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- W2356408957 abstract "Extrusion deformation was performed on a T8 steel with a fully pearlitic structure by equal channel angular pressing(ECAP) through a route Bc at 650 ℃.The ultra-microduplex structure was obtained in the high carbon steel after four passes ECAP,in which the sizes of ferrite grains and cementite particles were about 400 nm and 150 nm,respectively.The mechanical properties of the steel with ultra-microduplex structure were investigated by mini-tensile tests and the morphology of fracture surfaces was observed by scanning electron microscopy(SEM).The results show that after four passes deformation,tensile strength of the steel with ultra micro duplex structure decreases slightly from 867 MPa to 819 MPa,but its yield strength obviously increases from 479 MPa to 664 MPa.Correspondingly,elongation and reduction of area of steel increase from 4.5%,5.2% to 18%,31%,respectively,which are markedly higher than those of the lamellar pearlite before ECAP.Hardness of the ultra-microduplex structure and the lamellar pearlite are almost at the same level.The tensile fracture of the ultra-microduplex structure is composed of many small dimples,which is typical ductile fracture,however,the fracture of original lamellar pearlite exhibits brittle cleavage fracture characteristics." @default.
- W2356408957 created "2016-06-24" @default.
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- W2356408957 date "2012-01-01" @default.
- W2356408957 modified "2023-09-23" @default.
- W2356408957 title "Microstructure and properties of microduplex(α+θ) structure in an ultra-fine-grained high carbon steel" @default.
- W2356408957 hasPublicationYear "2012" @default.
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