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- W2359187070 abstract "The composite structure with a nano crystallized surface and the matrix is very useful to obtain good comprehensive properties.Surface nanocrystallization is an important way to make a good combination of high hardness on the surface and good ductility at the center of materials,which not only modifies the surfacial properties,but also provides more channels to accelerate atoms to diffuse.In this work,a nanostructured layer was fabricated on a 0Cr18Ni9 stainless steel sheet surface by a supersonic fine particle bombarding(SFPB) technique,and followed by low temperature gas nitriding.The effect of the nanocrystallization on the surface of the 0Cr18Ni9 stainless steel on thermal stability and the gas nitriding at low temperature was investigated by metallograph,XRD,TEM and microscopic hardness.It is found that a deformation zone with a depth of about 250μm is formed on the surface after SFPB treatment.The surface microstructure is composed of nanocrystals with an average grain size of 15 nm.It is also found that twinning dominantly controls surface deformation. Meanwhile,there is martensite transformation on the surface during the deformation,thus resulting in a significant increase of surface hardness.After nitriding at 450℃,the SFPB treated specimen shows an excellent thermal stability with a stable hardness even though no obviously coarsening of nanocrystal on the surface layer and a slight decrease of the amount of martensites.In comparison with the specimen without SFPB treatment,grain refinement,martensite transformation and excellent thermal stability are the main reasons favorable for rapid nitriding at low temperature,which contribute to the thicker nitriding layer,the further increase of surface hardness and the improvement of hardness gradient." @default.
- W2359187070 created "2016-06-24" @default.
- W2359187070 creator A5026113741 @default.
- W2359187070 date "2009-01-01" @default.
- W2359187070 modified "2023-09-28" @default.
- W2359187070 title "EFFECT OF SURFACE NANO CRYSTALLIZATION AND THERMAL STABILITY OF 0Cr18Ni9 STAINLESS STEEL ON LOW TEMPERATURE NITRIDING BEHAVIOR" @default.
- W2359187070 hasPublicationYear "2009" @default.
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