solidification. The structure evaluation (graphite and matrix) in the surface layer and the casting body was recorded. The experimental results revealed that by blocking the direct diffusion of sulfur at the mold-casting interface, a decrease of the demodified layer thickness (for 0.5 mm steel sheet thickness) is obtained until its disappearance (for steel sheet thicknesses of more than 1 mm). The paper contains data that may be useful in elucidating the mechanism of graphite degeneration in the superficial layer of ductile iron castings. Based on the obtained results, we recommend using such barriers on the metal-mold interface, which are able to limit sulfur diffusion from the mold/core materials into the iron castings, in order to limit or even cease graphite degeneration in the Mg-treated surface iron casting layer. The paper presents additional data related to the interaction of sulfur at the ductile iron casting-mold interface previously analyzed.
阻止球墨铸铁件铸模界面硫扩散可能性的实验研究
本工作的主要目的是研究硫在铸铁液中从模具(砂树脂对甲苯磺酸模具,含硫酸)中扩散的机理,以限制铸铁件表层石墨的退化。浇铸了一个方形截面的金字塔形躯干。在样品进料通道的另一侧,插入不同厚度(0.5、1和3mm)的钢板,目的是阻止凝固过程中硫从模具扩散到铸样中。记录了表面层和铸体的组织评价(石墨和基体)。实验结果表明,通过阻断硫在铸型界面的直接扩散,可以使脱晶层厚度(对于0.5 mm厚的钢板)减小,直到脱晶层厚度消失(对于厚度大于1 mm的钢板)。本文所包含的数据可能有助于阐明球墨铸铁铸件表层石墨退化的机理。基于所获得的结果,我们建议在金属-模具界面上使用这种屏障,它能够限制硫从模具/芯材料扩散到铸铁件中,以限制甚至停止mg处理的表面铸铁层中的石墨退化。本文提供了先前分析过的有关球墨铸铁铸模界面处硫相互作用的附加数据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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