Selective Oxidation during the Austenitic Annealing of a CMnSi Steel

被引：11

作者：

Van De Putte, T. ^{[1
]}

Zermout, Z. ^{[2
]}

Loison, D. ^{[3
]}

Claessens, S. ^{[2
]}

Penning, J. ^{[1
]}

机构：

[1] Univ Ghent, Dept Met & Mat Sci, Technol Pk 903, B-9052 Ghent, Belgium

[2] Ctr Ind Res, OCAS NV ARCELOR, B-9060 Zelzate, Belgium

[3] Arcelor Res SA, Maizieres les Metz, F-57283 Paris, France

来源：

THERMEC 2006 SUPPLEMENT: 5TH INTERNATIONAL CONFERENCE ON PROCESSING AND MANUFACTURING OF ADVANCED MATERIALS | 2007年 / 15-17卷

关键词：

Selective oxidation; XPS; Surface state; Austenite;

D O I：

10.4028/www.scientific.net/AMR.15-17.129

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

High strength multiphase CMnSi steel is increasingly used in passenger cars. Si and Mn alloying levels are typically in the range of 1-2% in mass. While Si improves the mechanical properties, it considerably deteriorates the galvanisability of steel. Residual water vapour in the reducing gas atmosphere during the intercritical or austenitic annealing results in the selective oxidation of Si and Mn at the steel surface. Besides Mn and Si, C is oxidized as well at the steel surface, leading to the formation of CO gas and decarburisation of the steel surface. This decarburisation has a major influence on the phase composition in the steel surface region: it shifts the ferrite to austenite transformation to higher annealing temperatures, leading to differences in surface and bulk microstructure. The phase composition influences the solubility and diffusivity of all alloying elements near the surface. The evolution with temperature of the selective oxidation at the steel surface has been studied by interrupted annealing in a protective atmosphere containing residual water vapour. The influence of the annealing temperature on the selective oxidation of Mn and Si is characterized by XPS (X-ray Photo-electron Spectroscopy) analysis.

引用

页码：129 / 134

页数：6

共 9 条

[1]

Drillet P., 2004, GALV 2004 P, P1123

[2] Thermochemical surface treatment of iron-silicon and iron-manganese alloys [J].

Eynde, XV ;

Servais, JP ;

Lamberigts, M .

SURFACE AND INTERFACE ANALYSIS, 2002, 33 (04) :322-329

[3]

EYNDE XV, 2004, GALV 04 C P CHIC

[4]

EYNDE XV, 2001, GALV 01 C P BRUSS, P187

[5] Galvanizability of high-strength steels for automotive applications [J].

Mahieu, J ;

Claessens, S ;

De Cooman, BC .

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2001, 32 (11) :2905-2908

[6]

Mahieu J., 2004, GALV 2004 P, P529

[7]

MAHIEU J, 2001, GALVATECH 2001 JUN, P644

[8]

MATAIGNE JM, 1992, DEVELOPMENTS IN THE ANNEALING OF SHEET STEELS, P511

[9]

WAGNER C, 1959, Z ELEKTROCHEM, V63, P772

← 1 →