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microstructural developments and precipitate transformation during transient liquid-phase bonding of a duplex stainless steel

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Journal of Central South University 2013年第1期20卷 15-23页

作者：袁新建 KANG Chung-Yun College of Materials Science and Engineering Chongqing University Department of Materials Science and Engineering Pusan National University

Effect of holding time on microstructural developments and transformation of precipitates formed at the interface during transient liquid-phase bonding of a duplex stainless steel using a Ni-based amorphous insert alloy was studied. The experimental results reveal that the microstructure of the adjacent base metal varies clearly as a function of holding time. The migration of Cr and Ni elements and the → transformation seem to play relevant roles in this microstructure evolution. The scanning electron microscopy (SEM) and electron prob X-ray microanalysis (EPMA) results indicate the transformation of BN→BN and (N, Mo) boride→BN at the interface with the holding time of 60-1 800 s. N content changes with holding time increasing at locations at the interface might be a controlling factor contributing to this transformation.

关键词： transient liquid-phase bonding duplex stainless steel microstructural development precipitate transformation

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Selective Laser Melting of an Al–Fe–V–Si Alloy:microstructural Evolution and Thermal Stability

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Journal of Materials Science & Technology 2017年第4期33卷 389-396页

作者： Shao-Bo Sun Li-Jing Zheng Jin-Hui Liu Hu Zhang School of Materials Science and Engineering Beihang University Modern Manufacturing Engineering Center Heilongjiang Institute of Science and Technology

Selective laser melting was used to produce an aluminum alloy Al-8.5Fe-1.3V-1.7Si（wt%）. The effects of heat treatment on microstructure evolution and phase stability during long-term thermal exposure of the deposits were investigated. Results show that the microquasi-crystalline phase, Al12（Fe,V）3Si and AlmF e metastable phases coexisted with α-Al in the as-produced alloy. Annealing at 400 ℃ resulted in decomposition of microquasi-crystalline phase and supersaturated α-Al into Al12（Fe, V）3Si phase in the fusion zone, accompanied by the decrease in alloy hardness. The activation energy of this decomposition process was 115 k J/mol. A more homogenous microstructure was obtained after annealing at 400 °C for 60 min,which was resistant to coarsening exposed at 425 °C up to 500 h. The Al12（Fe,V）3Si and AlmF e phases were coarsened at 475 and 525℃ with increasing the exposure time. Coarsening of Al12（Fe,V）3Si phase was attributed to a combination of volume diffusion and grain boundary diffusion mechanism of Fe. Heat treatment at 600℃ resulted in accelerated microstructure coarsening and formation of large-sized equilibrium phases, which signi？cantly degraded the room temperature microhardness.

关键词： Selective laser melting Al–Fe–V–Si alloy microstructural development Thermal stability Microhardness

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Micro Structural development of in Situ Heated and Deformed Pure and Silica Gel-Doped Polycrystalline Halite Using High Energy Synchrotron Radiation

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Journal of Earth Science and Engineering 2015年第1期5卷 27-43页

作者： Caterina E. Tommaseo Department of Mineralogy Technical University of Berlin Berlin 13355 Germany

This paper presents an experimental investigation of the microstructural development upon in situ compression and heating of pure and SiO2 gel-doped （5 wt%） polycrystalline halite, with grain sizes ranging from 45 μm to 〉70 μm （cold pressed at 200 MPa and heated at 150 ℃ for one week）, using high energy synchrotron x-ray radiation. Texture development of the samples was studied at room temperature, 100, 200 and 300 ℃. At each temperature, the samples were axially compressed keeping the load constant at every -500 N step up to the maximum 2,400 N （- 48 MPa）. At the different loads and temperatures, 2D images and load/elongation curves were recorded in situ to get information about the texture development and the rheological behaviour of the potycrystalline halite samples. At high stresses, the doped halite samples show an increase in the elastic moduli and in the microstrain The results were confirmed by the single grain orientation analyses using the FABLE program, where a sharpening of the texture was observed.

关键词： Polycrystalline halite in situ experiments microstructural development silica gel.

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