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The Effect of Surface Self-Nanocrystallization on Low-Temperature Gas Carburization for AISI 316L Steel

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Abstract:

In this work, the effect of surface self-nanocrystallization on low-temperature gas carburizing for AISI316L austenitic stainless steel has been studied. The surface ultrasonic rolling processing (SURP) was used to prepare nanostructured surface layers, and then the un-SURP and SURP samples were treated by LTGC at 470 °C for 10 h, 20 h and 30 h. In order to analyze the effect of surface self-nanocrystallization on low-temperature gas carburizing, optical microscopy (OM), atomic force microscope (AFM), scanning electron probe micro-analyzer (EPMA) and nano-indentation analyzer were used. The results show depth of SURP-induced plastic deformation layer was about 330 μm. Meanwhile, the surface hardness and elastic modulus were increased but the surface roughness decreased obviously after SURP. After low-temperature gas carburizing, according to the results of the thickness, carbon concentration, nano-hardness and elastic modulus of the carburized layer, the conclusion is that surface self-nanocrystallization carried by SURP has a negative effect on the low-temperature gas carburizing for AISI316L austenitic stainless steel and with the increase of carburizing time, the greater the adverse effect on carburizing.

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Periodical:

Key Engineering Materials (Volume 795)

Pages:

137-144

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.795.137

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Online since:

March 2019

Authors:

Zhe Liu, Ya Wei Peng, Jian Ming Gong*, Chao Ming Chen

Keywords:

Carburized Layer, Low-Temperature Gas Carburization (LTGC), Surface Self-Nanocrystallization, Surface Ultrasonic Rolling Processing (SURP)

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© 2019 Trans Tech Publications Ltd. All Rights Reserved

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