Simultaneously improved the strength dramatically and eliminated HAZ softening of DP980 steel pulsed-arc welding joints by PWHT

Zhiqiang Wu, Shuai Liu, Zhibin Yang, Honggang Zhou, Quan Bing Eric Li, Haijun Pan, Yini Chen, Liwei Lu, Longfei Liu

Research output: Contribution to journalArticlepeer-review

Abstract

A pathway of post-weld heat treatment (PWHT) to eliminate heat affected zone (HAZ) softening and improve the strength of the welded joints of DP980 steel was developed. It is found that the high temperature isothermal transition at 750–950 °C followed by water-quenching significantly influences the strength and fracture location by changing the microstructures of the welded joint. The block martensite is distributed discretely in the island ferrite after PWHT, which causes ferrite to deform continuously in space. At the same time, the microstructure of joints is more uniform after PWHT. As a result, the highest strength (1146 MPa) can be obtained by PWHT at 950 °C, which is about 1.35 times that of the as-welded joint.
Original languageEnglish
Article number142752
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
DOIs
Publication statusPublished - 31 Jan 2022

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