The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform

Ke Yang - One of the best experts on this subject based on the ideXlab platform.

  • effects of Aging Time on intergranular and pitting corrosion behavior of cu bearing 304l stainless steel in comparison with 304l stainless steel
    Corrosion Science, 2016
    Co-Authors: Jie Jiang, Dake Xu, Tong Xi, Babar M Shahzad, Saleem M Khan, Jinlong Zhao, Chunguang Yang, Tingyue Gu, Ke Yang
    Abstract:

    Abstract In this work, the effects of Aging Time on intergranular and pitting corrosion behavior of Cu-bearing 304L and 304L stainless steels were investigated by using the double loop electrochemical potentiokinetic reactivation (DL-EPR) and the potentiostatic polarization electrochemical methods. The results showed that the Cu-bearing 304L stainless steel possessed a higher intergranular corrosion tendency and a higher pitting corrosion rate for extended Aging Time. The TEM observation and 3D APT analysis confirmed that above behavior could mainly attribute to the precipitation of the Cu-rich phase in the Cu-bearing 304L stainless steel.

  • copper precipitation behavior and mechanical properties of cu bearing 316l austenitic stainless steel a comprehensive cross correlation study
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2016
    Co-Authors: Babar M Shahzad, Jinlong Zhao, Chunguang Yang, Ke Yang
    Abstract:

    Abstract The effect of precipitation hardening on mechanical properties and coarsening behavior of Cu-rich precipitates in a Cu-bearing 316L austenite stainless steel after Aging at 700 °C for different Time were systematically investigated. The variations of morphology and composition of Cu-rich precipitates as a function of Aging Time were respectively characterized by electrical resistivity, atom probe tomography (APT) and transmission electron microscopy (TEM). It was found that both hardness and mechanical strength increased to peak value within short Aging Time, and remained nearly unchanged with prolonged Aging Time. The TEM observation confirmed a coherent interface between Cu-rich precipitates and austenite matrix, while high number densities of spheroidal Cu-rich precipitates were observed in all aged samples. APT analyses confirmed virtually 100% Cu core composition of Cu-rich precipitates, whereas the average radius was slightly increased from 1.38±0.46 nm to 2.39±0.81 nm with increasing the Aging Time. The relatively slow growth and coarsening behavior of Cu-rich precipitates was largely attributed to the slower diffusion kinetics of Cu, low interfacial energy and high strain energy of Cu-rich precipitates in the austenite matrix, and was well predicted by the Lifshitz-Slyozov-Wagner theory. The slow increase in average radius of Cu-rich precipitates was consistent with the modest change in hardness and yield strength with extended Aging. In addition, the precipitation strengthening effects of Cu-rich precipitates were quantitatively evaluated and analyzed. These cumulative results and analyses could provide a solid foundation for much wider applications of Cu-bearing stainless steels.

Jie Jiang - One of the best experts on this subject based on the ideXlab platform.

Richard C Easter - One of the best experts on this subject based on the ideXlab platform.

  • estimating black carbon Aging Time scales with a particle resolved aerosol model
    Journal of Aerosol Science, 2010
    Co-Authors: Nicole Riemer, Matthew West, Rahul A Zaveri, Richard C Easter
    Abstract:

    Understanding the Aging process of aerosol particles is important for assessing their chemical reactivity, cloud condensation nuclei activity, radiative properties and health impacts. In this study we investigate the Aging of black carbon containing particles in an idealized urban plume using a new approach, the particle-resolved aerosol model PartMC-MOSAIC. We present a method to estimate Aging Time-scales using an Aging criterion based on cloud condensation nuclei activation. The results show a separation into a dayTime regime where condensation dominates and a nightTime regime where coagulation dominates. There is also a strong dependence on supersaturation threshold. For the chosen urban plume scenario and supersaturations ranging from 0.1% to 1%, the Aging Time-scales vary between 11 and 0.068 h during the day, and between 54 and 6.4 h during the night.

  • estimating black carbon Aging Time scales with a particle resolved aerosol model
    arXiv: Atmospheric and Oceanic Physics, 2009
    Co-Authors: Nicole Riemer, Matthew West, Rahul A Zaveri, Richard C Easter
    Abstract:

    Understanding the Aging process of aerosol particles is important for assessing their chemical reactivity, cloud condensation nuclei activity, radiative properties and health impacts. In this study we investigate the Aging of black carbon containing particles in an idealized urban plume using a new approach, the particle-resolved aerosol model PartMC-MOSAIC. We present a method to estimate Aging Time-scales using an Aging criterion based on cloud condensation nuclei activation. The results show a separation into a dayTime regime where condensation dominates and a nightTime regime where coagulation dominates. For the chosen urban plume scenario, depending on the supersaturation threshold, the values for the Aging Time-scales vary between 0.06 hours and 10 hours during the day, and between 6 hours and 20 hours during the night.

