The behaviour of baron segregation at grain boundaries in Fe-3% Si has been studied by means of particle tracking autoradiography(PTA).The results indicate that the tendency of equilibrium segregation of B at grain bo...The behaviour of baron segregation at grain boundaries in Fe-3% Si has been studied by means of particle tracking autoradiography(PTA).The results indicate that the tendency of equilibrium segregation of B at grain boundaries in Fe-3% Si is higher than that in austenitic alloys.No observable nonequilibrium segregation of B at grain boundaries was revealed in Fe-3% Si alloy during cooling and isothermal holding.The binding energy between boron at- oms and grain boundaries is 55.7±1.7 kJ/mol.Based on the complex mechanism of B segre- gation of quenching-induce-nonequilibrium segregation,different behaviours of B segrega- tion in γ-Fe and bcc Fe-3% Si alloy were discussed.展开更多
By means of particle tracking auloradiography it has been found that there exisls a strong tendency of equilibrium grain boundary segregation of B in Ni with binding energy of 18±2 kJ/mol.In Ni-Mo-B alloyshe segr...By means of particle tracking auloradiography it has been found that there exisls a strong tendency of equilibrium grain boundary segregation of B in Ni with binding energy of 18±2 kJ/mol.In Ni-Mo-B alloyshe segregelion is alleviated.For additions of 0.5% and 3% Ma lhe grain boundary binding energies of B de.crease to 14±lkJ/movand l3±1kJ/mol respectively.展开更多
文摘The behaviour of baron segregation at grain boundaries in Fe-3% Si has been studied by means of particle tracking autoradiography(PTA).The results indicate that the tendency of equilibrium segregation of B at grain boundaries in Fe-3% Si is higher than that in austenitic alloys.No observable nonequilibrium segregation of B at grain boundaries was revealed in Fe-3% Si alloy during cooling and isothermal holding.The binding energy between boron at- oms and grain boundaries is 55.7±1.7 kJ/mol.Based on the complex mechanism of B segre- gation of quenching-induce-nonequilibrium segregation,different behaviours of B segrega- tion in γ-Fe and bcc Fe-3% Si alloy were discussed.
文摘By means of particle tracking auloradiography it has been found that there exisls a strong tendency of equilibrium grain boundary segregation of B in Ni with binding energy of 18±2 kJ/mol.In Ni-Mo-B alloyshe segregelion is alleviated.For additions of 0.5% and 3% Ma lhe grain boundary binding energies of B de.crease to 14±lkJ/movand l3±1kJ/mol respectively.
