Aug 01,2002·To investigate the effect of nitriding layer on both fatigue crack initiation and fatigue life,turbine rotor steel (lCr-IMo-0.25V steel) specimens were nitrided by the nitemper method and then put to a rotary bending fatigue test at room and elevated temperatures.In nitriding,temperature and time were controlled to obtain a different nitrided thickness.Cited by 10Publish Year 2002Author Chang-Min Suh,Byung-Won Hwang,Ri Ichi Murakamimaterials The Effect of Plasma Nitriding on the Fatigue Plasma nitriding resulted in an increase in low-cycle fatigue strength,whereas at high cycles of 200 MPa,both conditions exhibited similar behaviors.
and lugh compressive residual stress in the surface layer.which are very effective in improving fatigue strength of materials.Nitriding is one of such surface treatments and there have been many studies on the fatigue behaviour of nitrided materials [l-71,in which subsurface crack initiation was obsemd.Cited by 1Publish Year 2008Author Jonas Vilys,Valdas KvedarasEffect of nitriding on low-cycle fatigue properties Jan 01,1997·In the present study the low-cycle fatigue behaviour of gas-nitrided steel (42CrMo4 ENt0083) is con- sidered.The nitriding treatment was carried out in two phases,characterized by different temperatures,durations and ammonium dissociation degrees.The temperature and duration strongly influence the hard- ness and the depth of the external case.Cited by 1Publish Year 2017Author Mohamed Ali Terres,Lotfi Ammari,Abdelkarim ChérifOn the Fatigue Crack Growth Behavior of a Nitrided and In this paper the fatigue crack growth properties of a nitrided shot-peened steel is dealt with different peening intensities were considered and the resulting residual stresses measured by means of an X-ray diffractometer.Rotating bending fatigue tests were executed on specimens with a blind micro-hole,acting as a pre-existent crack.The results allowed determining the threshold of
Prior studies have noted that gas nitriding has a considerable effect for wear resistance.The aim of this paper is to study the influence of gas nitriding time (12,24,36 and 48 h) in the wear behaviour of 42CrMo4 steel.It has been assessed by micro hardness,pin-on-disc tribosystem,and SEM through the nitrided layer for each nitriding time.Cited by 3Publish Year 2013Author U.N.Puntambekar,G.S.Grewal,P.B.Joshi,P.SampathkumaranCyclic deformation fatigue behaviour of Ti6Al4V The data obtained from the fatigue tests (Tab.I) show a low cycle fatigue behaviour for tests carried out with deformation amplitudes of ±610-3 and ±710-3,whilst tests conducted with an amplitude control of ±510-3 show a longer fatigue life.Differ-ences between nitrided and non-treated samples are also evident.A comparison of the Cited by 3Publish Year 2017Author Mohamed Ali Terres,Rafik Bechouel,Salem Ben MohamedLow Cycle Fatigue Behaviour of Nitrided Layer of22 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%.
Terres,M.A.,Bechouel,R.and BenMohamed,S.(2017) Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 Steel.International Journal of Materials Science and Cited by 55Publish Year 1997Author M Guagliano,L VerganiLow cycle fatigue behavior of Ti6Al4V thermochemically Low cycle fatigue behavior in air of Ti6Al4V alloy has been studied.Results show a reduction of low cycle fatigue life up to 10% compared to the not-treated material.Studies suggest it is not related to the titanium nitride surface layer,but to microstructural changes caused by the high temperature treatment.Cited by 5Publish Year 2019Author Michele C.B.de Castro,Antônio A.Couto,Gisele F.C.Almeida,Marcos Massi,Nelson B.de Lima,ArArticle Fatigueoxidation interaction models for life Abstract This contribution deals with the life prediction of the virgin and nitrided hot-working tool steels X38CrMoV5 (AISI H11,47 HRC) under Transient Thermomechanical (TMF) loading.Isothermal Low Cycle Fatigue (LCF) and thermomechanical (TMF) behaviour are investigated at different temperatures and various frequencies.
