期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.07.046
关键词
Electron microscopy; Martensite; Steel; Coarsening; Precipitation
类别
资金
- Russian Science Foundation [14-29-00173]
- Russian Science Foundation [14-29-00173] Funding Source: Russian Science Foundation
The precipitation of the Laves-phase in a low-carbon 9% Cr heat resistant steel was studied under conditions of aging and creep at 923 K. The Laves-phase of Fe-2(W,Mo)-type with a ratio of Mo:W of 1:5 was observed on various boundaries in a tempered martensite structure after a long period of aging/creep. The Laves-phase precipitations provided effective stabilization of the tempered martensite lath structure and therefore promoted creep resistance, although their effect on the dislocation substructure was negligibly small. The mean size of the Laves-phase particles (D) gradually increased with aging/creep time (tau) and could be expressed as D-4-D-0(4) = K tau, were K = 5 x 10(-34) m(4)/s for aging and K = 13 x 10(-34) m(4)/s for creep. The large Laves-phase particles, which coarsened during the creep tests, served as preferential sites for pore and crack nucleation leading to fracture. (C) 2014 Elsevier B.V. All rights reserved.
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