METALLOGRAPHIC STUDY ON SEGREGATION BEHAVIOUR OF P IN COLD-ROLLED Fe-P ALLOYS DURING ANNEALING

摘要

The segregation behaviour of P and its effect on structure of 70%-reduction cold rolled Fe-Palloys containing different contents of P,e.g.,0.007,0.06 and 0.09% P,during annealing at200-700℃ under vacuum have been studied by means of metallography and EPMA.The Pwas found to segregate preferentially along dislocation line during recovery annealing.TheP-riched dislocation densing region,the P-depleted region and the sub-grain-like boundarythus formed.The nuclei grow preferentially during recrystallization in such region that the Psegregation is more evident and the residual strain by dislocation densing increases to largeextent.After recrystallizing,the P segregates along grain boundaries and makes the grains inalloy fine. Engineer,Institute ofCorrosion and Protection of Metals,AcademiaSinica,Shenyang 110015。