Investigation on LCF Behavior of Welded Joint at Different Temperatures for Bainite Steel

Xu, Ke; Xiongfei, Wang; Cui, Haichao; Lu, Fenggui

doi:10.1186/s10033-019-0346-6

Cited by 3 publications

(1 citation statement)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, Lan et al 24) reported the optimal range of the size distribution of non-metallic inclusions formed in the weld metal and the essential causes of a deteriorated HAZ toughness. Many authors [25][26][27] reported that the presence of inclusions in welding joints, especially in HAZ, is due to various factors.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of the Inclusion Behavior during AC Flash Butt Welding

2020

View full text Add to dashboard Cite

The entrapment of inclusions in the solidified weld zone is detrimental to its mechanical properties. In an AC flash welding process, the upsetting rate, the initial temperature of the weld pool, and the size of inclusions may affect the final distribution of the inclusions. Additionally, the concentration of sulfur may induce Marangoni convection in the weld pool, which possibly affects the pushing and engulfment of inclusions by the solid at the solid-liquid interface. In the present work, a two-dimensional numerical model based on Computational Fluid Dynamics (CFD) has been developed to investigate the behavior of alumina inclusions during the AC flash welding of a thin SPFH590 steel plate. The Volume of Fluid (VOF) numerical model was coupled with the dynamic mesh model for the motion of plates, discrete phase for inclusion particles and solidification model. The simulation results show that the upsetting parameters significantly affect the overall inclusion motion. A high upsetting rate pushes the inclusions away from the welded joint. The high initial flash temperature does not affect the removal of inclusions from the weld zone. A similar outcome has been noted with respect to the increase in the diameter of the inclusions. Furthermore, the predicted results show that inclusions are prone to engulfment by the solidification front under the influence of higher interfacial tension between the inclusions and melt. Nevertheless, the inclusion displacement under the influence of an interfacial tension gradient is diminutive because of the rapid solidification rate of the weld pool.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of the Inclusion Behavior during AC Flash Butt Welding

2020

View full text Add to dashboard Cite

show abstract

DIC-aided analysis of the fatigue behaviour of a welded 316L stainless steel

2022

View full text Add to dashboard Cite

Effect of Interface Form on Creep Failure and Life of Dissimilar Metal Welds Involving Nickel-Based Weld Metal and Ferritic Base Metal

Li,

Nie,

Wang

et al. 2024

Chin. J. Mech. Eng.

View full text Add to dashboard Cite

For dissimilar metal welds (DMWs) involving nickel-based weld metal (WM) and ferritic heat resistant steel base metal (BM) in power plants, there must be an interface between WM and BM, and this interface suffers mechanical and microstructure mismatches and is often the rupture location of premature failure. In this study, a new form of WM/BM interface form, namely double Y-type interface was designed for the DMWs. Creep behaviors and life of DMWs containing double Y-type interface and conventional I-type interface were compared by finite element analysis and creep tests, and creep failure mechanisms were investigated by stress-strain analysis and microstructure characterization. By applying double Y-type interface instead of conventional I-type interface, failure location of DMW could be shifted from the WM/ferritic heat-affected zone (HAZ) interface into the ferritic HAZ or even the ferritic BM, and the failure mode change improved the creep life of DMW. The interface premature failure of I-type interface DMW was related to the coupling effect of microstructure degradation, stress and strain concentrations, and oxide notch on the WM/HAZ interface. The creep failure of double Y-type interface DMW was the result of Type IV fracture due to the creep voids and micro-cracks on fine-grain boundaries in HAZ, which was a result of the matrix softening of HAZ and lack of precipitate pinning at fine-grain boundaries. The double Y-type interface form separated the stress and strain concentrations in DMW from the WM/HAZ interface, preventing the trigger effect of oxide notch on interface failure and inhibiting the interfacial microstructure cracking. It is a novel scheme to prolong creep life and enhance reliability of DMW, by means of optimizing the interface form, decoupling the damage factors from WM/HAZ interface, and then changing the failure mechanism and shifting the failure location.

show abstract

Investigation on LCF Behavior of Welded Joint at Different Temperatures for Bainite Steel

Cited by 3 publications

References 37 publications

Numerical Modeling of the Inclusion Behavior during AC Flash Butt Welding

Numerical Modeling of the Inclusion Behavior during AC Flash Butt Welding

DIC-aided analysis of the fatigue behaviour of a welded 316L stainless steel

Effect of Interface Form on Creep Failure and Life of Dissimilar Metal Welds Involving Nickel-Based Weld Metal and Ferritic Base Metal

Contact Info

Product

Resources

About