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第四届有色合金及特种铸造国际会议

作者： M. Omidi Islamic Azad University-Najafabad Branch

＜正＞ In this research, we want to determine the method of quenching and microstructural analysis and the mechanical Properties of CK 45 steel. That is used to Product the machine suspension system. For this work the different samples were austenitized for the different times in the temperature 820℃, and quenched in water. Then the samples were tempered in different temperatures and times. According to standard, the samples have a structure consisting of tempered martensit with less than 5 wt.% Ferrite. Before every kind of heat treatment.cycle, at austenitizing and quenching stage, the microscopic microstructure of this part was analysized and the hardness of different particles was measured. Considering the hardness quantities and micro structural analyses of standard and non-standard parts, we can offer a suitable range of hardness and the microstructure of quenched parts. Then with applied a suitable heat treatment.cycle, the optimum conditions was offered, which consist of these stages: The parts were austenitized for 10 minutes in the temperature of 820℃and quenched in water and then tempered for 60 minutes in the temperature of 650℃.

关键词： CK45 Steel Quenching and Austenitizing treatment heat treatment.

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Change in Aggregate Shape of heat Treated Carbon Nanoparticles

引用

Journal of Chemistry and Chemical Engineering 2013年第4期7卷 326-333页

作者： Kiminori Ono Mlkl Yanaka Aki Watanabe Yoshiya Matsukawa Yasuhiro Saito Hideyuki Aoki OkiteruFukuda Takayuki Aoki Togo Yamaguchi Department of Chemical Engineering Graduate School of Engineering Tohoku University Sendai 980-8579 Japan ASAHI CARBON Co. Ltd. Niigata 950-0883 Japan

To better understand the fusion mechanism of heated carbon black, heat treatment.is conducted for carbon black produced by benzene pyrolysis. The effects of （a） heating time, （b） heating temperature and （c） heating rate on the aggregate shape and mean primary particle diameter of the carbon black are investigated using TEM （transmission electron microscopy）. The mean primary particle diameter does not change significantly when carbon black is heat treated. For short heating times and low heating temperatures, the aggregate shapes become simple when compared with those of non-heated carbon black, and shapes become complex with an increase in the heating time. Also, for low heating rates, the aggregate shapes become significantly simple when compared with those of non-heated carbon black. The results of this study suggest that sintering between primary particles is promoted under relatively low heating temperatures, and Ostwald ripening among aggregates is promoted under relatively high heating temperatures.

关键词： Carbon black soot heat treatment.

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