The microstructure transformation of 10CrMo910 steel after running 147000h in high temperature

摘要

Two specimens from original 10CrMo910 steel and the steel after running 147000h in high temperature were analyzed in this research by SEM,TEM,XRD and electron probe.The results show that after running 147000h in high temperature the 10CrMo910 steel has changed a lot:1) The dislocation and subgrain boundary in bainite decreased largely while that in massive ferrite almost disappeared.2) The strip-shape M3C carbides were nearly dissolved,the granular austenite was gradually transformed into martensite,the fine needle-shape Mo2C carbides coarsened,and granular carbides separated out in massive ferrite.3) There were large particles of M23C6 carbides in crystal boundary between bainite and ferrite,especially in the boundary of any three phases.And creep voids appeared.