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Stress and crack propagation in the surface layer of carburized stable austenitic alloys during cooling

机译：冷却过程中渗碳稳定奥氏体合金表面层的应力和裂纹繁殖

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摘要

While operating in furnaces for thermal-chemical treatment, the furnace equipment cast from stable austenitic steel is exposed to many unfavourable factors that contribute to the formation of cracks and deformations, ultimately resulting in withdrawal of this equipment from further use. This study discusses the issue of microstresses formation in the carburized, surface layer of cast steel caused, during temperature changes, by different coefficients of thermal expansion of the structural constituents - carbides and austenitic matrix, of this steel and impact of the stresses on the development of cracks running from the surface to the core of the material. To study this problem a model of carbides network at the austenite grain boundary, for the carburized Fe-Ni-Cr alloy, with an oxides layer on its surface has been developed. It was used in the simulation analysis of the influence of carbides network depth and oxides layer thickness on stresses generated on the casts surface and in the subsurface zone during rapid cooling.
机译：在用于热化学处理的熔炉中，从稳定的奥氏体钢铸造的炉子设备暴露于许多不利因素，这些因素有助于形成裂缝和变形，最终导致该设备从进一步使用中撤离。本研究讨论了在渗碳，表面层在铸钢中形成的微观结构，在温度变化期间，通过结构成分 - 碳化物和奥氏体基质的不同热膨胀系数，这种钢和应力对发展的影响从表面到材料的核心运行的裂缝。为了研究该问题，已经开发出渗碳Fe-Ni-Cr合金的奥氏体晶界的碳化物网络模型，其表面上具有氧化物层。它用于模拟分析碳化物网络深度和氧化物层厚度对在快速冷却期间在铸造表面和地下区域产生的应力的影响。

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