Estimation of residual stress relaxation in low alloy steel with different hardness during fatigue by in situ X-ray measurement

Hayama:, Motoaki; Kikuchi, Shoichi; Tsukahara, Masahiro; Misaka, Yoshitaka; Komotori, Jun

doi:10.1016/j.ijfatigue.2023.107989

Cited by 16 publications

(2 citation statements)

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“…The residual compressive stress can counteract the tensile stress when the parts are used, so residual compressive stress is considered beneficial to the fatigue strength of the product [19,23]. To meet the needs of industrial use, the surface residual stress specifications of the hardened zone and heat-affected zone must be set to −400 MPa which is set as the compressive stress influence range.…”

Section: Hardnessmentioning

confidence: 99%

“…Y. Hu [17] and J. W. Gao [18] studied the effect of induction quenching on the fatigue life, and showed that the remaining life of a damaged part with residual compressive stress is more than three times that of a part without residual compressive stress. M. Hayama [19] studied induction hardening on low alloy steel to obtain different hardening depths and hardness. Their results show that the stability of the compressive residual stress depends on hardness and that a thicker hardened layer will improve the fatigue strength.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Different Microstructures on Surface Residual Stress of Induction-Hardened Bearing Steel

Lu,

Chiu

2024

Metals

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JIS SUJ2 steel is most widely used in bearing steel. The advantages are good hardenability, excellent fatigue, wear resistance and comprehensive mechanical properties. The wear resistance and fatigue resistance of this steel are attracting more attention, and the residual stress state and its distribution on the surface of the heat affected zone are critical factors affecting the fatigue life and wear resistance of the parts. In this study, SUJ2 is used as a material by which to study the surface residual stress and retained austenite distribution of induction-hardened steel. Quenching and tempering treatments were used to obtain different microstructures and an induction method was used to re-quench the case region. After the heat treatment, the residual stress and retained austenite volume on the surface were analyzed by X-ray diffraction and analyses of the microstructure and the hardness were also conducted. The results show that the microstructure after heat treatment contains unsolved carbides, tempered martensite and retained austenite. In the induction-hardened area, the residual stress is all compressive, and the values are more than −750 MPa. In conclusion, the microstructures of the specimens before induction hardening have a significant impact on the effective case depth for the same output power condition and the surface residual stress changes from a tensile to a compressive state. In the induction-hardened area, the maximum of the residual compressive stress was increased as the austenitized temperature of quenching increased.

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Section: Hardnessmentioning

confidence: 99%