High-Cycle Fatigue Properties of Ferritic-Pearlitic Medium-Carbon Forging Steels with Smooth and Notched Specimens

Zhao, Sixin; Yu, Dajiang; Wang, Hui

doi:10.1007/s11665-021-05533-6

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…Medium-carbon sulfur-containing steel has been widely used for manufacturing shafts, gears, springs, bearings, etc., products because of its high strength, good plasticity and toughness, high fatigue resistance, and machinability properties. [1][2][3][4] However, the surface quality defects of sulfur-containing steel still often occur during bloom continuous casting, especially the surface and subsurface cracks. [4][5][6] Generally, it is suggested that cracks in sulfur-containing steel are initiated by MnS inclusions and ferrite.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4] However, the surface quality defects of sulfur-containing steel still often occur during bloom continuous casting, especially the surface and subsurface cracks. [4][5][6] Generally, it is suggested that cracks in sulfur-containing steel are initiated by MnS inclusions and ferrite. [7][8][9][10][11][12][13][14] Thus, quality improvements especially the controlment of sulfides in sulfur-containing steels are necessary to ensure the elevated needs of consumer expectations.…”

Section: Introductionmentioning

confidence: 99%

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Precipitation Characteristic of Sulfide in Medium‐Carbon Sulfur‐Containing Steel

Wang

et al. 2023

steel research int.

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Herein, the precipitation characteristic of sulfide is investigated by confocal laser scanning microscopy for a typical medium‐carbon sulfur‐containing 42CrMo steel under different cooling rates (100, 200, 600 °C min−1) and sulfur contents (0.0018 and 0.0249 wt%). Thermodynamic calculations show that increasing sulfur content can enlarge the liquid–solid‐phase zone and enhance the initial precipitation temperature of MnS in 42CrMo steel. Phase diagram of Mn–Mo–S demonstrates that the sulfides contain Mn, Mo, and S elements can be formed. The experimental results indicate that with an increase of the sulfur content from 0.0018 to 0.0249 wt%, more (Mn, Mo)S sulfides are formed in the steel due to the significant enhancement of supersaturation. Moreover, it is revealed that the average size of (Mn, Mo)S inclusions decreases from 16.11 to 3.55 μm when the cooling rate increases from 100 to 600 °C min−1. The typical of large‐size rodlike (Mn, Mo)S inclusions is observed in a low cooling rates of 100–200 °C min−1. As the cooling rate increases to 600 °C min−1, smaller globular (Mn, Mo)S inclusions with an average size of 3.55 μm are appeared which can act as a core to promote the ferrite formation.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Precipitation Characteristic of Sulfide in Medium‐Carbon Sulfur‐Containing Steel

Wang

et al. 2023

steel research int.

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“…Xin et al [ 4 , 5 ] adopted the Walker equation to predict the fatigue crack propagation rate of S355 and S690 grade steels at room temperature. Zhao et al [ 6 ] studied the high cycle fatigue performance of the ferritic-pearlitic medium-carbon forging steels by rotating bending fatigue tests. Soyama et al [ 7 ] studied the high cycle fatigue properties of the stainless-steel samples by a displacement controlled plane bending fatigue test.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of Combined High and Low Cycle Fatigue Performance of Low Alloy Steel and Engineering Application

Tang

Zheng

et al. 2021

Materials

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The fatigue behaviors of metals are different under different in-service environment and loading conditions. This study was devoted to investigating the combined effects of high and low cycle fatigue loads on the performance of the low alloy steel Q345. Three kinds of experiments were carried out, including the pure high cycle fatigue (HCF) tests, the pure low cycle fatigue (LCF) tests, and the combined high and low cycle fatigue (HLCF) tests. The prediction formulae were proposed for the combined high and low cycle fatigue failure. Scanning electron microscopy (SEM) and stereo microscope were used to analyze the microstructure and fracture morphology due to different fatigue loads. Case study on the combined high and low cycle fatigue damage of a steel arch bridge was carried out based on the FE method and the proposed formula. The results show that the LCF life decreases evidently due to the prior HCF damages. The HLCF fracture surface is relatively flat near the crack initiation side, and rugged at the other half part. The fatigue damages at the bridge joints increase significantly with consideration of the pre-fatigue damages caused by traffic load. In the 100th anniversary of service, the fatigue damage index without considering the HCF pre-damage is only about 50% of the coupled damage value.

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Effect of Sulfur Content on Precipitation Behavior of Dendrite Sulfide Inclusion in Continuous Casted 20CrMnTi Gear Steel

Zheng,

Gao,

Zhang

2024

steel research int.

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The effect of sulfur content on sulfide inclusion and dendrite MnS in continuous casted 20CrMnTi gear steel is investigated. There are two main types of sulfides in 20CrMnTi steel: pure MnS and TiN–MnS composite inclusions. The number of TiN–MnS is higher than MnS, especially in the edge of the billet. TiN–MnS is smaller both in area and size than pure MnS. The statistical results of dendrite MnS show that the increase of S content decreases the average size of sulfides, whereas raises the number and the maximum size of sulfides. With the S content increasing, the proportion of large‐sized dendrite MnS in steel decreases, but the amount of large‐sized dendrite MnS increases, which results in the increase of number of large‐sized dendrite MnS. The average area of dendrite MnS inclusions first increased and then decreased from the edge to the center of billet, and the maximum area appeared at about 1/2 radius of the billet. Comparison with the microstructure of the two billets, the proportion of ferrite increased with the increase of S content.

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High-Cycle Fatigue Properties of Ferritic-Pearlitic Medium-Carbon Forging Steels with Smooth and Notched Specimens

Cited by 6 publications

References 25 publications

Precipitation Characteristic of Sulfide in Medium‐Carbon Sulfur‐Containing Steel

Precipitation Characteristic of Sulfide in Medium‐Carbon Sulfur‐Containing Steel

Experimental and Numerical Study of Combined High and Low Cycle Fatigue Performance of Low Alloy Steel and Engineering Application

Effect of Sulfur Content on Precipitation Behavior of Dendrite Sulfide Inclusion in Continuous Casted 20CrMnTi Gear Steel

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