Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 42A, Issue 13, Pages 3952-3960Publisher
SPRINGER
DOI: 10.1007/s11661-011-0783-z
Keywords
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Funding
- National Natural Science Foundation of China [50931003, 51001067]
- Shanghai Committee of Science and Technology [09520500100, 10PJ1403900]
- Shu Guang Project [09SG36]
- Shanghai Municipal Education Commission [10ZZ62]
- Shanghai Leading Academic Discipline Project [S30107]
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The three-dimensional atom probe (3DAP) is used to characterize the solute behavior at the initial nucleation stage of carbide that precipitates in a quench-temper processed multicomponent V-Nb microalloyed steel. The equilibrium (V,Nb)C phase does not precipitate directly from the ferrous matrix with martensite structure, whereas it is preceded by the formation of isostructural diffuse atmosphere, Fe-depleted V-Nb cluster, and metastable phase (Fe,V,Nb)C successively. The transient phases are considered to largely reduce the required high energy, which is often accompanied by the appearance of the fresh incoherent carbide/matrix boundary. During the evolution of these phases, vanadium and niobium diffuse to the previously existing carbon-enriched cluster concurrently but with different mobilities from the aspect of the kinetic pathway, leading to heterogeneous distribution of solutes in the transient phases.
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