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Influence of Nonuniform Microstructure on High‐Cycle Fatigue Properties of the Electron‐Beam‐Welded Joint of High‐Strength Steel by Hongyuan Wan; Lihang Li; Zexin Zhang; Hao Dai; Xunyan Jiang; Pengfei Fu is a Engineering article available to read on EtoBox.

What is Influence of Nonuniform Microstructure on High‐Cycle Fatigue Properties of the Electron‐Beam‐Welded Joint of High‐Strength Steel about?

The relatively weak fatigue property of electron beam (EB)-welded joints is one of the key issues restricting their wide application. This study investigates the impact of accelerating voltage, specifically the process-induced non-uniform microstructure, on the high-cycle fatigue properties of 15CrMnMoVA steel EB-welded joints. The results indicate that increasing the accelerating voltage from 120 kV to 150 kV (150-specimen) results in a longer fatigue life and an 11.8% improvement in fatigue limit for the welded joint with the locking bottom structure. However, even after removing the locking bottom structure, the fatigue life of the 150-specimen is still inferior to that of the base metal. The shorter fatigue life is primarily due to stress concentration and premature fatigue failure caused by the non-uniform distribution of grain size and crystallographic orientation across the EBwelded joint. Thus, further optimization of the welding process is necessary to improve the fatigue reliability of EB-welded joints by obtaining a more uniform microstructure.

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Author

Hongyuan Wan; Lihang Li; Zexin Zhang; Hao Dai; Xunyan Jiang; Pengfei Fu

Publisher

Wiley

Published

2023

Language

EN

Field

Engineering (Physical Sciences)