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| 1 | Effect of sigma phase precipitation on microstructure and properties of cast ZG0Cr26Ni5Mo3Cu3 duplex stainless steel under different heat treatments显示文摘ZG0Cr26Ni5Mo3Cu3 Duplex Stainless Steel(DSS) was solution treated at 1,060 ℃ for 3 h, followed by water cooling. Tempering treatments were conducted at 720, 750 and 780 ℃, respectively, for 16 h, followed by air cooling. The microstructures of ZG0Cr26Ni5Mo3Cu3 duplex stainless steel samples treated at different tempering temperatures were observed by scanning electron microscope(SEM) and energy dispersal spectroscopy(EDS), and the phase consitutions were analyzed using X-ray diffraction(XRD). The effects of the precipitation of sigma(σ) phase on the duplex phase percentage, hardness, impact toughness and corrosion resistance of the DSS were studied. Results showed that microstructures of ZG0Cr26Ni5Mo3Cu3 after solution treatment consists of ferrite(α) phase and austenite(γ) phase; after being tempered at different temperatures, σ phase appeared due to a eutectoid-type reaction of α→σ+γ2 during tempering treatment. It was observed that σ phase distributed along the grain boundary. The volume fraction of σ and γ phases increased with increasing tempering temperature in the range of 720 to 780 ℃, whereas the volume fraction of α phase showed the opposite trend. When the percentage of σ phase increased, the hardness of steel also increased. In the solution treated steel, hardness was measured to be only 244.0 HB, because σ phase did not appear. However, it increased to 391.8 HB when the DSS was tempered at 780℃because a great of deal of σ phase appeared. The impact toughness and corrosion resistance of DSS decreased when the percentage of σ phase increased. | Ze-hua Zhu Wei-dong Zhang Xiao-hui Tu Xiao-jian Wang Wei Li | 2018 | China Foundry2018，15，3： | 3 |
| 2 | SIGMAPLUG—A NEW TEMPERATURE INDICATOR FOR REMAINING LIFE ASSESSMENT OF HIGH TEMPERATURE COMPONENTS显示文摘1.IntroductionItisgeneralyacceptedthattheeficiencyandreliabilityofpowerplantsareofparamountimportanceinsupportingthegrowthoft... | J.K.L. Lai, C.H. Shek and K.W. Wong Department of Physics and Materials Science, City University of Hong Kong, 27887808, China | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，1： | 2 |
| 3 | Influence of sigma phase on corrosion and mechanical properties of 2707 hyper-duplex stainless steel aged for short periods显示文摘2707 hyper-duplex stainless steels (HDSSs) contain high contents of alloying elements (Cr, Ni, Mo and N), which may shorten the incubation period and promote both nucleation and growth of sigma (σ) phase. 2707 HDSS was first aged at different temperatures and periods of time for drawing the time-temperature-transformation profiles. The results identified the main precipitates as σ phase, with nose temperature of about 950℃. Also, 2707 specimen was aged at 950℃ for a short time, and the morphology, distribution and amount of σ phase were examined through the scanning electron microscope and X-ray diffraction,σ phase was initially formed at the boundaries of ferrite and austenite and then transformed through the eutectoid reaction (α→σ+γ2). Finally, the precipitation and growth of σ phase in 2707 steels aged at nose temperature for a short period reduced the corrosion resistance and deteriorated the mechanical properties, and the corresponding reason was further analyzed. | Jian Wang Wan-li Chen Hao-jie Meng Yi-shi Cui Cai-li Zhang Pei-de Han | 2019 | Journal of Iron and Steel Research(International)2019，26，5： | 2 |
| 4 | An assessment of oil spill detection using Sentinel 1 SAR-C images显示文摘Identification of an oil spill is additionally essential to evaluate the potential spread and float from the source to the adjacent coastal terrains.In such manner,usage of Synthetic Aperture RADAR(SAR)information for the recognition and checking of oil spills has gotten extensive consideration as of late,because of their wide zone inclusion,day-night and all-weather capabilities.The present examination studies an oil spill occurred in the Al Khafji region by applying Sentinel 1 SAR-C images.Al Khafji is on the borderline between Saudi Arabia and Kuwait in the Persian Gulf and it is detected as an unbiased zone.Al Khafji region can possibly deliver in excess of 7472.403 m³barrels of oil for every day(m³/d).Approaches dependent on multi-sensor satellite images examination have been produced for distinguishing oil spills from referred to common leaks just as oil slick procedures.In this paper,one of these techniques is associated with Sentinel 1 images of a known region of natural oil leakage and of an ongoing oil slick incident in Al Khafji zone.The Synthetic Aperture Radar(SAR)is perceived as the most significant remote sensing apparatus for the ocean and ocean waters oil slick examination,recording,documentation and propagation.Specifically,this paper examines oil spills recognition in the Persian Gulf surveyed by utilizing Sentinel-1(SAR-C)imageries.Results demonstrated the significance of the VV polarization of the Sentinel-1 for recognizing oil-spills just as the diminished utility of the VH polarization in this sole circumstance. | Sudhir Kumar Chaturvedi Saikat Banerjee Shashank Lele | 2020 | Journal of Ocean Engineering and Science2020，5，2： | 0 |
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