Improvement of Charpy impact properties in heat affected zones of API X80 pipeline steels containing complex oxides

被引：9

作者：

Shin, S. Y. ^{[1
]}

Oh, K. ^{[2
]}

Kang, K. B. ^{[3
]}

Lee, S. ^{[1
]}

机构：

[1] Pohang Univ Sci & Technol, Ctr Adv Aerosp Mat, Pohang 790784, South Korea

[2] POSCO, Tech Res Labs, Steelmaking Res Grp, Pohang 790785, South Korea

[3] POSCO, Tech Res Labs, Steel Solut Res Grp, Pohang 790785, South Korea

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2010年 / 26卷 / 09期

关键词：

API X80 pipeline steel; Heat affected zone; Complex oxides; ACICULAR FERRITE; LOW-CARBON; HIGH-STRENGTH; MICROSTRUCTURES; BEHAVIOR;

D O I：

10.1179/174328409X425218

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The present study aimed at investigating the improvement of Charpy impact properties in heat affected zones (HAZs) of API X80 pipeline steels containing complex oxides. Three kinds of steels were fabricated by adding Ti, Al and Mg to form complex oxides and their microstructures, tensile properties and Charpy impact properties were investigated. The number of complex oxides increased as the excess amount of Ti, Al and Mg was included in the steels. After the HAZ simulation test, the steel having a number of oxides contained about 72 vol.-% of acicular ferrite in the simulated HAZ, together with bainitic ferrite and granular bainite, whereas the HAZ microstructures of the conventional steels consisted of bainitic ferrite and granular bainite with a small amount of acicular ferrite. The volume fraction of acicular ferrite increased as the amount of complex oxides increased and the heat input decreased, and thus, Charpy impact properties of the oxide containing steel HAZs were greatly improved over those of the conventional steel HAZs.

引用

页码：1049 / 1058

页数：10

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