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首页> 外文期刊>International journal of structural integrity >Effect of substrate structure on properties of nitrided layers formed on pure iron
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Effect of substrate structure on properties of nitrided layers formed on pure iron

机译：基材结构对纯铁上氮化层性能的影响

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Purpose - This paper aims to investigate the structure and scratch resistance properties of gas nitrided pure iron samples. Design/methodology/approach - The effects of material strain hardening and amount of grain boundaries exposed on nitriding surface were evaluated by cold rolling the starting samples to different reduction levels before gas nitriding. Findings - The study finds that nitriding without any prior cold rolling produced a comparatively wide compound layer with a large fraction of porous zone featuring low scratch hardness values but no evidence of damage. On the contrary, cold rolling before nitriding led to a more irregular and thinner compound layer with reduced amount of porous zone and much finer nitrides in the diffusion zone. Scratch hardness was increased but failure mechanism changed by generation of conformal cracks within the track groove and the appearance of discontinuous spallation at high loads. Originality/value - One of the issues of great industrial importance concerning nitriding of steels is the need to predict the extent of the nitrided layer in products showing small variations in microstructure or in extent of cold working due to complex manufacturing cycles. Despite the practical importance, relatively little information is available in literature about these issues. The present paper is therefore aimed at investigating the structure and mechanical properties of pure iron samples, gas nitrided with different amounts of cold working and microstructural conditions.
机译：目的-本文旨在研究气体氮化纯铁样品的结构和耐刮擦性能。设计/方法/方法-通过在气体氮化之前将初始样品冷轧至不同的还原水平，评估材料应变硬化和渗氮表面暴露的晶界数量的影响。发现-研究发现，不进行任何预先冷轧就可以进行氮化处理，形成相对较宽的复合层，并具有很大的多孔区域，具有低的划痕硬度值，但没有损坏的迹象。相反，氮化前的冷轧导致复合层更不规则，更薄，多孔区的数量减少，扩散区的氮化物更细。划痕硬度增加了，但由于在履带槽内产生的共形裂纹以及在高载荷下出现了不连续的剥落，破坏机理发生了变化。原创性/价值-与钢的氮化有关的重要工业问题之一是需要预测产品中的氮化层程度，这些产品由于复杂的制造周期而导致微观结构变化很小或冷加工程度较小。尽管具有实际重要性，但文献中关于这些问题的信息很少。因此，本论文旨在研究纯铁样品的结构和力学性能，这些样品在不同量的冷加工和显微组织条件下被氮化。

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