Study on the friction and wear properties of the surface nanocrystallized 1.0C-1.5Cr steel induced by the surface mechanical attrition treatment |
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Authors: | ZHANG Junbao WANG Aixiang and ZHANG Yujun Advanced Technology Division Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai China |
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Affiliation: | ZHANG Junbao1),WANG Aixiang1,2)and ZHANG Yujun1)1)Advanced Technology Division,Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 201900,China2)School of Materials Science & Engineering,Shanghai Jiao Tong University,Shanghai 200030,China |
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Abstract: | Nano-structured layers are fabricated on the surface of 1.0C-1.5Cr steel by using the surface mechanical attrition treatment(SMAT)technology,and the microstructures of the surface nano-crystallization layers are characterized by means of X-ray diffraction(XRD)and transmission electron microscopy(TEM).The friction and wear properties are also investigated by a UMT-2 friction and wear tester.Experimental research has indicated that the average diameter of nanocrystalline grains in the surface layer after being treated for 15 min is in the range of 10-20 nm,and ferrite and cementite grains can not be identified by their morphologies.The wear-resistance of the specimen treated for 15 min has been doubled,compared with that of the matrix due to the grain refinement to a nano-sized scale.The lowest friction coefficient is 0.27,which is for the specimen treated for 30 min,resulting from the dissolution of the cementite phase and the formation of a relative homogenous structure.The SMAT technique for enhancing the wear-resistance of the 1.0C-1.5Cr steel has an optimum processing time,which is in the range of 15-30 min.The dominant wear mechanism of the specimen treated for 15 min changes from adhesive wear into particle wear. |
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Keywords: | 1.0C-1.5Cr steels surface mechanical attrition treatment surface nanocrystallization friction and wear |
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