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

doi:10.1016/j.msea.2022.142752

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

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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 language	English
Article number	142752
Journal	Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
DOIs	https://doi.org/10.1016/j.msea.2022.142752
Publication status	Published - 31 Jan 2022

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Wu, Z., Liu, S., Yang, Z., Zhou, H., Li, Q. B. E., Pan, H., Chen, Y., Lu, L., & Liu, L. (2022). Simultaneously improved the strength dramatically and eliminated HAZ softening of DP980 steel pulsed-arc welding joints by PWHT. Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, Article 142752. https://doi.org/10.1016/j.msea.2022.142752

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

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.",

author = "Zhiqiang Wu and Shuai Liu and Zhibin Yang and Honggang Zhou and Li, {Quan Bing Eric} and Haijun Pan and Yini Chen and Liwei Lu and Longfei Liu",

year = "2022",

month = jan,

day = "31",

doi = "10.1016/j.msea.2022.142752",

language = "English",

journal = "Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing",

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T1 - Simultaneously improved the strength dramatically and eliminated HAZ softening of DP980 steel pulsed-arc welding joints by PWHT

AU - Wu, Zhiqiang

AU - Liu, Shuai

AU - Yang, Zhibin

AU - Zhou, Honggang

AU - Li, Quan Bing Eric

AU - Pan, Haijun

AU - Chen, Yini

AU - Lu, Liwei

AU - Liu, Longfei

PY - 2022/1/31

Y1 - 2022/1/31

N2 - 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.

AB - 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.

U2 - 10.1016/j.msea.2022.142752

DO - 10.1016/j.msea.2022.142752

M3 - Article

SN - 0921-5093

JO - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

M1 - 142752

ER -

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

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