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Chengbin Shi,Xin Zheng,Zhanbing Yang,Peng Lan,Jing Li,Fang Jiang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
The microstructure and primary carbides in the steel billets produced by an industrial-scale electroslag rapid remelting(ESRR) at different melting rates were studied. The amount and size of primary carbides MC and M2Cat the center of theremelted ingots is larger than that at the mid-radius of the remelted ingots. The amount of primary carbides and secondarydendrite arm spacing of the ingot increase with the increase in the melting rates of ESRR, caused by the increase inthe local solidification time. The microsegregation of Mo in the remelted ingots after annealing is most serious among thecarbide-forming elements. The microsegregation of Mo and Cr increases linearly with increasing the melting rate, and themicrosegregation of V keeps nearly constant with further increasing the melting rate from 400 to 500 kg/h. Increasing themelting rate of ESRR do not change the types of primary carbides until 500 kg/h, at which another type of primary carbideM7C3is formed. The amount of the primary carbides and the microsegregation degree of Mo, V and Cr in the ESRR billetsat the melting rate of 400 kg/h is nearly same as that produced by same-scale conventional ESR.
Vitus Mwinteribo Tabie,Xiaodong Shi,Jianwei Li,Chengbin Cai,Xiaojing Xu 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.11
In the present study, tribological properties of Ti–4Si–xZr–yY2O3/5TiO2 were investigated. Four composites; Ti–4Si/5TiO2, Ti–4Si–1.3Zr/5TiO2, Ti–4Si–0.3Y2O3/5TiO2 and Ti–4Si–1.3Zr–0.3Y2O3/5TiO2 were fabricated by high-energy milling and cold pressing method. The composites showed enhanced wear and friction resistance against Si3N4 spheres counterface. The hardness and wear resistance of the composite increased with the addition of rare earth and Zirconium. Ti–4Si–1.3Zr–0.3Y2O3/5TiO2 composite has the smallest wear scar (222 μm) showing good wear resistance. Fatigue wear, supplemented by abrasive, oxidative and adhesive wears were identified as the predominant wear mechanisms. The study also found that rare earth Y2O3 can significantly improve the wear resistance of composites as it reduces the friction coefficient of Ti–4Si–1.3Zr/5TiO2 composite by about 25%.