The dissolution and the precipitation kinetics of Nb(C,N) particles in both strain-free and strained austenite of a low-carbon Nb-microalloyed steel were investigated using electrical resistivity, interrupted compression, and electrolytic dissolution methods as well as transmission electron microscopy (TEM). The dissolution temperature of the 0.08C-0.038Nb steel was determined to be about 1230 °C for 600 seconds using electrical resistivity method and was confirmed by TEM. With increasing strain, the isothermal precipitation kinetics of Nb(C,N) was accelerated and the particle distribution became more random. The precipitation-time-temperature diagrams of the Nb(C,N) precipitates in strain-free and strained austenite were generated between 850 °C and 950 °C. The nose temperatures for both diagrams were about 900 °C. Compared to the electrolytic dissolution method, the interrupted compression and electrical resistivity methods show more reasonable strain-induced precipitation kinetics. The electrical resistivity method has wider applications to the dissolution and precipitation kinetics in microalloyed steels.
|Number of pages||9|
|Journal||Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science|
|Publication status||Published - 2009|
Bibliographical noteFunding Information:
This work was performed by a grant-in-aid for the National Core Research Center Program from MOST and KOSEF (Grant No. R15-2006-022-01002-0) and also with financial and materials supports from Baosteel Co. The authors are thankful to Professor C.J. Van Tyne, Colorado School of Mines, for helpful discussions.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys