Effect of Combined Addition of Niobium and Boron on Thermomechanically Processed Steel
-
- TAMEHIRO Hiroshi
- Kimitsu R&D Lab., Nippon Steel Corp.
-
- MURATA Masahiko
- Kimitsu R&D Lab., Nippon Steel Corp.
-
- HABU Ryuichi
- Kimitsu R & D Lab., Nippon steel Corp.
-
- NAGUMO Michihiko
- R & D Laboratories-I, Nippon Steel Corp.
Bibliographic Information
- Other Title
-
- 制御圧延-加速冷却鋼におけるNb-B複合添加の効果
- セイギョ アツエン カソク レイキャク コウ ニ オケル Nb B
Search this article
Abstract
In the thermomechanical control process (TMCP) with accelerated cooling, the effect of the combined addition of boron with a grain-refining element, niobium, vanadium or titanium, on the mechanical properties and microstructures of low-carbon steels was studied. It was found that although the single addition of boron has little effect on the steel properties, the combined niobium-boron addition conspicuously improves the strength and toughness balance. In the case of the single addition of boron, coarse Fe23(CB)6 precipitates at γ-grain boundaries after rolling, and the γ-α transformation suppressing effect by boron is remarkably weakened. Niobium addition to boron steel has the effect of suppressing the precipitation of Fe23(CB)6 and strongly retards the γ-α transformation, and hence produces a fine-grained bainitic structure. Titanium has the same effect as that of niobium, but vanadium does not. The strengthening and toughening mechanism of steels by the combined niobium-boron addition was also discussed by examining the effect of alloying elements on the recrystallization stop temperature of γ during rolling, γ-α transformation behavior and so on.
Journal
-
- Tetsu-to-Hagane
-
Tetsu-to-Hagane 72 (3), 458-465, 1986
The Iron and Steel Institute of Japan
- Tweet
Keywords
Details 詳細情報について
-
- CRID
- 1390282680160718336
-
- NII Article ID
- 110001870570
-
- NII Book ID
- AN00151251
-
- ISSN
- 18832954
- 00211575
-
- NDL BIB ID
- 3070478
-
- Data Source
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- Abstract License Flag
- Disallowed