Strain-induced Microstructure Refinement in a Tool Steel Subjected to Surface Mechanical Attrition Treatment

J Mater Sci Technol ›› 2010, Vol. 26 ›› Issue (3): 258-263.

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Strain-induced Microstructure Refinement in a Tool Steel Subjected to Surface Mechanical Attrition Treatment

Shoudan Lu, Zhenbo Wang, Ke Lu

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Received:2009-04-24 Revised:2009-07-29 Online:2010-03-28 Published:2010-03-22
Contact: Zhenbo Wang
Supported by:
the National Natural Science Foundation of China (Nos. 50621091, 50701044 50890171)
the Ministry of Science and Technology (No. 2005CB623604)
the National High Technology Research and Development Program of China (No. 2007AA03Z352)

Abstract

Abstract:

A nanostructured surface layer has been fabricated on an AISI H13 tool steel by means of surface mechanical attrition treatment (SMAT). Strain-induced refinement processes of ferrite grains and carbide particles have been investigated by transmission electron microscopy (TEM) and scanning electron microscopy (SEM) in the SMAT surface layer. Grain refinement of ferrite is found to be dominated by dislocation activities and greatly facilitated by a large number of carbide particles at a depth >20μm. The comparisons with microstructure refinement processes in other SMAT ferrite steels indicate that a larger volume fraction of carbide particles with a lower shear strength is expected to facilitate the refinement process of ferrite grains.

Key words: Nanostructured and nanocrystalline material, AISI H13 tool steel, Grain refinement, Surface mechanical attrition treatment (SMAT), Carbides

Shoudan Lu Zhenbo Wang Ke Lu. Strain-induced Microstructure Refinement in a Tool Steel Subjected to Surface Mechanical Attrition Treatment[J]. J Mater Sci Technol, 2010, 26(3): 258-263.

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Strain-induced Microstructure Refinement in a Tool Steel Subjected to Surface Mechanical Attrition Treatment

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