Laves-phase precipitates in a low-carbon 9% Cr martensitic steel during aging and creep at 923 K

被引：95
作者：
Fedorova, I. [1 ]
Belyakov, A. [1 ]
Kozlov, P. [2 ]
Skorobogatykh, V. [2 ]
Shenkova, I. [2 ]
Kaibyshev, R. [1 ]
机构：
[1] Belgorod State Univ, Belgorod 308015, Russia
[2] Cent Res Inst Machine Bldg Technol, Moscow 115088, Russia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 615卷
基金：
俄罗斯科学基金会;
关键词：
Electron microscopy; Martensite; Steel; Coarsening; Precipitation; HEAT-RESISTANT STEEL; POWER-PLANTS; MICROSTRUCTURAL EVOLUTION; STRENGTHENING MECHANISMS; 10-PERCENT-CR STEEL; STRUCTURAL-CHANGES; MX CARBONITRIDES; 9CR STEEL; BEHAVIOR; RATES;
D O I：
10.1016/j.msea.2014.07.046
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：153 / 163
页数：11
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