In order to study the influence of crystal structure change due to implantation dose on the hardness and wear performance of 300M high-strength steel, samples were surface modified by Cr implantation with dosages of 5.0 × 1016, 1.5 × 1017 and 3.0 × 1017 ions/cm2. X-ray diffraction method, which was already applied in studies on the microstructure of deformed and heat-treated materials, was used to study the crystal structure of the implanted steel, and the results were corrected with the hardness and wear performance. The solid solution strengthening effect and microstructure vary with increase in implantation dose. Owing to strong solid solution hardening of Cr, small average crystallite size and high dislocation density, the hardness and wear resistance of implanted steel with dose of 5.0 × 1016 ions/cm2 were found to be the highest compared with other samples. Moreover, although the crystallite size of the implanted sample with dose of 3 × 1017 ions/cm2 was similar to that of substrate and the dislocation density was lower than that of the substrate, its higher hardness and lower specific wear rate were due to the solid solution hardening and perhaps Cr clusters reinforcement.
#1Christian Greiner(KIT: Karlsruhe Institute of Technology)H-Index: 25
#2Zhilong Liu(KIT: Karlsruhe Institute of Technology)H-Index: 4
Last. Peter Gumbsch(KIT: Karlsruhe Institute of Technology)H-Index: 59
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Abstract A typical tribologically induced microstructure displays a discontinuity parallel to the surface separating the near-surface layer from the bulk. Despite its ubiquitous observation, the origin of this layer underneath the surface remains elusive. Here, we show that already after the first loading pass a localized dislocation structure is found at a depth of 100–150 nm. This structure is linked to the inhomogeneous stress field under the moving indenter, where dislocations are trapped wh...
Abstract This paper presents the results of a study on the effects of Ti ion and Ti + Cr ion implantation on the hardness and wear resistance of Cronidur 30 bearing steel. The mechanical properties of the samples implanted and nonimplanted were investigated by nanoindentation, friction and wear tests; The microstructures and phase transformations were also studied by grazing incidence X-ray diffraction (GIXRD) analysis, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy...
Last. Feng Ding(NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 5
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Abstract To evaluate the effects of implantation on fatigue performance of TC18 alloy, Cr and Zr were implanted into specimens using metal vapor vacuum arc plasma source (MEVVA) with a dose of 1 × l017 ions/cm2. The test results show that the fatigue resistance decreased after Cr implantation and Zr implantation, compared to no implanted specimen. The increase in surface roughness after implantation has been found. To analyze the effects of surface roughness produced by ion implantation, the rel...
M50 bearing steels were alternately implanted with Ti+ and N+ ions using solid and gas ion sources of implantation system, respectively. N-implantation was carried out at an energy of about 80 keV and a fluence of 2 × 1017 ions/cm2, and Ti-implantation at an energy of about 40–90 keV and a fluence of 2 × 1017 ions/cm2. The microstructures of modification layers were analyzed by grazing-incidence X-ray diffraction, auger electron spectroscopy, X-ray photoelectron spectroscopy, and transmission el...
#1Zhixin Ba(NJIT: Nanjing Institute of Technology)H-Index: 13
#2Qiangsheng Dong(NJIT: Nanjing Institute of Technology)H-Index: 5
Last. Zhangzhong Wang(NJIT: Nanjing Institute of Technology)H-Index: 17
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Abstract To enhance surface properties of biomedical Mg-based alloys, tin (Sn) ions were introduced into Mg-Gd-Zn-Zr alloy by ion implantation. An approximately 90 nm thick Sn-implanted layer was detected by X-ray photoelectron spectroscopy (XPS). After ion implantation, the corrosion resistance was enhanced as demonstrated by polarization curves and immersion tests; besides, the implanted alloy exhibited better mechanical properties.
#2T. Balu(Aditanar College of Arts and Science)H-Index: 1
The Williamson–Hall (W–H) analysis and size-strain plot method (SSP) were used to study the lattice stress, strain and crystalline size of zinc (ZnFe2O4) and manganese (MnFe2O4) ferrite nanoparticles. These nanoparticles were synthesized by chemical co-precipitation method and characterized by powder X-ray diffraction analysis (PXRD). The PXRD results revealed that the sample product was crystalline with mixed type spinel with cubic structure. The crystalline development in the ZnFe2O4 and MnFe2...
Abstract The aerospace bearings steel CSS-42L was ion implanted by carbon with implantation fluxes of 5 × 10 16 ions cm −2 . The composition, microstructure and hardness of the carbon implanted samples were characterized using X-ray photoelectron spectroscopy, Auger electron spectroscopy, X-ray diffraction, and nanoindentation tests. The corrosion and tribological properties were also evaluated in the present work. The results shown that carbon implantation produced an amorphous layer and graphi...
Last. Emerson Coy(Adam Mickiewicz University in Poznań)H-Index: 24
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In the present work, multifunctional Ti-Si-N coatings have been deposited using CAVD method with the aim of studying their chemical, physical, structural and mechanical properties. Coatings of Ti-Si-N were modified by high-intensity ion implantation using copper ions with dose D = 2 × 1017 ions/cm2 and energy E = 60 keV. The results demonstrated that ion implantation has an effect on the grain size, hardness, and Young modulus of the Ti-Si-N coating. Additionally, the effect of Cu implantation o...
Last. C. Kozak(Lublin University of Technology)H-Index: 4
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Abstract Nitrides of high-entropy alloys (TiHfZrNbVTa)N were fabricated using cathodic-vacuum-arc-vapor-deposition method. Morphology and topology of the surface of the coatings, roughness, elemental and phase composition, microstructure and mechanical properties were investigated. Dependence of deposition parameters on surface morphology and elemental composition was demonstrated. Influence of the heavy negative charged Au − ions implantation on phase structure, microstructure and hardness of n...
The design of high-strength steel has long been discussed in the field of metal structural materials. To further increase the strength of common high-strength steel and further decrease the cost for production, three direct-quench hot rolled steels were designed and fabricated. The rolling and coiling processes were set based on continuous cooling transformation curves. In addition, the effect of the coiling temperature on the tensile properties was discussed to further guide the optimization of...