Key Laboratory of Metastable Materials Science and Technology

Qinhuangdao, China

Key Laboratory of Metastable Materials Science and Technology

Qinhuangdao, China
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Zhang P.,Key Laboratory of Metastable Materials Science and Technology | Zhang F.-C.,Key Laboratory of Metastable Materials Science and Technology | Yan Z.-G.,Key Laboratory of Metastable Materials Science and Technology | Zheng C.-L.,Key Laboratory of Metastable Materials Science and Technology | And 2 more authors.
Journal of Iron and Steel Research | Year: 2011

The heat treatment to obtain ultrafine bainite in the surface layer of 38CrMoAl steel and the microstructure characteristics of ultrafine bainite were investigated. The samples carbonized at 930 °C for 8 h were heated at 930 °C for austenitization and then isothermal quenched at different temperatures in salt bath. The microstructures were investigated in the carburized layer by optical microscopy and transmission electron microscopy (TEM), and the hardness was tested by HV-sclerometer. The results show that the samples which were isothermal quenched at 230 °C for 10h and 255 °C for 4 h have obtained ultrafine bainite in the surface layer. The plate of ultrafine bainitic ferrite was as thin as 80 ran and film of retained austenite can reach a thickness of several nanometers ¡the mixstructures of the ultrafine bainite and low carbon martensite were formed in the transition layer, the low carbon martensite was formed in the center. The ultrafine bainite exhibits high rolling contact fatigue performance compared to the martensite under conventional quenching and tempering.

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