Lowcycle fatigue properties and cyclic behaviors of two pure Cu samples skinned with different volume fractions of gradient nanograined (GNG) layer are investigated under total strainamplitude..Cited by 9Publish Year 2001Author D.Rodríguez,J.M.Manero,F.J.Gil,J.A.PlanellInfluence of ion nitriding on fatigue strength of low ·Plasma nitriding resulted in an increase in low cycle fatigue strength,whereas at high cycles,both conditions exhibit similar behavior.The fracture surface of the fatigue tested specimens Corrosion fatigue behaviour and fracture mechanisms in Rotary-bending fatigue tests of Ti-6Al-4V alloy at very high-cycle regime were performed in air and 3.5% NaCl solution,respectively.The S-N curves exhibited the characteristic of horizontal
Thus,plasma nitriding (without compound layer as well as plasma nitriding with compound layer lower than 10 m) increases fatigue life by delaying the onset of fatigue crack nucleation and also possibly the fatigue crack growth rate at least through the nitrided layer.The difference in the fatigue strength of compound layer Effect of Volume Fraction of Gradient Nanograined Layer on Jul 16,2019·Effect of Volume Fraction of Gradient Nanograined Layer on LowCycle Fatigue Behavior of Cu Li-Jun Jing Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,110016 P.R.ChinaEffect of Warm Laser Shock Peening on the Low-Cycle Mar 01,2021·By conducting tensiontension low-cycle fatigue tests on three groups of specimens,this paper determined the mechanism and effect of warm laser shock peening (WLSP) on the fatigue performance of DD6 nickel-based single-crystal superalloy.The WLSP treatment induced ripples at the specimen surface,residual stress fields,and dislocation structures in the near-surface layers.
Mar 01,2003·With the Uddeholm self-restricted method,the effect of compound layer of plasma nitriding on thermal fatigue behavior of 4Cr5MoSiVl steel was studied by the way of adding Ar during plasma nitriding to remove the compound layer.The results show that the compound layer of plasma nitriding can delay the nucleation of heat cracks and hold back the propagation of heat cracks fromFRACTOGRAPHICALLY-AIDED ANALYSIS OF FISH-EYEcycle and very high cycle fatigue behaviour of specimens without any surface hardening layer.Key words sh-eye,striations,fractography,nitrided steel 1.Introduction Case hardening processes,such as nitriding,induction hardening,carburization or shot peeningLOW CYCLE AND HIGH CYCLE FATIGUE STRENGTH OFcycle fatigue in near surface layer at the interface between basic metal and nitrided layer.Since the initiation of surface cracks in nitrided layer is fast,the durability of nitrided specimens at low cycle fatigue often is lower than durability of specimens not processed by nitriding .In the work  it
The low-cycle fatigue test of cylindrical specimens was carried out in the wide range of temperatures from 20 °C to 750 °C under strain control (fixed strain range) and different asymmetry ratios.Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 Jan 01,2017·The nitrided layers are relatively sensitive to the overloads ( / 2 850MPa); they become subject to brittle fracture in fatigue by the appearance of several cracks in the white layer supported by the compressive residual stress relaxation.Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 Low Cycle Fatigue Behaviour of Nitrided Layer of 42CrMo4 Steel < Previous Article.Next Article > International Journal of Materials Science and Applications Volume 6,Issue 1,January 2017,Pages 18-27 Received Aug.12,2016; Accepted Aug.25,2016; Published Jan.4,2017.Views Downloads .
At low-stress levels,the behavior of nitrided and non-nitrided conditions were similar.Increased fatigue life of the plasma nitrided specimens in tests at higher stresses can be attributed to compressive residual stress in the nitride layers and in the nitrogen diffusion zone,thereby inhibiting crack nucleation at the alloy surface.The Effect of Plasma Nitriding on the Fatigue Behavior of nitrided alloy revealed the following matrix phases ,,-Ti2N,and -TiN.A nitrogen diffusion layer was formed between the substrate and the titanium nitrides.Plasma nitriding resulted in an increase in low-cycle fatigue strength,whereas at high cycles of 200 MPa,both conditions exhibited similar behaviors.