Improved nitrogen transport in steels during surface nanocrystallized low-carbon gaseous nitridation
Gu, JF; Bei, DH; Pan, JS; Lu, J; Lu, K
Corresponding AuthorGu, JF()
AbstractIn the thermochemical process of low carbon steel nitridation improvements of mechanical properties are governed by the nature (hardness thickness etc) of the compound layer since the compound layer will be kept under working conditions. Because of low nitrogen diffusivity m steel and low mass transfer between gaseous reaction and steel long duration and high temperature are classically used for thermal nitridation. The present study shows that improved nitrogen transport can be obtained by gaseous nitridation after the samples have been surface nanocrystallized by ultrasonic shot peening (USSP). Comparing to the untreated samples the nitridation efficiency of treated samples has been improved dramatically. The growth of gamma nitride layer conforms to a parabolic relationship with nitridation duration during the whole nitridation process in treated samples while in untreated samples the growth of nitride layer could be traditionally divided into two stages the first linear growth stage and the second parabolic growth stage. This difference clearly indicated that the whole nitridation process is diffusion controlled in treated samples instead of interface reaction controlled stage and then diffusion controlled stage in untreated samples. The high nitridation efficiency obtained may be explained by an increased volume fraction of grain boundary and an enhanced reactivity of surface atoms of the steel samples due to the nanostructure layer generated by surface nanocrystallization of USSP. (C) 2002 Elsevier Science B.V. All rights reserved.
Keywordgaseous nitridation growth reactivity diffusion nanostructure ultrasonic shot peening (USSP) surface nanocrystallization
Indexed BySCI
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Physics, Applied
WOS IDWOS:000177740900012
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Cited Times:53[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorGu, JF
Affiliation1.Univ Technol Troyes, LASMIS, F-10010 Troyes, France
2.Shanghai Jiao Tong Univ, Key lab High Temp Mat & Tests, Educ Mininst, Shanghai 200030, Peoples R China
3.Chinese Acad Sci, State Key Lab RSA, Met Res Inst, Shenyang 110015, Peoples R China
Recommended Citation
GB/T 7714
Gu, JF,Bei, DH,Pan, JS,et al. Improved nitrogen transport in steels during surface nanocrystallized low-carbon gaseous nitridation[J]. MATERIALS LETTERS,2002,55(5):340-343.
APA Gu, JF,Bei, DH,Pan, JS,Lu, J,&Lu, K.(2002).Improved nitrogen transport in steels during surface nanocrystallized low-carbon gaseous nitridation.MATERIALS LETTERS,55(5),340-343.
MLA Gu, JF,et al."Improved nitrogen transport in steels during surface nanocrystallized low-carbon gaseous nitridation".MATERIALS LETTERS 55.5(2002):340-343.
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