high cycle fatigue of ion nitrided 40cr steel Related introduction

  1. Cyclic deformation and fatigue behaviour of ion-nitrided steel

    The effect of the ion-nitriding process on the axial fatigue and deformation behaviour of SAE 1045 steel was investigated using smooth specimens at room temperature. Both monotonic and cyclic deformation responses of the ion-nitrided specimens are evaluated and compared with those of

  2. Crack initiation in the very high cycle fatigue regime of ...

  3. The effect of nitriding on fatigue strength of structural ...

    work [12] it is shown that ion nitriding up to the depth of 350 m of specimens from alloyed grade 42CrMo4 steel reduces durability in the area of low cycle fatigue and at the same time increases fatigue limit to 30%. Processes of microcracking on the surface of ni-trided layer at low cycle fatigue are determined by a num-

  4. Effect of ion nitriding on fatigue behaviour of AISI 4140 ...

    Effect of ion nitriding on fatigue behaviour of AISI 4140 steel. In this study, the effect of case depth on fatigue performance of AISI 4140 low alloy steel has been investigated by conducting a series of rotary bending fatigue tests at the frequency of 95 Hz, on hour glass shaped, 4 mm diameter specimens, which had been ion nitrided at 748 K for 1,high cycle fatigue of ion nitrided 40cr steel

  5. Low Cycle Fatigue Behaviour of Nitrided Layer of

    22 Mohamed Ali Terres et al.: Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 Steel Fig. 12. Tensile fracture topography of nitrided 42CrMo4 steel. 4.3. Overload Fatigue Sensitivity The lowcycle fatigue tests highlight an accommodation of material in these two states subjected to a total imposed deformations going from 0.55 to 1.6%.

  6. Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 ...

  7. Effect of the ion nitriding surface hardening process on ...

    Up to 91% improvement in fatigue strength of the steel has been attained by ion nitriding. It was determined that, the subsurface fish eye type formation is the dominant fatigue crack initiation mechanism in ion nitrided AISI 4340 steel in high cycle region and its

  8. Effect of the ion nitriding surface hardening process on ...

    Up to 91% improvement in fatigue strength of the steel has been attained by ion nitriding. It was determined that, the subsurface fish eye type formation is the dominant fatigue crack initiation mechanism in ion nitrided AISI 4340 steel in high cycle region and its origin was nonmetallic inclusions.

  9. Fatigue and fretting fatigue of ion-nitrided 34CrNiMo6

    Several researchers studied the eect of ion nitriding on fatigue behaviour [9,10]. In general, improvements of fatigue resistance were found for the stress-controlled high-cycle regime. Benecial eect of ion nitriding on fatigue was attributed to hardness increase of the surface and increase sur-face residual stress. Additional investigations are

  10. EFFECT OF HEAT TREATMENT ON THE FATIGUE

    The fatigue strength of AISI 4340 steel was increased by up to 91% by ion nitriding process [6]. The residual stress induced induction heating in the stainless steel specimens increases the high cycle fatigue

  11. Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 ...

  12. Low Cycle Fatigue Behaviour of Nitrided Layer of

    characteristics of 42CrMo4 steel but renders it more sensitive to overload in fatigue. As a result, a 0.7% total deformation imposed corresponding to a loading level of 850MPa, constitutes the limit of gain in fatigue obtained by the ion nitriding

  13. Fatigue and fretting fatigue of ion-nitrided

    amplitude increases, the fretting fatigue strength either increases [7] or reaches a constant value [8]. Several researchers studied the eect of ion nitriding on fatigue behaviour [9,10]. In general, improvements of fatigue resistance were found for the stress-controlled high-cycle regime. Benecial

  14. LOW CYCLE AND HIGH CYCLE FATIGUE STRENGTH OF

    mm the sharp bend of transition from low cycle fatigue area to high cycle fatigue appears (Fig. 1). In area of low cycle fatigue the cracks initiate on the surface of specimens and in the area of high cycle fatigue in near surface layer at the interface between basic metal and nitrided layer. Since the

  15. Effect of Plasma Nitriding Treatment on Fatigue Life of En ...

  16. EFFECT OF HEAT TREATMENT ON THE FATIGUE

    The fatigue strength of AISI 4340 steel was increased by up to 91% by ion nitriding process [6]. The residual stress induced induction heating in the stainless

  17. Very high cycle fatigue of nitrided 18Ni maraging steel ...

  18. Research on Ion Nitriding Temperature Effect on Wear ...

    nitriding temperature increased. When ion- nitriding temperature at 530 , the surface hardness of ion nitrided-layer is gotten to Max. value. But the depth of ion nitrided is increased with ion nitriding temperature. From this result, the optimum ion nitriding temperature for Cr12MoV steel is selected as 530 . 2.2. The microstructure of ionnitrided layer

  19. EFFECT OF HEAT TREATMENT ON THE FATIGUE

    fatigue life of the material with presence of compound layer upto 10µm [5]. The fatigue strength of AISI 4340 steel was increased by up to 91% by ion nitriding process [6]. The residual stress induced induction heating in the stainless steel specimens increases the high cycle fatigue lives [7]. Fatigue strength of hybrid surface modification high cycle fatigue of ion nitrided 40cr steel

  20. Influence of inclusion type on the very high cycle fatigue ...

  21. Low Cycle Fatigue Behaviour of Nitrided Layer of

    22 Mohamed Ali Terres et al.: Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 Steel Fig. 12. Tensile fracture topography of nitrided 42CrMo4 steel. 4.3. Overload Fatigue Sensitivity The lowcycle fatigue tests highlight an accommodation of material in these two states subjected to a total imposed deformations going from 0.55 to 1.6%.

  22. Fatigue Strength of Ion Nitrided Tool Steel - Scientific.Net

  23. An Introduction to Nitriding - ASM International

    The rst portion of the cycle is accomplished as a normal nitriding cycle at a temperature of about 500 °C (930 °F) with 15 to 30% dissociation of the ammonia (i.e., an atmosphere that contains 70 to 85% ammonia). This will produce the nitrogen-rich compound at the surface.

  24. Nitriding Process and Nitriding Steels IspatGuru

  25. Ion and Gas Nitriding Applied to Steel Tool for Hot

    erally used for steels operating at high temperatures and especially those subject to a high mechanical stress and/ or thermal prints such as die casting, stamping tools. Nitriding is a process applied in order to produce sur-face steel layet layer of high hardness, to increase their ser- viceability to the phenomena of wear, fatigue and corrosion.

  26. Influence of nitriding temperature on surface structural ...

    In some earlier studies [8, 9, 22], it was shown that the presence of a compound layer did not have any significant effect on high cycle fatigue strength of nitrided steel since a fatigue crack initiated under a strengthened nitrided layer. Residual stresses have a major

  27. Nitriding and Carburizing, Metlab Heat Treat

    Oct 14, 2016 · Materials that can be nitrided include low carbon steels, which will develop file hardness, alloy steels such as 4130, 4140, 4340 and Nitralloy 135M which are the most common nitriding steels and special application steels including, mold steels (P-20), air hardening tool steels (A-2 and D-2), hot work and shock steels (H-13 and S-7), high speed steels (M-2, M-4 and M-42), and stainless steels (304,

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