Fatigue inhomogeneity of 140 mm thick TC4 titanium alloy double-sided electron beam welded joints

Long, Jian; Jia, Jin-Long; Zhang, Linjie; Zhuang, Mingxiang; Wu, Jiu Hui

doi:10.1016/j.ijfatigue.2022.107214

Cited by 11 publications

(3 citation statements)

References 18 publications

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“…S max is the maximum stress, A is the fatigue strength coefficient, N f is the cycle of failure, and b is the fatigue strength index [33]. As shown in Figure 7, the corresponding fitting formula for fatigue strength was obtained, with the expression:…”

Section: Fatigue Performance and Fatigue Behaviormentioning

confidence: 99%

The Effect of Dendritic Structure and Secondary Phases on the Fatigue Behavior of ERNiCrMo-3 Weld Metal

Zhang,

Ji,

et al. 2023

Preprint

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The effect of dendritic structure and secondary phases on the fatigue crack propagation mechanism of ERNiCrMo-3 weld metal was investigated in the present study. Element segregation in the weld metal caused severe lattice distortion in the interdendritic region, which led to the instability of crack propagation rates, resulting in considerable differences in mechanical properties between the dendrite core and interdendritic region. The limited plastic deformation capability of the interdendritic region caused the contraction of the local plastic deformation zone at the crack tip, which increased stress concentration and accelerated crack propagation. Meanwhile, element segregation promoted the precipitation of a large number of Laves pahse in the interdendritic region. The interaction between dislocations and Laves phase was enhanced as the stress increased, which generated micro-voids and provided fast channels for fatigue crack propagation. Post-weld heat treatment weakened the non-uniformity of the microstructure and the fatigue crack showed a stable propagation trend. Moreover, the dissolution of Laves phase and the precipitation of γ” enhanced the fatigue property of the weld metal.

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Section: Fatigue Performance and Fatigue Behaviormentioning

confidence: 99%

The Effect of Dendritic Structure and Secondary Phases on the Fatigue Behavior of ERNiCrMo-3 Weld Metal

Zhang,

Ji,

et al. 2023

Preprint

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“…Currently, electron beam welding (EBW) has been commonly applied to join titanium alloy thick plates [8][9][10][11][12]. EBW technology with the high energy density, higher depth-to-width ratio and fast welding speed can achieve the deep penetration of titanium alloy thick plates via single-sided welding, largely improving the welding quality and efficiency compared to the conventional fusion welding methods.…”

Section: Introductionmentioning

confidence: 99%

Influencing mechanisms of weld root tip on microstructure and mechanical properties of electron beam welded joints of titanium alloy thick plates

Li,

Wu,

Zhao

et al. 2023

Science and Technology of Welding and Joining

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The welding of titanium alloy thick plates often formed a narrow weld seam in the weld root, named as 'weld root tip', because of insufficient fusion, which could reduce the joint properties. In this study, 30 mm-thick Ti-5Al-5Mo-5V-1Cr-1Fe alloy was butt welded via electron beam welding to reveal the influencing mechanisms of the weld root tip on joint microstructure and mechanical properties. The subparallel or parallel weld seam with the weld angles of 0°-3°between the centre line and edge of the fusion zone removed the weld root tip, achieving almost the same mechanical properties with those of the welding zone.

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“…Due to their large size, these structural components cannot be forged as a whole, so welding technology is particularly important. However, previous studies indicate that the existing manufacturing process of thick Ti-6Al-4V alloy parts has exposed several technical limits, such as the suppression of welding defects and the deformation controlling in the forming process [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Interlaminar Microstructure and Mechanical Properties of Narrow Gap Laser Welding of 40-mm-Thick Ti-6Al-4V Alloy

Liu

Ling

et al. 2022

Materials

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Narrow gap laser welding (NGLW) is a common solution for the welding of thick structures. NGLW was carried out on narrow-gap butt joints of 40 mm-thick Ti-6Al-4V alloy plates with a U-shaped groove. The distribution characteristics of the interlaminar microstructure in different height ranges of the joint were investigated, and the evolution behavior and formation mechanism of the interlaminar microstructure of the joint were also revealed. This showed that a large amount of short needle martensite nucleated and grew up near the fusion line and the upper boundary of the remelting zone. The “softening” phenomenon occurred in all welds except the cover layer weld. The microstructure evolution and defect migration, induced by multiple welding thermal cycles in the upper weld forming process, were the main reasons for the “softening” of the lower weld. The tensile strength of each sample changed in the range of 920~990 MPa; the fracture mode of the sample belongs to a transgranular ductile fracture. In addition, compared with the upper part of the joint, the plasticity and toughness of the weld area in the lower part of the joint was improved.

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Fatigue inhomogeneity of 140 mm thick TC4 titanium alloy double-sided electron beam welded joints

Cited by 11 publications

References 18 publications

The Effect of Dendritic Structure and Secondary Phases on the Fatigue Behavior of ERNiCrMo-3 Weld Metal

The Effect of Dendritic Structure and Secondary Phases on the Fatigue Behavior of ERNiCrMo-3 Weld Metal

Influencing mechanisms of weld root tip on microstructure and mechanical properties of electron beam welded joints of titanium alloy thick plates

Interlaminar Microstructure and Mechanical Properties of Narrow Gap Laser Welding of 40-mm-Thick Ti-6Al-4V Alloy

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