Microstructure evolution and stress corrosion cracking sensitivity of friction stir welded high strength AA7085 joint

Xu, Wei; Lu, Hongjian; Li, X.H.; Wang, M.; Ma, Jun; Luo, Yuxuan

doi:10.1016/j.matdes.2021.110297

Cited by 19 publications

(2 citation statements)

References 34 publications

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“…The crack characteristics can be either embedded crack or penetrated crack, as depicted in Figure 2A–A. In conclusion, the formation of welding hot cracking is caused by the combination of metallurgical and mechanical factors 17–19 …”

Section: Resultsmentioning

confidence: 89%

“…In conclusion, the formation of welding hot cracking is caused by the combination of metallurgical and mechanical factors. [17][18][19] To determine the mechanical conditions of cracking formation of NS1402, the relationship between temperature and plasticity of weld within BTR is illustrated in Figure 2B. In the cooling process, the solidifying metal tends to contract due to both solidification shrinkage and thermal contraction.…”

Section: Forming Mechanism Of Hot Crackingmentioning

confidence: 99%

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Welding hot cracking characteristics and fracture mechanisms of nickel‐based alloy NS1402 under different constraint conditions

Zhou,

Huang,

Zheng

et al. 2023

Fatigue Fract Eng Mat Struct

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The influence of trace elements variation and constraint conditions on welding hot cracking was investigated to reveal the cracking characteristics of nickel‐based alloy NS1402. The fishbone tests and full restraint welding tests have been conducted to determine the cracking ratio. The mechanical and metallurgical fracture mechanisms were elaborated simultaneously. And the low‐melting point liquid membrane, which was a key metallurgical factor, was found in cracking fracture surface. Numerical simulations were conducted to illustrate the effects of transverse tensile stress/strain during welding processing. Results show that the liquid membranes were composed of FeNi, FeP, Co3Fe7, etc., indicating that liquid membranes were developed to higher melting point by Co3Fe7 eutectics due to the addition of Co, and it contributes to reducing cracking susceptibility of NS1402. The cracking was ductility‐dip cracking (DDC), which propagated in the forms of intergranular or transgranular fracture. Thus, adjusting element content and degrees of constraint could control the cracking tendency.

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Section: Resultsmentioning

confidence: 89%

Section: Forming Mechanism Of Hot Crackingmentioning

confidence: 99%

Welding hot cracking characteristics and fracture mechanisms of nickel‐based alloy NS1402 under different constraint conditions

Zhou,

Huang,

Zheng

et al. 2023

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

Improved Tensile Strength and SCC Resistance via Nonisothermal Creep Aging under a High Stress Level

Yi,

Xu,

Tang

et al. 2024

Adv Eng Mater

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Compared with conventional isothermal creep aging, non‐isothermal creep aging does not involve a prolonged holding stage, but only has heating and cooling stages. During the non‐isothermal creep aging process, the precipitates nucleate and grow up in the early part of heating stage, resulting in fluctuations in creep rate and an increase in strength. The coarsening of precipitates in the later part of the heating stage, can lead to significantly increase of creep rate. Upon approaching the peak temperature, the dissolution of the precipitates occurs in conjunction with a partial coarsening of the remaining precipitates, causing a reduction in strength. However, the secondary precipitation during the cooling stage facilities a significant strength enhancement in a relatively shorter period. In contrast to the isothermal creep aging, the targeted non‐isothermal creep aging treatment gives an increase in ultimate strength while improves the stress corrosion cracking resistance. Moreover, the time required for non‐isothermal creep aging to obtain ultimate strength is only 13.9 % of that of the ICA treatment. A large amount of creep strain can be generated during the NICA process, which is equivalent to 630 % of that of creep age forming treatment.This article is protected by copyright. All rights reserved.

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Effect of Overlaying Welding Repair on Stress Corrosion Cracking Sensitivity of Low-Pressure Nuclear Steam Turbine Rotor in the Simulated Environment

Huang

Song

Xuan

et al. 2022

J. of Materi Eng and Perform

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Microstructure evolution and stress corrosion cracking sensitivity of friction stir welded high strength AA7085 joint

Cited by 19 publications

References 34 publications

Welding hot cracking characteristics and fracture mechanisms of nickel‐based alloy NS1402 under different constraint conditions

Welding hot cracking characteristics and fracture mechanisms of nickel‐based alloy NS1402 under different constraint conditions

Improved Tensile Strength and SCC Resistance via Nonisothermal Creep Aging under a High Stress Level

Effect of Overlaying Welding Repair on Stress Corrosion Cracking Sensitivity of Low-Pressure Nuclear Steam Turbine Rotor in the Simulated Environment

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