Fatigue characteristics of nitrided SACM 645 according to the nitriding condition and notch

Suh, Chang‐Min; Hwang, Jeongki; Son, K.S.; Jang, Hokyung

doi:10.1016/j.msea.2004.07.066

Cited by 18 publications

(13 citation statements)

References 6 publications

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“…Due to the hardening and trapping effects of the ε-phase (Fe 3 N) and γ'-phase (Fe 4 N) in the nitrided layer, hardness profiles of the diffusion layer decreased exponentially from the surface. The observed result was in agreement with Suh et al [2]. A considerable increase in the microhardness of the diffusion zone can be achieved by increasing the amount of supersaturated dissolved nitrogen (solid solution strengthening) [12].…”

Section: Microhardnesssupporting

confidence: 92%

“…The increase of fatigue limit of the 30C-GN96 specimen was 44.2% compared to the tempered martensitic substrate (30-TMS) specimen observed. Suh et al [2] reported the rotary bending fatigue characteristics of nitrided SACM 645 steel and found that the fatigue crack was initiated beneath the nitrided layer by residual compressive stress on the surface. They indicated that the crack initiation was hindered by the nitriding layer, while the finding was similar to the work done by Buchhagen and Bell [15].…”

Section: Figure 5 Mass Losses Of Specimens At Given Wear Test Conditmentioning

confidence: 99%

“…Consequently, the structural steel of those components should be always surface modified to provide these needed properties. The surfaces of these components are required to attain high hardness values to resist wear, and the inner cores still need to have high toughness strength [1,2]. Therefore, various methods, such as nitriding, carburizing, ceramic coating and thermal chemical treatments, have been devised to improve the surface mechanical properties of the components [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Gas Nitriding on the Mechanical and Corrosion Properties of SACM 645 Steel

Yeh¹,

Chiu²,

Chang³

2011

ENG

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The effects of the nitrided case produced by gas nitriding processes on the mechanical and corrosion resistance properties of the JIS SACM 645 steel were studied in this paper. JIS SACM 645 steel specimens with different substrate hardness were gas nitrided at 530?C for various nitriding durations. Nitrided specimens were characterized by means of optical and scanning electron microscopy, X-ray diffraction, glow discharge optical spectrometry, microhardness profiling, wear test, torsion mode fatigue test as well as electrochemical corrosion test in an aerated 3.5% NaCl solution. The surface hardness values of the nitrided specimens with Fe3N and Fe4N phases precipitated in the case layer were observed higher than 1000 HV0.1. Mass loss measurement of the wear test showed increases of wear resistance of the nitrided specimens, and the mass losses of the specimens were strongly influenced by nitriding durations. Electrochemical measurements showed that corrosion current density of the specimens was significantly decreased after nitriding and the corrosion potential was shifted to the noble direction as the increase of the nitriding durations. The fatigue limit of the specimen nitrided for 96 h rose 44% to 600 MPa in exceeding the untreated specimen in this study

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Section: Microhardnesssupporting

confidence: 92%

Section: Figure 5 Mass Losses Of Specimens At Given Wear Test Conditmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Gas Nitriding on the Mechanical and Corrosion Properties of SACM 645 Steel

Yeh¹,

Chiu²,

Chang³

2011

ENG

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“…The surface cracks combined with other adjacent small cracks and grow into larger crack as shown as dotted area. The cracking phenomena were commonly observed for "after SP" specimens [14][15][16][17].…”

Section: S-n Curves Of Ultrasonic Fatigue Tester (Uft 20 Khz)mentioning

confidence: 97%

VHCF Properties of A7075-T651 Al Alloy Depending on Shot Peening and Fatigue Testing Methods

Suh

Nahm

et al. 2014

Advances in Mechanical Engineering

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Fatigue characteristics of A7075-T651 aluminum material were studied with surface treatment of shot peening. The fatigue life was characterized by two fatigue testing methods, ultrasonic fatigue test (UFT, 20 kHz) and the rotary-bending fatigue test (RFT, 53 Hz). The fatigue life improvement was confirmed by rotary bending fatigue tester. However, the surface modification effects were hardly observed by UFT method. The RFT results validate that the fatigue properties of RFT show a fine congruence regardless of the test machine types. The results of hardness, compressive residual stress, fatigue strength, and mechanical properties of specimen were improved by shot peening.

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“…In previous contributions, several authors have analysed the effect of nitrocarburizing on the fatigue limit of the plain material [26][27][28][29][30][31], while only few contributions [10,24] have been devoted to investigating the effect of nitrocarburizing on the medium-high cycle fatigue regime, considering both plain and notched specimens. Moreover, the effects of the combination of salt bath nitrocarburization and post-oxidation, i.e., QPQ treatment, have been mainly analysed from the point of view of microstructure, hardness, wear and corrosion resistance [14][15][16][17][18]32], while the effects of QPQ treatment on the fatigue behaviour have been investigated in detail only for some steel categories, such as carbon steels [33][34][35], alloyed steels [36,37], tool steel [38]; and also for ductile cast iron [39].…”

Section: Introductionmentioning

confidence: 99%

Effect of Salt Bath Nitrocarburizing and Post-Oxidation on Static and Fatigue Behaviours of a Construction Steel

Campagnolo

Dabalà

Meneghetti

2019

Metals

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Several surface modification technologies are typically applied to improve the mechanical properties of the material surface of structural components subjected to severe conditions of load, wear and chemical erosion of the surface. The nitrocarburizing and post-oxidation heat treatment, also known as quench-polish-quench (QPQ), improves the fatigue, wear and corrosion resistance properties of the material, since it increases the surface hardness and generates surface compressive residual stresses. In the present contribution, the effects of the salt bath nitrocarburizing and post-oxidation heat treatment on the static and fatigue behaviours of 39NiCrMo3 construction steel have been investigated by experimentally testing plain as well as notched specimens. For comparison purposes, 39NiCrMo3 construction steel, both untreated and treated, and X5CrNiCuNb 16-4 stainless steel have been tested. First, the microstructure of the untreated and treated steel has been identified by metallographic analysis; micro-hardness measurements have been collected and residual stresses profiles have been obtained by using the X-ray diffraction technique. Then, experimental static and fatigue tests have been performed. Finally, the fracture surfaces have been analysed to locate fatigue crack nucleation sites.

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Fatigue characteristics of nitrided SACM 645 according to the nitriding condition and notch

Cited by 18 publications

References 6 publications

Effects of Gas Nitriding on the Mechanical and Corrosion Properties of SACM 645 Steel

Effects of Gas Nitriding on the Mechanical and Corrosion Properties of SACM 645 Steel

VHCF Properties of A7075-T651 Al Alloy Depending on Shot Peening and Fatigue Testing Methods

Effect of Salt Bath Nitrocarburizing and Post-Oxidation on Static and Fatigue Behaviours of a Construction Steel

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