Solute Behavior in the Initial Nucleation of V- and Nb-Containing Carbide

Solute Behavior in the Initial Nucleation of V- and Nb-Containing Carbide
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含 V 和 Nb 碳化物初始成核过程中的溶质行为

DOI:
10.1007/s11661-011-0783-z
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发表时间:
2011-07
影响因子:
2.8
通讯作者:
S. J. Zhao
S. J. Zhao
中科院分区:
材料科学2区
文献类型:
--
作者:
Q. D. Liu;W. Q. Liu;S. J. Zhao

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用三维原子探针(3DAP)研究了调质处理的多元V-Nb微合金钢中碳化物析出初期形核阶段的溶质行为。(V,Nb)C相不是直接从马氏体型的铁素体中析出,而是相继形成等结构弥散气氛、贫铁V-Nb团簇和亚稳相(Fe,V,Nb)C。过渡相被认为大大降低了所需的高能,这通常伴随着新的非共格碳化物/基体边界的出现。在这些相的演化过程中,钒和铌同时扩散到先前存在的富碳团簇中,但从动力学途径上看,它们的迁移率不同,导致了过渡相中溶质的不均匀分布。
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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发表时间: 1989-12
期刊: Metallurgical Transactions A
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