Last edited by Tektilar
Sunday, October 11, 2020 | History

5 edition of Fatigue Cracking in Nitrided Steels found in the catalog.

Fatigue Cracking in Nitrided Steels

by J. M. Cowling

  • 71 Want to read
  • 26 Currently reading

Published by Taylor & Francis Group .
Written in English

    Subjects:
  • Metals technology / metallurgy,
  • Stress & fracture,
  • Engineering - General,
  • Metal Fatigue,
  • Steel,
  • Technology & Industrial Arts

  • Edition Notes

    SeriesResearch Reports in Materials Science. Series 1, Vol 3
    The Physical Object
    FormatRing-bound
    Number of Pages120
    ID Numbers
    Open LibraryOL11946980M
    ISBN 101850701121
    ISBN 109781850701125
    OCLC/WorldCa15340349

    steels as a function of the material, loading, and environmental parameters. Two methods for incorporating environmental effects into the ASME Code fatigue evaluations are presented. The influence of reactor environments on the mechanism of fatigue crack initiation in these steels . The fatigue limit of the specimen nitrided for 96 h rose 44% to MPa in exceeding the untreated specimen in this study. Keywords: Nitriding, Steel, Wear, Fatigue. 1. Introduction. The positive effects of surface treatments like nitriding on the fatigue and wear properties of structural steel have been known for several decades. Tools and.

    The very high cycle fatigue (VHCF) properties of four 18Ni maraging steels were investigated. Ultrasonic fatigue tests were performed on thin sheets with nitrided surfaces at load ratio R = Traditional maraging steel containing Ti (material A) showed crack initiation at TiN-inclusions. The elimination of .   An example of Al-free steel with V used for camshafts is OvaX steel. After 20 h of gas nitriding at o C, The OvaX steel reaches the surface hardness of HV The key concern during nitriding of stainless steels is to retain their corrosion resistance.

    Books Topics. All books. Materials Science Building Materials General Engineering Mechanical Engineering Bioscience and Medicine Manufacturing Electronics . It is well-known that rolling contact fatigue life can be increased by modifying gear surfaces. For instance, gas nitriding is a thermochemical treatment enhancing superficial hardness, and introducing compressive residual stresses but nitriding alloys can lead .


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Fatigue Cracking in Nitrided Steels by J. M. Cowling Download PDF EPUB FB2

Additional Physical Format: Online version: Cowling, J.M. Fatigue cracking in nitrided steels. Carnforth, Lancashire, England: Parthenon Press,   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 by: 6. Fatigue behavior is an important property in the technical application of steels. Carburizing and nitriding enhance the fatigue strength because the local resistance to crack initiation is increased by hardness profiles and compressive residual stresses in the heat treated : J.

Grosch. Cyclic strength of nitrided grade 20MnCr5V steel specimens (the depth of nitrided layer – mm) in transition from low cycle area of fatigue to high cycle fatigue with various probability of.

The present investigations on the influence of plasma nitriding on fatigue crack initiation in the VHCF regime on quenched and tempered cast steel 42CrMo4 can be summarized as follows: (1) The ultrasonic fatigue tests revealed the beneficial effect of the nitride layer on fatigue life.

Thus, the higher NHDs produced higher fatigue limits—as Cited by: 6. 42CrMo4 steel after ion nitriding were received (Fig.

1, b) [12]. Presence of yield plateau for nitrided steels is con-nected with the fact that cracking of nitrided layer occurs practically at constant stress. 04 8 12 3. Fatigue strength of nitrided steelsNitriding 14 h At present nitriding for increasing fatigue.

S-N curves for direct stress fatigue have been established for a ‘Nitralloy’ type En 41B steel in the un-nitrided condition, and after nitriding at °C for 1,2, and 24 h. Failure Analysis of Heat Treated Steel Components L.C.F. Canale R.A.

Mesquita G.E. Totten ASM International Materials Park, Ohio Nitriding is performed at temperatures in the range – °C, i.e., below the α–γ equilibrium temperature of the material. These materials are machined before being nitrided, usually in the heat-treated state. The range of applications for nitriding steels is similar to that of case-hardening steels.

Stress Corrosion Cracking Corrosion in Atmospheres this Stainless Steel Blue Book Carpenter requests your feedback, technical questions, and Mechanical Properties—along with alloy strength, consider hardness, fatigue, impact and stress-rupture properties.

steels and the analysis of basic factors influence on the regularity of fatigue cracks initiation and propagation in nitrided steels. The results of this study have shown that independently from a method of nitriding the characteristics of high cycle fatigue of the limited durability and fatigue limit of constructional steels are improved.

In this work, an experimental-numerical evaluation of the standing contact fatigue testing of a nitrided AISI L steel was developed. The nitride layers were formed at the surface of an AISI L steel by a salt bath nitriding process at a temperature of °C for 1, 3 and 5 h of exposure time, obtaining three different layer thicknesses.

In order to investigate the influence of radical nitriding on the fatigue strength of high strength steels, rotating bending fatigue tests were carried out for a high chromium bearing steel SUJ2. The fatigue crack seems to be more easily initiated when the brittle nitrided layer (TiN or Ti 2 N), is thicker as is slightly the case with nitrided Ti–6Al–4 V ELI compared to nitrided TNTZ.

Particularly, the elastic modulus of TiN is two or more times higher than that of the matrix (Yan et al., ). Fatigue of the nitrided steel is a competition between a surface crack growing in a compressive residual stress field and an internal crack or ‘fish-eye’ crack growing in vacuum.

Fatigue life. Fatigue behavior is an important property in the technical application of steels. Carburizing and nitriding enhance the fatigue strength because the local resistance to crack initiation is.

A previous investigation reveals an improvement of thermal fatigue life of the AISI H11 and H13 hot work tool steel after different nitriding treatments.

There, thermal fatigue cracks, if present, remained localized inside the compound layer, indicating the positive effect of the diffusion layer in arresting their propagation. Control of white-layer composition and thickness enhances fatigue properties. The span of ion-nitriding applications includes conventional ammonia- gas nitriding, short-cycle nitriding in salt bath or gas, and the nitriding of stainless steels.

Ion nitriding lends itself to total process automation, ensuring repetitive metallurgical results. fatigue properties.

Typical nitrocarburising treatment times are 3 4 h at uC, compared with 24 72 h for nitriding at uC. In alloy or tool steels, the diffusion zone is also capable of very high hardnesses, owing to the heavy dispersion of alloy nitrides which form when alloy carbides interact with inward diffusing nitrogen.

14 MeC x. Characteristics of fatigue crack initiation and fatigue strength of nitrided 1Cr-MoV turbine rotor steels. Authors. C M. Suh B W. Hwang R I. Murakami. Publication Date. Keywords. fatigue, Substrate. Journal or Book Title. Ksme International Journal. Pages.

Volume. Issue. This document is currently not available here. with good wear and fatigue resistance superim-posed on a tough, low-carbon steel core. Of the various diffusion methods (Table 2), gas carburi-zation is the most widely used, followed by gas nitriding and carbonitriding.

Case hardness of carburized steels is primar. A perusal of publications regarding nitriding reveals a range of etchants that have been used. Nital, by far the most widely used etchant for steels, has been commonly used for nitrided steels. McQuaid and Ketcham used 4% nital to etch nitrided Cr-Al and Mo-Al steels and AISI/SAE in their study published in [1].Various available options for re- pairing observed cracking in steel bridges are also presented.

These options are adapted from the Manual for Repair and Retrofit of Fatigue Cracks in Steel Bridges (Dexter and Ocel ) and are proposed as a guide for the detailing of repairs and retrofits for fatigue cracks.