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

Journal of materials science & Technology 2010年第3期26卷 258-263页

作者： shoudan lu,zhenbo wang and ke lu shenyang national laboratory for materials science,institute of metal research,chinese academy of sciences,shenyang 110016,china [a] shenyang national laboratory for materials science institute of metal research chinese academy of sciences shenyang 110016 china

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 *** refinement of ferrite is found to be dominated by dislocation activities and greatly facilitated by a large number of carbide particles at a depth 〉20 μ*** 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.

关键词： Nanostructured and nanocrystalline material AISI H13 tool steel Grain refinement Surface mechanical attrition treatment (SMAT) Carbides

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Chromizing treatment of the surface-nanocrystallized AISI H13 steel and the improved wear resistance

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Baosteel Technical research 2010年第4期4卷 22-27页

作者： Lü shoudan,wang zhenbo and lu ke shenyang national laboratory for materials science,institute of metal research,chinese academy of sciences,shenyang 110016,china shenyang national laboratory for materials science Institute of Metal Research Chinese Academy of SciencesShenyang 110016 China

A hot-working AISI H13 tool steel was subjected to a combined process consisting of surface nanocrystallization(SNC)and chromizing treatment *** composition,microstructure,hardness and wear resistance of the chromized layer were characterized by using the scanning and transmission electron microscopy,a nano-indenter and a *** was shown that a continuous chromized layer of approximately 30 μm in thickness was formed on the SNC specimen after a dual chromizing treatment at both 600℃ and 1050℃ consecutively,as thick as about 3 times of that on the coarse-grained specimen after the same chromizing *** addition,the wear resistance of the SNC-chromized specimen was enhanced significantly,due to a smaller grain size and a higher hardness,as well as smoother gradient variations of the microstructure,composition and hardness across a greater depth in the formed chromized surface layer.

关键词： surface nanocrystallization hot-working tool steel chromizing wear resistance

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Annealing-induced Grain Refinement in a Nanostructured Ferritic Steel

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Journal of materials science & Technology 2012年第1期28卷 41-45页

作者： Limin wang zhenbo wang Sheng Guo ke lu Sheng Guo and ke lu shenyang national laboratory for materials science Institute of Metal ResearchChinese Academy of Sciences72 Wenhua RoadShenyang 110016China

A nanostructured surface layer with a mean ferrite grain size of -8 nm was produced on a Fe-gCr steel by means of surface mechanical attrition treatment. Upon annealing, ferrite grains coarsen with increasing temperature and their sizes increase to -40 nm at 973 K. Further increasing annealing temperature leads to an obvious reduction of ferrite grain sizes, to -14 nm at 1173 K. The annealing-induced grain refinement is analyzed in terms of phase transformations in the nanostructured steel.

关键词： Nanostructured Surface mechanical attrition treatment (SMAT) Ferritic steel Grain refinement Austenitization

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