Research of Control Cooling Heat Treatment Process in the Ductile Iron Gear

Abstract:

By controlling the cooling, mean temperature adjustment and isothermal cooling process, bainite and martensite can be produced in the surface and the core of the ductile iron gear using the 75°C hot water as the quenching medium. Since it has a high hardness value in the point and the pitch circle, a low hardness value in the root and the core, this ductile iron can be applied to the actual production of the gear. The gear surface organization will be affected by quenching cooling time. The appearance of the temper phenomenon can result in the decrease of hardness value in the surface of the gear when the cooling time is short..However, the content of the lower bainite can be increased by extending the cooling time properly in the surface of the gear. The influence of the quenching cooling time on the core organization of the gear is small.

• Periodical: Advanced Materials Research (Volume 1014)
• Pages: 134-137
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1014.134
• Online since: July 2014
• Authors: Zhi Gang Wang*, Dong Xiang, Ke Gao Liu, Min Jing
• Keywords: Bainite, Control Cooling, Ductile Gear

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