Effect of the additional heat input on the microstructure and property in NiCrMoV welded joint simulated by multiple thermal cycles

[Display omitted] •The repair welding could be successfully simulated by Gleeble simulation.•The hardness in pre-HAZ did not exceed the previous hardness range for each joint.•The reliable property was anticipated for this joint after additional heat input. The effect of additional heat input on the...

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Bibliographic Details
Published in:Journal of materials processing technology 2020-10, Vol.284, p.116740, Article 116740
Main Authors: Zhang, Yuanheng, Ding, Kai, Huo, Xin, Zhao, Bingge, Fan, Manjie, Zhang, Yanbin, Wang, Yuanfang, Wei, Tao, Wu, Guanzhi, Gao, Yulai
Format: Article
Language:English
Subjects:
Heat affected zone
Heat input
Heat treating
Heating
Microhardness
Microstructure
Microstructure evolution
NiCrMoV steel
Post-weld heat treatment
Repair welding
Temperature effects
Tempered martensite
Thermal simulation
Weld metal
Welded joint
Welded joints
Weldments
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Summary:[Display omitted] •The repair welding could be successfully simulated by Gleeble simulation.•The hardness in pre-HAZ did not exceed the previous hardness range for each joint.•The reliable property was anticipated for this joint after additional heat input. The effect of additional heat input on the NiCrMoV weldments via thermal cycles was comparatively investigated. After thermal effect with one to three cycles and post-weld heat treatment (PWHT), no obvious changes in the microhardness and microstructure were detected in the weldments except a hardness-increased zone formed within the original weld metal (WM), which was designated as the present heat-affected zone (pre-HAZ). Compared with the tempered martensite in the as-welded WM, the tempered lath martensite with dispersed second phase particles was revealed in the pre-HAZ rooted in the original WM. Though the pre-HAZ showed larger hardness owing to microstructure change by rapid cooling during thermal simulation, yet the microhardness in this zone still did not exceed previous hardness range for each specimen. It could be concluded that the microstructure in WM remained stable and the reliable property was anticipated for this weldment even experienced further reheating e.g. repair welding process.
ISSN:0924-0136
1873-4774
DOI:10.1016/j.jmatprotec.2020.116740