Effects of cold rolling on the microstructure and mechanical properties of Fe-Ni-Mn-Mo-Ti-Cr maraging steels were studied.To investigate the microstructure and mechanical properties,optical microscopy,scanning electro...Effects of cold rolling on the microstructure and mechanical properties of Fe-Ni-Mn-Mo-Ti-Cr maraging steels were studied.To investigate the microstructure and mechanical properties,optical microscopy,scanning electron microscopy,X-ray diffraction,tensile test,and hardness test were used.The results show that the solution-annealing treatment in the cold-rolled steel redounds to the formation of sub-microcrystalline Fe2（Mo,Ti） Laves phase particles,which are stable at high temperatures.These secondary Laves phase particles prevent from recrystallization at high temperatures and correspond to semi-brittle fracture in the subsequent aging treatment.展开更多
A combination study of magnetic and magnetostrictive properties in directionally cast(DC)(un-annealed)and differently heat-treated Fe-19 at%Ga samples was carried out at room temperature.Slow cooling leads to an incre...A combination study of magnetic and magnetostrictive properties in directionally cast(DC)(un-annealed)and differently heat-treated Fe-19 at%Ga samples was carried out at room temperature.Slow cooling leads to an increase in the occupation of[200]easy magnetic axis.However,structural ordering of Ga atoms into a metastable D03 phase decreases the saturation magnetostriction(λs)and saturation magnetization(Ms),while increases coercivity(Hc).Water quenching suppresses the formation of stable fee ordered phase(L12)and largely preserves disordered bcc single-phase(A2)structure down to room temperature,leading to enhanced magnetostriction and magnetization.Slow cooling promotes the ordering of metastable bcc ordered phase(D03).Magnetic force microscopy(MFM)study exhibits that the water-quenched(WQ)sample consists of a well-aligned stripe domain structure,while irregular maze-like domain structure is observed in furnace-cooled(FC)sample.The results confirm that in addition to an inhibitory effect of D03 ordering on magnetic domain wall motions,irregular magnetic domains also contribute to decrease in magnetic and magnetostrictive properties of FC sample.展开更多
文摘Effects of cold rolling on the microstructure and mechanical properties of Fe-Ni-Mn-Mo-Ti-Cr maraging steels were studied.To investigate the microstructure and mechanical properties,optical microscopy,scanning electron microscopy,X-ray diffraction,tensile test,and hardness test were used.The results show that the solution-annealing treatment in the cold-rolled steel redounds to the formation of sub-microcrystalline Fe2（Mo,Ti） Laves phase particles,which are stable at high temperatures.These secondary Laves phase particles prevent from recrystallization at high temperatures and correspond to semi-brittle fracture in the subsequent aging treatment.
文摘A combination study of magnetic and magnetostrictive properties in directionally cast(DC)(un-annealed)and differently heat-treated Fe-19 at%Ga samples was carried out at room temperature.Slow cooling leads to an increase in the occupation of[200]easy magnetic axis.However,structural ordering of Ga atoms into a metastable D03 phase decreases the saturation magnetostriction(λs)and saturation magnetization(Ms),while increases coercivity(Hc).Water quenching suppresses the formation of stable fee ordered phase(L12)and largely preserves disordered bcc single-phase(A2)structure down to room temperature,leading to enhanced magnetostriction and magnetization.Slow cooling promotes the ordering of metastable bcc ordered phase(D03).Magnetic force microscopy(MFM)study exhibits that the water-quenched(WQ)sample consists of a well-aligned stripe domain structure,while irregular maze-like domain structure is observed in furnace-cooled(FC)sample.The results confirm that in addition to an inhibitory effect of D03 ordering on magnetic domain wall motions,irregular magnetic domains also contribute to decrease in magnetic and magnetostrictive properties of FC sample.
