Alloying element accumulation at ferrite/austenite boundaries below the time-temperature-transformation diagram bay in an Fe-C-Mo Alloy

被引：36

作者：

Enomoto, M

Maruyama, N

Wu, KM

Tarui, T

机构：

[1] Ibaraki Univ, Dept Mat Sci, Hitachi, Ibaraki 3168511, Japan

[2] Nippon Steel Corp Ltd, Steel Res Labs, Futtsu, Chiba 2938511, Japan

[3] Univ Sci & Technol Beijing, Beijing 100083, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2003年 / 343卷 / 1-2期

关键词：

steels; ferrite; interfacial segregation; solute drag; molybdenum;

D O I：

10.1016/S0921-5093(02)00375-1

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A scanning transmission electron microscope (STEM)-energy dispersive X-ray (EDX) analysis was made of the Mo concentration at boundaries between degenerate ferrite and austenite in an Fe-0.28mass%C-3mass%Mo alloy isothermally reacted below the bay temperature of the time-temperature-transformation (TTT)-diagram. The measured Mo concentration scattered widely from one boundary to another and varied considerably along the individual boundaries. The enrichment factor of Mo corrected for the sampling volume (beam diameter) to boundary thickness ratio showed an increasing tendency with isothermal holding time and reached as large as 15 when the alloy entered the transformation stasis. The amount of Mo in the boundary is compared with that calculated under the assumption of quasi-steady state diffusion that is used to analyze the solute drag effects on the motion of interphase boundaries. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：151 / 157

页数：7

共 25 条

[1] BAINITE VIEWED 3 DIFFERENT WAYS [J].

AARONSON, HI ;

REYNOLDS, WT ;

SHIFLET, GJ ;

SPANOS, G .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1990, 21 (06) :1343-1380

[2] BAINITE IN STEELS [J].

BHADESHIA, HKDH ;

CHRISTIAN, JW .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1990, 21 (04) :767-797

[3] BAINITE TRANSFORMATION IN A SILICON STEEL [J].

BHADESHIA, HKDH ;

EDMONDS, DV .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1979, 10 (07) :895-907

[4]

Boswell P.G., 1986, MECH PROPERTIES PHAS, P445

[5] Influence of solute drag on the growth of proeutectoid ferrite in Fe-C-Mn alloy [J].

Enomoto, M .

ACTA MATERIALIA, 1999, 47 (13) :3533-3540

[6] CALCULATION OF ALPHA+GAMMA-PHASE BOUNDARIES IN FE-C-X SYSTEMS FROM THE CENTRAL ATOMS MODEL [J].

ENOMOTO, M ;

AARONSON, HI .

CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY, 1985, 9 (01) :43-58

[7] EVALUATION OF THE EFFECTS OF SEGREGATION ON AUSTENITE GRAIN-BOUNDARY ENERGY IN FE-C-X ALLOYS [J].

ENOMOTO, M ;

WHITE, CL ;

AARONSON, HI .

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1988, 19 (07) :1807-1818

[8] A STEM method for investigating alloying element accumulation at austenite-ferrite boundaries in an Fe-C-Mo alloy [J].

Fletcher, HA ;

Garratt-Reed, AJ ;

Aaronson, HI ;

Purdy, GR ;

Reynolds, WT ;

Smith, GDW .

SCRIPTA MATERIALIA, 2001, 45 (05) :561-567

[9]

FRIEDBERG J, 1969, JERNKONT ANN, V153, P263

[10]

Heheman RF, 1970, PHASE TRANSFORMATION, P397

← 1 2 3 →