PREPARATION AND MICROSTRUCTURE OF HARD BAINITE IN SURFACE LAYER OF CARBURIZED 20CrMnMoAl STEEL

doi:10.3724/SP.J.1037.2011.00093

Acta Metall Sin

2011, Vol. 47

Issue (8): 1038-1045 DOI: 10.3724/SP.J.1037.2011.00093

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PREPARATION AND MICROSTRUCTURE OF HARD BAINITE IN SURFACE LAYER OF CARBURIZED 20CrMnMoAl STEEL

ZHANG Peng, ZHANG Fucheng, WANG Tiansheng

State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004

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ZHANG Peng ZHANG Fucheng WANG Tiansheng. PREPARATION AND MICROSTRUCTURE OF HARD BAINITE IN SURFACE LAYER OF CARBURIZED 20CrMnMoAl STEEL. Acta Metall Sin, 2011, 47(8): 1038-1045.

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Abstract A new technology was developed based on carburization and succedent low–temperature austempering to produce hard bainitic microstructure in the surface layer of low–carbon steel 20CrMnMoAl. The microstructure and property of the hard bainite were investigated. The samples were carburized in a gas carburizing furnace at 930 ℃ for 8 h. The carbon content in the surface layer increased to 0.81%(mass fraction) after carburization. The carbonized samples were heated at 930℃ for austenitization and then isothermally quenched at different temperatures in salt bath. The microstructures were investigated by OM, TEM and XRD, and the hardness was tested by HV–sclerometer. The results show that for the samples which were isothermally quenched at 220 and 250℃, ultrafine hard bainite was obtained in the surface layer with a hardness of 630 HV. The plate of ultrafine bainitic ferrite was as thin as 70 nm and film of retained austenite had a thickness of several nanometers. Low carbon lath martensite was obtained in the center and mixstructures of the ultrafine bainite and low carbon martensite in the transition layer.

Key words: hard bainite carbonization austempering low carbon steel

Received: 25 February 2011

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Supported by National Science Foundation for Distinguished Young Scholars of China (No.50925522), National Natural Science Foundation of China (Nos.50871094 and 50821001) and Excellent Youth Foundation of Hebei Province Scientific Committee of China (No.E2009001632)

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00093 OR https://www.ams.org.cn/EN/Y2011/V47/I8/1038

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