By means of heavy cold rolling and annealing,
Fu etal. realized rapid cementite spheroidizing and obtained
(aþy) micro-duplex structures inFe–0.8 C steel.Furuhara also
obtained (aþy) micro-duplex structures in Fe–1.4 Cr–1.0 C steel
using the same method. Lvetal. investigated the coarsening
kinetics of y particles in severely cold rolled and annealed pearlite
in Fe–0.8C mass% alloys.They discussed the effect of alloying
elements on the coarsening behavior of cementite. SunandXiong
successfully producedan ultrafine (aþy) structure through
warm cross-wedgerollingattheouterlayerofFe–0.8Csteelrods
where equiaxed a grains and fully spheroidized y particles are in
submicron scale.Ohetal. obtained ultrafine-grained structures with micron cementite particles in high carbon steel during
warm caliber rolling . Recent investigations have established the
potential of cyclic heat treatment techniques to accelerate cementite spheroidizing processes without deformation in steels
Saha etal. investigated the microstructure and mechanical properties of 0.16%,0.6%, and1.24% carbon steels during
cyclic heat treatment.Through cyclic heat treatment,they realized rapid cementite spheroidizing without deformation and
obtained micron y particles after several cycles.Each cycle
in their works comprises short-duration (several minutes)at
above Ac3 (Acm) temperature followed by forced air-cooling to
room temperature. In the seinvestigations, the non-equilibrium
temperature reversal effect during cyclic thermal treatment is explained as the prime factor causing excitation of atoms,there by
reducing the activation energy and enhancing the process
kinetics.
By means of heavy cold rolling and annealing,Fu etal. realized rapid cementite spheroidizing and obtained(aþy) micro-duplex structures inFe–0.8 C steel.Furuhara alsoobtained (aþy) micro-duplex structures in Fe–1.4 Cr–1.0 C steelusing the same method. Lvetal. investigated the coarseningkinetics of y particles in severely cold rolled and annealed pearlitein Fe–0.8C mass% alloys.They discussed the effect of alloyingelements on the coarsening behavior of cementite. SunandXiongsuccessfully producedan ultrafine (aþy) structure throughwarm cross-wedgerollingattheouterlayerofFe–0.8Csteelrodswhere equiaxed a grains and fully spheroidized y particles are insubmicron scale.Ohetal. obtained ultrafine-grained structures with micron cementite particles in high carbon steel duringwarm caliber rolling . Recent investigations have established thepotential of cyclic heat treatment techniques to accelerate cementite spheroidizing processes without deformation in steels Saha etal. investigated the microstructure and mechanical properties of 0.16%,0.6%, and1.24% carbon steels duringcyclic heat treatment.Through cyclic heat treatment,they realized rapid cementite spheroidizing without deformation andobtained micron y particles after several cycles.Each cyclein their works comprises short-duration (several minutes)atabove Ac3 (Acm) temperature followed by forced air-cooling toroom temperature. In the seinvestigations, the non-equilibriumtemperature reversal effect during cyclic thermal treatment is explained as the prime factor causing excitation of atoms,there by
reducing the activation energy and enhancing the process
kinetics.
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