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首页> 外文期刊>Journal of Materials Research >Crack initiation in the very high cycle fatigue regime of nitrided 42CrMo4 steel
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Crack initiation in the very high cycle fatigue regime of nitrided 42CrMo4 steel

机译：氮化42CrMo4钢的超高周疲劳裂纹萌生。

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摘要

Surface treatments such as shot peening, deep rolling, or nitriding are known to be very effective for the protection of a surface against fatigue crack initiation, due to surface hardening and residual compressive stresses introduced below the surface. Thus, crack initiation of cyclically loaded materials occurs predominantly at internal nonmetallic inclusions (NMIs). Two different plasma-nitriding treatments were performed on a quenched and tempered 42CrMo4 cast steel. Ultrasonic fatigue tests were performed up to 10~9 cycles. Resonant frequency and the nonlinearity parameter were recorded in situ during the fatigue tests. Fractographic analyses were performed by means of scanning electron microscopy in combination with energy-dispersive X-ray spectroscopy. The results showed that nitriding, as expected, led to improvements in both fatigue life and rates of internal crack initiation at NMIs. However, the analysis of in situ parameters revealed that internal crack initiation occurred at stress amplitude levels well below the failure stress amplitude even for repeated loading until the run-out limit of 10~9 cycles.
机译：由于表面硬化和在表面之下引入的残余压应力，已知诸如喷丸处理，深轧或氮化的表面处理对于保护表面免受疲劳裂纹引发非常有效。因此，循环加载材料的裂纹萌生主要发生在内部非金属夹杂物（NMI）处。在经过淬火和回火的42CrMo4铸钢上进行了两种不同的等离子体氮化处理。超声波疲劳测试进行了10〜9个周期。在疲劳测试过程中，就地记录了共振频率和非线性参数。通过扫描电子显微镜结合能量色散X射线光谱法进行分形分析。结果表明，如预期的那样，氮化可改善NMI的疲劳寿命和内部裂纹萌生率。然而，对原位参数的分析表明，内部裂纹萌生发生在应力振幅水平远低于破坏应力振幅的情况下，即使是反复加载直至跳动极限为10〜9个循环。

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  • 来源
    《Journal of Materials Research》 |2017年第23期|4305-4316|共12页
  • 作者

    Anja Weidner; Tim Lippmann; Horst Biermann;

  • 作者单位

    Institute of Materials Engineering, Technische Universitaet Bergakademie Freiberg, Freiberg 09599, Germany;

    Institute of Materials Engineering, Technische Universitaet Bergakademie Freiberg, Freiberg 09599, Germany;

    Institute of Materials Engineering, Technische Universitaet Bergakademie Freiberg, Freiberg 09599, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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