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3 results on '"Jinliang Pi"'

1. Corrosion properties of phase reversion induced nano/ultrafine grained AISI 304 metastable austenite stainless steel

Author

Hongyun Luo, Jinliang Pi, Jun Tang, Jingjing Guo, Kanglin Ye, and Yang Lv

Subjects
010302 applied physics, Equiaxed crystals, Austenite, Materials science, Annealing (metallurgy), Mechanical Engineering, Metallurgy, 02 engineering and technology, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Microstructure, 01 natural sciences, Corrosion, Mechanics of Materials, Martensite, 0103 physical sciences, Nano, General Materials Science, 0210 nano-technology, Polarization (electrochemistry)
Abstract

AISI 304 metastable austenite stainless steel was cold rolled under cryogenic temperature and transformed into martensite completely, after reverse transformation by annealing, bulk nano/ultrafine grained material was obtained. The material’s microstructure was observed by TEM, and the corrosion resistance was studied by polarization curve, EIS, and Mott-Schottky plot. Results showed that samples cold rolled at −120 °C had an equiaxed microstructure and displayed the best corrosion performance. The distinctive polarization curve shape indicated that its passive film had a peculiar feature, and the M-S plot showed its abnormal semiconductor character. XPS measurements are used to directly characterize the composition of passive film formed on specimens. Heterogeneous microstructures might help with the improvement on corrosion resistance of the nano/ultrafine grained stainless steel.

Published
2018
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2. Microstructural evolution and interdiffusion behavior of Mo-Si-B coating on Nb-Si based alloy

Author

Jinliang Pi, Chungen Zhou, and Wei Shao

Subjects
Microstructural evolution, Materials science, Annealing (metallurgy), 020502 materials, Mechanical Engineering, Alloy, Metals and Alloys, Analytical chemistry, Modified method, 02 engineering and technology, General Chemistry, Rate equation, engineering.material, 021001 nanoscience & nanotechnology, 0205 materials engineering, Coating, Mechanics of Materials, Cementation (metallurgy), Materials Chemistry, engineering, 0210 nano-technology, Argon atmosphere
Abstract

A Mo-Si-B coating was prepared on an Nb-Si based alloy by detonation-gun spraying of Mo followed by co-deposition of Si and B via pack cementation. The microstructural evolution and interdiffusion behavior of the coating/substrate system were investigated by annealing for different times at 1250 °C in argon atmosphere. The results show that the interdiffusion zone has a two-layer structure consisting of (Mo, X′)5Si3 (X’ = Nb, Ti, Cr, Hf) and (Nb, X)5Si3 (X = Ti, Cr, Hf), respectively. The growth of the transitional layer, which obeys a parabolic rate law, is dominated by the inward diffusion of Si from the outer layer to the substrate. The interdiffusion coefficients of Si in the transitional layers are calculated using a modified method based on the Boltzmann-Matano analysis.

Published
2018
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3. PLA2G12B Mediates Arachidonic Acid Metabolism through Activation of the NF-κB Pathway to Promote Membrane Nephropathy

Author

Linlin Fu, Jinliang Ping, Fei Guo, Jiafeng Song, Mingjun Luo, and Lijing Chen

Subjects
membranous nephropathy, podocytes, arachidonic acid metabolism, pla2g12b, nf-κb pathway, Dermatology, RL1-803, Diseases of the circulatory (Cardiovascular) system, RC666-701, Diseases of the genitourinary system. Urology, RC870-923
Abstract

Introduction: The disruption of podocyte structure and function are the main pathological mechanism of membranous nephropathy (MN). Phospholipases A2, Group XII B (PLA2G12B) was reported involved in the regulation of MN by interfering with arachidonic acid (AA) metabolism, but there is a lack of sufficient evidence. In this study, we investigated the role and molecular mechanism of PLA2G12B in MN. Methods: C57BL/6 mice were used to establish MN model to extract primary podocytes, then divided into control, model, si-phospholipases A2 receptor (PLA2R), PLA2G12B, PLA2G12B + si-PLA2R, PLA2G12B + nuclear factor kappa-B (NF-κB) inhibitor, PLA2G12B + NF-κB inhibitor + si-PLA2R groups. Hematoxylin-eosin staining and immunofluorescence were used to detect kidney histological arrangement, serum levels of cholesterol-related indices, and AA. Genes and proteins associated with metabolism and inflammatory factors were detected by quantitative real-time PCR and Western blot. Results: The results revealed that AA metabolites were activated in the MN model mice, and the expression of PLA2G12B and NF-κB pathway levels were elevated. Besides, cellular experiments demonstrated that prostaglandin I2 (PGI2), thromboxane A2 (TXA2), leukotriene B4 (LTB4), and NF-κB pathway were significantly increased in the PLA2G12B group. Also, PLA2G12B promotes apoptosis and suppresses cell activity in podocytes, and these effects could be antagonized by NF-κB inhibitors. Furthermore, with the inference of si-PLA2R, the NF-κB inhibitors’ effects were reversed. Conclusion: Promotional effects of PLA2G12B in primary MN are associated with the regulation of AA metabolism and NF-κB pathway.

Published
2023
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