Jin Li - One of the best experts on this subject based on the ideXlab platform.

  • effect of Aging Time on intergranular corrosion behavior of a newly developed ldx 2404 lean duplex stainless steel
    Journal of Alloys and Compounds, 2016
    Co-Authors: Hui Zhao, Ziying Zhang, Huizhen Zhang, Jun Hu, Jin Li
    Abstract:

    Abstract The effect of Aging at 700 °C for various Times on the intergranular corrosion behavior of LDX 2404 duplex stainless steel is investigated by morphological observation and electrochemical detection. Scanning electronic microscopy and transmission electronic microscopy analysis reveal that Cr 2 N, M 23 C 6 and the sigma and chi phases nucleate simultaneously at the initial stages of Aging. The granular particles of sigma phase grow larger but fewer with the increase of Aging Time. The electrochemical detection results show that intergranular corrosion become more severe and the corrosion type evolves from intergranular corrosion into general corrosion as the holding Time extends to 48 h.

  • evaluation of aged duplex stainless steel uns s32750 susceptibility to intergranular corrosion by optimized double loop electrochemical potentiokinetic reactivation method
    Corrosion Science, 2013
    Co-Authors: Jufeng Hong, Jin Li, Yiming Jiang
    Abstract:

    Optimized double loop electrochemical potentiokinetic reactivation (DL-EPR) in combination with microstructure observation were successfully applied to study the sensitization of super duplex stainless steel UNS S32750 aged at 900 °C for different duration to intergranular corrosion (IGC). The results indicated that the degree of sensitization increased gradually with the Aging Time increased from 10 min to 4 h due to the sigma phase precipitation, and Ir:Ia value reached the maximum value of 17.1%. However, further increasing Aging Time slightly decreased the sensitization due to the healing effect incurred by the diffusion of chromium from adjacent grains to chromium-depleted zone.

Babar M Shahzad - One of the best experts on this subject based on the ideXlab platform.

  • effects of Aging Time on intergranular and pitting corrosion behavior of cu bearing 304l stainless steel in comparison with 304l stainless steel
    Corrosion Science, 2016
    Co-Authors: Jie Jiang, Dake Xu, Tong Xi, Babar M Shahzad, Saleem M Khan, Jinlong Zhao, Chunguang Yang, Tingyue Gu, Ke Yang
    Abstract:

    Abstract In this work, the effects of Aging Time on intergranular and pitting corrosion behavior of Cu-bearing 304L and 304L stainless steels were investigated by using the double loop electrochemical potentiokinetic reactivation (DL-EPR) and the potentiostatic polarization electrochemical methods. The results showed that the Cu-bearing 304L stainless steel possessed a higher intergranular corrosion tendency and a higher pitting corrosion rate for extended Aging Time. The TEM observation and 3D APT analysis confirmed that above behavior could mainly attribute to the precipitation of the Cu-rich phase in the Cu-bearing 304L stainless steel.

  • copper precipitation behavior and mechanical properties of cu bearing 316l austenitic stainless steel a comprehensive cross correlation study
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2016
    Co-Authors: Babar M Shahzad, Jinlong Zhao, Chunguang Yang, Ke Yang
    Abstract:

    Abstract The effect of precipitation hardening on mechanical properties and coarsening behavior of Cu-rich precipitates in a Cu-bearing 316L austenite stainless steel after Aging at 700 °C for different Time were systematically investigated. The variations of morphology and composition of Cu-rich precipitates as a function of Aging Time were respectively characterized by electrical resistivity, atom probe tomography (APT) and transmission electron microscopy (TEM). It was found that both hardness and mechanical strength increased to peak value within short Aging Time, and remained nearly unchanged with prolonged Aging Time. The TEM observation confirmed a coherent interface between Cu-rich precipitates and austenite matrix, while high number densities of spheroidal Cu-rich precipitates were observed in all aged samples. APT analyses confirmed virtually 100% Cu core composition of Cu-rich precipitates, whereas the average radius was slightly increased from 1.38±0.46 nm to 2.39±0.81 nm with increasing the Aging Time. The relatively slow growth and coarsening behavior of Cu-rich precipitates was largely attributed to the slower diffusion kinetics of Cu, low interfacial energy and high strain energy of Cu-rich precipitates in the austenite matrix, and was well predicted by the Lifshitz-Slyozov-Wagner theory. The slow increase in average radius of Cu-rich precipitates was consistent with the modest change in hardness and yield strength with extended Aging. In addition, the precipitation strengthening effects of Cu-rich precipitates were quantitatively evaluated and analyzed. These cumulative results and analyses could provide a solid foundation for much wider applications of Cu-bearing stainless steels.