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Web of Proceedings - Francis Academic Press
Web of Proceedings - Francis Academic Press

A Review of Research on DP780 Welded Joint Microstructure and Mechanical Properties

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DOI: 10.25236/iwmecs.2019.107

Author(s)

Zhao Zhenzhen, Guo Yonghuan, Lu Weihao, Wang Saibo

Corresponding Author

Guo Yonghuan

Abstract

Dual phase (DP) high strength steel have excellent performance of stamping and forming, and has been widely applied in the field of automobile and aerospace. Among them, high strength and good ductility makes DP780 become the ideal material for the auto body, but in the welding process, high strength steels will produce brittle hard weld microstructure, which affects the mechanical properties of the welded joints. Through the domestic and international review about present situation and the measures in DP780 welded joint, the results show that most of the research is to improve the welded joint of DP780 by changing the inclusion density and the heat treatment method, distributing the solder joint reasonably or adding preheating current to change the mechanical properties.

Keywords

DP780, microstructure, mechanical properties, welded joints