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首页> 外文期刊>Проблемы прочностиПроблемы прочности: на рус．укр．и анг．языках >Influence of Nitriding on the Fatigue Behavior and Fracture Micromechanisms of Nodular Cast Iron
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Influence of Nitriding on the Fatigue Behavior and Fracture Micromechanisms of Nodular Cast Iron

机译：氮化对疲劳行为的影响球墨铸铁的断裂微观结构

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摘要

Surface modification processes are increasingly used to fully exploit material potential in fatigue critical applications because fatigue strength is sensitive to surface conditions. Nitriding is extensively adopted with ferrous materials because it forms a hard and strong surface layer and a system of superficial compressive residual stresses. Fatigue, however, is strongly dependent also on defects and inhomogeneity. When nitriding is applied to nodular cast iron (NCI), the relatively thin hardened layer (about 300μm) contains graphite nodules (diameter of the order of 30μт), casting defects and a heterogeneous matrix structure. The paper presents and discusses the influence of nitriding on the fatigue response and fracture mechanisms of NCI. A ferritic NCI and a synthetic melt with different content of effective ferrite were initially gas-nitrided. Then, (i) structural analysis of nitrided layers, (ii) fatigue testing with rotating bending specimens, and (iii) fatigue fracture surface inspection were performed. Performance and scatter in fatigue performance is discussed by selective inspection of fracture surfaces and identification fracture micromechanisms. A semi-empirical model explains observed trends in test results and is used for the process optimization.
机译：表面改性处理越来越多充分利用材料的潜力因为疲劳疲劳关键应用强度敏感表面条件。氮化与亚铁广泛采用材料,因为它形成了一个艰苦的和强大的表层和肤浅的一个系统压缩残余应力。也强烈依赖缺陷和不均匀性。球墨铸铁(NCI),相对较薄硬化层(约300μm)包含石墨结节(直径的30μт),铸造缺陷和异构的矩阵结构。提出和讨论的影响氮化的疲劳反应和骨折NCI的机制。不同内容的有效铁氧体融化最初gas-nitrided。氮化层的分析,(2)疲劳测试旋转弯曲标本,和(3)疲劳断裂表面检查执行。讨论了选择性检查性能断裂表面和识别断裂微观结构。测试结果和用于观察到的趋势流程优化。

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