Abstract:In this paper, ultrasonic surface rolling processing (USRP) was used to strengthen GCr15-bearing steel. A finite element three-dimensional model of USRP was established to analyze the residual compressive stress and equivalent plastic strain distribution on the bearing steel surface. The microstructure, hardness, surface roughness, and corrosion resistance before and after USRP treatment were characterized by SEM, EBSD, X-ray diffraction (XRD), and electrochemical techniques. Results indicated that USRP treatm… Show more
“…Besides, high-purity bearing steel is developed [18,19]. The process of low alkaline slag refining combined with vacuum carbon deoxidation can achieve TiN inclusion control and improve the cleanliness of GCr15 bearing steel [20], and methods such as ultrasonic shot peening [21][22][23] and ultrasonic rolling [24] are used to form gradient nanostructured surface layers on bearing steel, which can effectively improve the surface hardness and wear resistance of the steel, and also refine the lath martensite to obtain better mechanical properties. Studies have also been carried out on oxides, sulphides and other non-metallic inclusions in bearing steel [25], as these inclusions can act as stress sources leading to cleavage cracking and significantly affect mechanical properties [26].…”
The effect of rare earth Y on the microstructure and properties of high-carbon chromium bearing steel in different heat treatment processes has been studied. The microstructure and mechanical properties of the bearing steel under hot rolled, annealed and quenched and tempered conditions were compared and analysed, focusing on the effect of inclusions on fatigue performance. The addition of rare earth Y improves the microstructure, Vickers hardness, tensile strength, impact toughness and fatigue properties of bearing steel. The results show that rare earth Y can refine and spheroidise cementite, make the distribution of cementite more uniform, enhance the strengthening effect of the second phase and reduce the stress concentration caused by the shape of cementite. At the same time, the formation of network cementite is inhibited and the harm to grain boundary is reduced. It also has a refining effect on the grain, and the refined grain can achieve better mechanical properties. In addition, by modifying the oxides and sulphides in the steel, the properties of the steel are also improved, particularly in the quenched and tempered state.
“…Besides, high-purity bearing steel is developed [18,19]. The process of low alkaline slag refining combined with vacuum carbon deoxidation can achieve TiN inclusion control and improve the cleanliness of GCr15 bearing steel [20], and methods such as ultrasonic shot peening [21][22][23] and ultrasonic rolling [24] are used to form gradient nanostructured surface layers on bearing steel, which can effectively improve the surface hardness and wear resistance of the steel, and also refine the lath martensite to obtain better mechanical properties. Studies have also been carried out on oxides, sulphides and other non-metallic inclusions in bearing steel [25], as these inclusions can act as stress sources leading to cleavage cracking and significantly affect mechanical properties [26].…”
The effect of rare earth Y on the microstructure and properties of high-carbon chromium bearing steel in different heat treatment processes has been studied. The microstructure and mechanical properties of the bearing steel under hot rolled, annealed and quenched and tempered conditions were compared and analysed, focusing on the effect of inclusions on fatigue performance. The addition of rare earth Y improves the microstructure, Vickers hardness, tensile strength, impact toughness and fatigue properties of bearing steel. The results show that rare earth Y can refine and spheroidise cementite, make the distribution of cementite more uniform, enhance the strengthening effect of the second phase and reduce the stress concentration caused by the shape of cementite. At the same time, the formation of network cementite is inhibited and the harm to grain boundary is reduced. It also has a refining effect on the grain, and the refined grain can achieve better mechanical properties. In addition, by modifying the oxides and sulphides in the steel, the properties of the steel are also improved, particularly in the quenched and tempered state.
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