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- 저자 : K. S. Bindra (검색결과 3 건)
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K. Benarji,Y. Ravi Kumar,A. N. Jinoop,C. P. Paul,K. S. Bindra 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.3
This paper reports investigation on the effect of heat-treatment on the microstructure, mechanical, tribological and corrosioncharacteristics of laser directed energy deposition (LDED) built stainless steel (SS 316) bulk structures. LDED built SS316 structures are subjected to solution treatment at 1073 K (HT1073) and 1273 K (HT1273) and reduction in ferrite phasewith heat-treatment is observed from microstructure. X-ray diffraction and microstructure shows that the austenite phaseis observed at all conditions and reducing ferrite phase intensity is noticed with an increase in heat-treatment temperature. Improvement in the plasticity retaining capacity and reduction in micro-hardness by 72.8% and 6.75% are noticed withheat-treatment, respectively. It is observed that the corrosion rate and specific wear rate increases after heat-treatment. Themaximum specific wear rate of 0.19375 × 10–4 mm3/min is observed in the HT1273 sample with wide and deep groovesnoticed on the worn out surface of heat-treated samples. The SEM images of wear track is characterized with abrasive wearmechanism for as-built sample, while heat-treated samples shows plastic deformation, followed by spalling effect. The workpaves a way to understand the effect of heat-treatment on LDED built SS 316 bulk structures.
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Electrical and magnetic properties of rare earth substituted strontium hexaferrites
Anterpreet Singh,S. Bindra Narang,Kulwant Singh Thind,O.P. Pandey,R.K. Kotnala 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.2
Samples of strontium ferrite (Sr-M) with different molar substitution concentrations of lanthanum, neodymium and samarium ions were prepared by a standard ceramic processing technique. AC conductivity, dielectric constant and dielectric loss tangent measurements were carried out in the frequency range of 20 Hz to 1MHz. The experimental results indicate that AC electrical conductivity increases with increasing frequency. The increase in AC conductivity with frequency can be explained on the basis of Koops model, whereas the dielectric constant and dielectric loss tangent variations have been explained with a Maxwell-Wagner type interfacial polarization in agreement with the Koops phenomenological theory. The effects of rare earth substitution on the magnetic properties such as the saturation magnetization moment (Ms), coercive field (Hc), remenance (Mr),and Curie temperature Tc (K) have been investigated. It is found that the values of the magnetization moment (Ms), and remenance (Mr) decrease with increasing rare earth ions substitution for all the series. The reason for the decrease may be both the magnetic dilution and spin canting, which promote reduction of superexchange interactions. The enhancement of Hc values may be due to higher magnetocrystalline anisotropy, where Fe2+ ion anisotropy on the 2a site could be dominant in all hexaferrites series.
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Tarun Bhardwaj,Mukul Shukla,Nisheeth K. Prasad,C. P. Paul,K. S. Bindra 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.7
In this study, the direct laser deposition-additive manufacturing (DLD-AM) process is employed to fabricate Ti–15Mobiomedical alloy along two build directions. The aim is to analyse the effect of induced surface topography on corrosionand in-vitro bioactivity, motivated towards ultimate reduction in post-fabrication surface modifications. The effectof surface roughness on corrosion resistance is analysed in-vitro in simulated body fluid (SBF) by electrochemical study. Owing to higher surface roughness in the vertical build samples (Ra = 52.70 ± 11.40 μm) than the horizontal build samples(Ra = 27.10 ± 4.17 μm), upto 75% higher corrosion resistance is found for horizontally built samples. The double passivebarrier layer formed in horizontal build higher surface finish samples results in lower corrosion. Further, wettability testconfirms that both the build orientations exhibit a hydrophilic surface nature, leading to improved cell attachment. SEM–EDSanalysis establishes the in-vitro apatite formation on immersion in SBF, for both build orientation samples. This study leadsto understand the role of build orientation induced surface topography for production of minimal post-surface treatmentTi–15Mo bio-implants by the DLD-AM process.
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