Investigation on Dissolving and Strain Induced Precipitation Behavior in Nb-Bearing Microalloyed Steel
Thermal simulation test, TEM(Transmission Electron Microscope) and nanobeam EDS techniques were used to investigate the dissolving and precipitation behavior in Nb-bearing mciroalloyed steel. The experimental results indicate that: there are two families of precipitates in the as forged samples. The larger precipitates of Nb(C,N) disappear after being held for 2h at 1300°C,while the inclusions of MnS formed from the solidification even remain for 48h held at that temperature. After 30% of predeformtion at 850°C and 900°C, the strain-induced precipitation occurs, that is, the other tiny precipitates. Compared with the samples relaxed at 850°C, the ones that are held at 900°C show larger particles by same holding time but demonstrate the same size when the relaxation time reaches 1000s.
Yongping Zhang, Linhua Zhou and Elwin Mao
S. Q. Yuan et al., "Investigation on Dissolving and Strain Induced Precipitation Behavior in Nb-Bearing Microalloyed Steel", Applied Mechanics and Materials, Vol. 109, pp. 3-6, 2012