Effects of Nb on Microstructural Evolution and Mechanical Properties of Low-Carbon Cold-Rolled Dual-Phase Steels

被引：22

作者：

Song R. ^{[1
]}

Fonstein N. ^{[1
]}

Jun H.J. ^{[1
]}

Pottore N. ^{[1
]}

Bhattacharya D. ^{[1
]}

Jansto S. ^{[2
]}

机构：

[1] ArcelorMittal Global RandD, East Chicago, IN, 46312

[2] CBMM North America, Inc., Bridgeville, PA, 15017

来源：

Metallography, Microstructure, and Analysis | 2014年 / 3卷 / 03期

关键词：

Austenite formation; Coiling temperature; Dual-phase steel; Niobium; Recrystallization; Tensile properties;

D O I：

10.1007/s13632-014-0133-9

中图分类号：

学科分类号：

摘要：

The effects of Nb additions, up to 0.06%, on the microstructure and properties of dual-phase (DP) steels containing 0.08% C and 2.2% Mn, were evaluated after hot rolling at different coiling temperatures, and after intercritical annealing of cold-rolled steels. During hot rolling, Nb precipitation was promoted by higher coiling temperature. During annealing of cold-rolled steels, microstructural characterization revealed that recovery and recrystallization processes overlapped with austenite formation. The addition of Nb increased the ferrite recrystallization start temperature, but had no significant effect on the start temperature of austenite formation during heating. Nb additions accelerated austenite formation once the transformation started, and also resulted in the formation of a finer and more homogeneous microstructure after annealing. In comparison with the steel without Nb, the ultimate tensile strength increased with the addition of up to 0.04% Nb, whereas addition of 0.06% Nb did not further increase the strength level of cold-rolled DP steels. Hot rolling at lower coiling temperatures improved both the strength and the ductility of the Nb-containing DP steels after annealing. © 2014 Springer Science+Business Media New York and ASM International.

引用

页码：174 / 184

页数：10

共 24 条

[1]

Davies R.G., Influence of martensite composition and content on the properties of dual-phase steels, Metall. Trans. A, 9, 5, pp. 671-679, (1978)

[2]

Murari F.D., Melo T.M.F., Gonzalez B.M., Kinetics of strain aging in cold rolled low strength multiphase steel, ISIJ Int., 50, 3, pp. 463-468, (2010)

[3]

Peranio N., Li Y.J., Roters F., Raabe D., Microstructure and texture evolution in dual-phase steels: competition between recovery, recrystallization, and phase transformation, Mater. Sci. Eng. A, 527, 16-17, pp. 4161-4168, (2010)

[4]

Bhattacharya D., Fonstein N., Niobium bearing advanced sheet steels for automotive applications at ArcelorMittal, International Symposium on Nb-bearing Steel Technology Development, pp. 91-102, (2009)

[5]

Bleck W., Phiu-On K., Microalloying of cold-formable multi phase steel grades, Mater. Sci. Forum, 500-501, pp. 97-114, (2005)

[6]

Misra R.D.K., Nathani H., Hartmann J.E., Siciliano F., Microstructural evolution in a new 770 MPa hot rolled Nb-Ti microalloyed steel, Mater. Sci. Eng. A, 394, 1-2, pp. 339-352, (2005)

[7]

Bhattacharya D., Fonstein N., Girina O., Gupta I., Yakubovsky O., A family of 590 MPa, Advanced High Strength Steels with Various Microstructure, 45th Mechanical Working and Steel Processing Conference Proceedings, pp. 173-186, (2003)

[8]

Gupta C.K., Suri A.K., Extractive Metallurgy of Niobium, pp. 21-23, (1994)

[9]

Matlock D.K., Krauss G., Speer J.G., New microalloyed steel applications for the automotive sector, Mater. Sci. Forum, 500-501, pp. 87-96, (2005)

[10]

Mohrbacher H., Niobium alloyed high strength steels for automotive applications, Int. J. ISSI, 3, 1, pp. 13-19, (2006)

← 1 2 3 →