Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 726, Issue -, Pages 298-308Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.04.094
Keywords
Ultrafine-grained ferritic steel; Nanosized carbides; Strength; Neutron diffraction
Categories
Funding
- NSAF [U1430132]
- Natural Science Foundation of China (NSFC) [51574079]
- Science and Technology Research Project of Education Department of Liaoning Province [L20150177]
- U.S. DOE [DE-AC05-00OR22725]
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The microstructures and mechanical properties of a low-alloy medium-carbon steel with a duplex microstructure composed of nanoscale spheroidized carbides in ultrafine-grained (UFG) ferritic steel are examined. The average grain size of the studied steel is similar to 430 nm, and these grains coexist with numerous carbides. Neutron diffraction reveals that the intensity of (011) and (022) peaks for the UFG sample is significantly enhanced, suggesting that the (011)//RD texture is a result of the warm rolling process. The lattice parameter of UFG steel is smaller than that of a martensitic steel (M steel) counterpart, indicating a lower carbon concentration in the lattice. The estimated dislocation densities for M steel and UFG steel are 2.59 x 10(14) cm(-2) and 1.76 x 10(12) cm(-2), respectively. The UFG steel reveals a nearly isotropic lattice strain response under initial tension from 0 to 450 MPa, where the lattice strains of the (110), (002), and (112) planes are identical. The increase of lattice strain of the (110) plane becomes smaller than that of the (002) and (112) planes as the stress exceeds 450 MPa, suggesting that the nanosized carbides contribute to the hardening ability by promoting the accumulation of geometrically necessary dislocations around the particles, and the (110) lattice becomes harder compared to the other two planes.
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