Abstract null null In this work, nano precipitates in stainless maraging steel (Custom 475) were investigated using high-resolution transmission electron microscopy. In this steel, aging induces three transformation products, NiAl-B2 phase, R phase and austenite, which contribute various hardening effects dependent on the aging temperature. In the steel aged at 480 °C, precipitation of NiAl-B2 phase was the primary reaction and led to slow incremental hardening. No hardening effect was observed ...
Abstract null null The present work is aimed to investigate the influences of arc current on the microstructure evolution of the as-deposited Cr coatings for accident tolerant fuel. Cr coatings were prepared on the surface of Zr-4 alloy by multi-arc ion plating with different arc currents. Electron backscattering diffraction (EBSD) technology was employed to characterize the microstructure evolution of the as-deposited Cr coatings, including the distribution of grain boundaries, the mean grain s...
Abstract null null A novel procedure for parent austenite orientation reconstruction from ferrite maps generated by automatic crystal orientation mapping (ACOM)-transmission electron microscopy (TEM) is proposed and applied to a martensitic bearing-steel subjected to very high cycle fatigue. It enables to counteract the presence of indexing uncertainties in phase and orientation by assuming the appearance of 180°-rotation artefacts.
#1Sun Mingyan(CAEP: China Academy of Engineering Physics)H-Index: 1
#2Fan Qichao(CAEP: China Academy of Engineering Physics)H-Index: 1
Last. Shuke Huang(CAEP: China Academy of Engineering Physics)H-Index: 4
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Abstract The evolution of phase composition and microstructure such as grain size, dislocation and crystallographic texture in austenite-martensite duplex Ni47Ti44Nb9 rolled sheets during the annealing was systematically investigated. The influence of annealing temperature on shape memory effect was also examined. The strong {001} fiber texture tested in as-rolled sheets is identified as a wrong result, which is mistakenly introduced by X-ray Diffractometer, due to the interference of martensite...
Abstract null null Single layer graphene (SLG) has been selected as an additive to modify the microstructure with integration of high anisotropy and grain refinement thereby improving magnetic properties of hot-deformed (HDed) Nd-Fe-B magnets. Careful STEM and HAADF analyses reveal that a new bi-morphologically anisotropic microstructure with fine grain size has been formed in the SLG-doped magnet, giving the omission of interfacial coarse grains. As a result, the coercivity of HDed Nd-Fe-B magn...
Abstract null null Cryogenic treatment (CT) has been proved to be a critical process of the iron-based alloys. A unique series of processes including two steps of CTs are utilized for the treatment of Ferrium S53 ultra-high strength stainless steel. In the current work, the role of the secondary cryogenic treatment on the mechanical properties and corresponding microstructure of Ferrium S53 ultra-high strength stainless steel was investigated. The results indicate that, compared with the single ...
Abstract null null A rapid image segmentation and correlation-based approach to investigating the local microstructural effects on pitting corrosion susceptibility is introduced. The impact of four different microstructural features, consisting of grain orientation, proximity to grain boundaries, proximity to intermetallic particles, and local geometrically necessary dislocation (GND) density, on pitting initiation in the 5083 aluminum alloy was directly investigated using automated pit detectio...
Abstract null null Four laboratory rolling schedules were devised and produced from a thick-wall API X70 steel plate. The microstructure and crystallographic texture were characterized followed by an evaluation of the performance of the rolled steels by investigating the mechanical properties and SCC susceptibility. High pH Stress Corrosion Cracking (SCC) is a damaging form of environmental corrosion that can cause rapid failure of buried gas transmission pipelines. It is a key question to ascer...
Abstract null null A fiber laser assisted the preparation of a nitride layer on the Ti6Al4V surface in a pure nitrogen atmosphere. Through SEM, XRD, and XPS analyses, the nitride layer is found to be mainly composed of dendritic TiN phase and an interdendritic α′-Ti phase. Not only the true crystal structure of the two main phases (TiN and α′-Ti) were directly characterized using TEM, but also the mechanical properties were tested by micro-indentation and nano-indentation methods for the first t...
Abstract null null Single NbSS phase alloy (Nb-37Ti-13Cr-2Al-1Si) and two-phase NbSS/Nb5Si3 alloy (hypoeutectic composition of Nb-16Si-24Ti-2Al-2Cr) powders prepared by the plasma rotating electrode atomization technique (PREA) were spark plasma sintered (SPS), and the microstructure, fracture toughness, deformation and fracture mode of the two SPS and arc melting (AM) alloys were characterized. With a coarsened grain size, the AM and SPS single NbSS phase alloy had a small difference in fractur...