Nitriding Iron and 38CrMoAl Steel with a Nanostructured Surface Layer

doi:10.7523/j.issn.2095-6134.2005.2.017

Abstract

Abstract:

The microstructure of the surface layer on a pure iron and a 38CrMoAl steel samples was refined into the nanometer scale by means of the surface mechanical attrition treatment ( SMAT) that generates repetitive severe plastic deformation in the surface layer. The subsequent nitriding kinet ics of the SMAT samples with a nanostructured surface layer is greatly enhanced so that the nitriding temperatures can be reduced to 300 e for iron and about 400 e for 38CrMoAl steel, respectively, which are much lower than the convent ional nitriding temperatures ( above 500 e ). The novel nitriding process not only facilitates reduction of torsion of the treated samples, but also provides a new approach for select ive surface reactions of solids.

Key words: nanocrystalline materials, 38CrMoAl steel, iron, nitriding, surface mechanical attrition treatment

CLC Number:

TG14

TONG Wei-Ping, TAO Nai-Rong, WANG Zhen-Bo, Lv Jian, LU KE. Nitriding Iron and 38CrMoAl Steel with a Nanostructured Surface Layer[J]. , 2005, 22(2): 230-238.

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Nitriding Iron and 38CrMoAl Steel with a Nanostructured Surface Layer

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