The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform

T. Christman - One of the best experts on this subject based on the ideXlab platform.

  • Processing of submicron grain 304 stainless steel
    Journal of Materials Research, 1996
    Co-Authors: M. Jain, T. Christman
    Abstract:

    A novel thermomechanical processing Technique for the synthesis of bulk submicron grain (grain size approximate to 200 nm) 304 stainless steel is reported. This ingot-Metallurgical Technique requires a total deformation of only 95%, and the key steps to this processing Technique involve (i) formation of ultrafine dislocation cell structure, and (ii) the conversion of dislocation cells into grains with medium to high misorientation by grain boundary sliding.

  • Processing of submicron grain 304 stainless steel
    Journal of Materials Research, 1996
    Co-Authors: M. Jain, T. Christman
    Abstract:

    A novel thermomechanical processing Technique for the synthesis of bulk submicron grain (grain size ≈ 200 nm) 304 stainless steel is reported. This ingot-Metallurgical Technique requires a total deformation of only 95%, and the key steps to this processing Technique involve (i) formation of ultrafine dislocation cell structure, and (ii) the conversion of dislocation cells into grains with medium to high misorientation by grain boundary sliding.

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

  • Processing of submicron grain 304 stainless steel
    Journal of Materials Research, 1996
    Co-Authors: M. Jain, T. Christman
    Abstract:

    A novel thermomechanical processing Technique for the synthesis of bulk submicron grain (grain size approximate to 200 nm) 304 stainless steel is reported. This ingot-Metallurgical Technique requires a total deformation of only 95%, and the key steps to this processing Technique involve (i) formation of ultrafine dislocation cell structure, and (ii) the conversion of dislocation cells into grains with medium to high misorientation by grain boundary sliding.

  • Processing of submicron grain 304 stainless steel
    Journal of Materials Research, 1996
    Co-Authors: M. Jain, T. Christman
    Abstract:

    A novel thermomechanical processing Technique for the synthesis of bulk submicron grain (grain size ≈ 200 nm) 304 stainless steel is reported. This ingot-Metallurgical Technique requires a total deformation of only 95%, and the key steps to this processing Technique involve (i) formation of ultrafine dislocation cell structure, and (ii) the conversion of dislocation cells into grains with medium to high misorientation by grain boundary sliding.

Hong Zhong - One of the best experts on this subject based on the ideXlab platform.

  • novel and green Metallurgical Technique of comprehensive utilization of refractory limonite ores
    Journal of Cleaner Production, 2018
    Co-Authors: Zhanfang Cao, Shuai Wang, Hong Zhong
    Abstract:

    Abstract Limonite ores are a common and widely distributed refractory iron oxide ores in the world. In this paper, in view of the growing development of steel and iron industry, the depletion of easy-processing iron ores and growing environmental concerns, a novel and green Technique route was proposed to comprehensive utilize limonite ores by asynchronously recovering various valuable elements. The Technique route included three stages: recovery (enrichment) of Fe and Mn by removal of impurities (Al and Si phases) via microwave-assisted roasting-acid leaching process using alkali lignin and Na2CO3-Na2SO4 binary sodium salts as roasting additives, where Na2SO4 was favorable for the aggregation and growth of iron-rich grains, Na2CO3 could enhance the activation of Al and Si phases and then improve the acid leaching of Al and Si, and alkali lignin has a favorable effect on the leaching; recovery of Si by ripening the acid leached liquor, where Si was enriched and extracted in the form of silica gel through the polymerization of silicic acid; and stepwise recovery of small amount of leached Fe and Mn as well as Al by neutralizing and precipitating of filtrate from the 2nd stage using NaOH solution and NaHCO3 solution as precipitating reagents, respectively. The final Na2SO4 and Na2CO3 filter liquor could be recycling used in the roasting process by evaporation pretreatment, achieving zero pollution and zero waste. By performing acid leaching process on the roasted ore treated at 200 °C, 600 W for 30 min in the presence of 5% alkali lignin, 5% Na2CO3 and 5% Na2SO4, an iron concentrate assaying 57.08% Fe with the corresponding iron recovery ratio of 92.04% and yield of 64.66% was obtained from the refractory limonite ore containing 40.10% Fe, 8.69% Mn, 9.40% Al, and 6.92% Si. Besides, Mn was simultaneous enriched in the iron concentrate with a Mn recovery ratio of 71.73% and a Mn grade of 9.64%. Simultaneously, 84.11% of Si and 80.26% of Al existed in the limonite ore were extracted, and leaching ratios of Fe and Mn were only 7.96% and 28.27%, respectively. Subsequently, silica gel containing 93.31% SiO2 and Al(OH)3 precipitate containing 41.59% Al2O3 and Mn-Fe precipitate with 33.08% Fe and 14.83% Mn were successfully stepwise obtained by the last two stages. The proposed Technique with the advantages of mild reaction conditions and discharge reducing, meeting the demands of green metallurgy, would potentially be a feasible route for the utilization of limonite ores, easing the shortages of iron and promoting the sustainable development of steel and iron industry.

D.c. Jia - One of the best experts on this subject based on the ideXlab platform.

  • Microstructure of SiCw reinforced Al–12Ti composites prepared by powder Metallurgical Technique
    Materials Science and Technology, 1999
    Co-Authors: Y. Zhou, D.c. Jia
    Abstract:

    AbstractSilicon carbide whisker reinforced Al–12Ti composites were fabricated by a powder Metallurgical Technique, and the microstructures were characterised by the means of X-ray diffraction, SEM, TEM, and energy dispersion X-ray analysis. It has been shown that secondary phase particles, Al3 Ti, form in situ during hot pressing after premechanically ball milling, and a small amount of α-Ti is left because the in situ reaction between α-Ti and Al is not complete. High density dislocations including dislocation lines and dislocation loops exist in the coarse Al3 Ti grains, while, hardly any dislocations can be found using TEM in the very fine (∼150 nm) Al3 Ti grains. In addition, nanometer equiaxed γ-Al2O3 and stick shaped Al4 C3 dispersoids form in the Al matrix as a result of the addition of a processing control agent. There is no fixed orientation relationships between γ-Al2O3 , Al4 C3 , and the Al matrix. Dislocations in the Al matrix are too sparse to be found even in the zones around SiC whiskers. S...

Hetong Han - One of the best experts on this subject based on the ideXlab platform.