Influence of the starting microstructure of an advanced high strength steel on the characteristics of Zn-Assisted liquid metal embrittlement

Bhattacharya, Diptak; Cho, Lawrence; Aa, Ellen van der; Pichler, A.; Pottore, Narayan; Ghassemi-Armaki, Hassan; Findley, Kip O.; Speer, John G.

doi:10.1016/j.msea.2020.140391

Cited by 41 publications

(20 citation statements)

References 36 publications

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“…Kang et al [408] stated that the LME mechanism might be controlled by stress-assisted diffusion and/or mass transport along GBs. LME caused by liquid Zn did not only affect the austenite phase, but also the ferrite phase was sensitive to liquid Zn-induced embrittlement, while differences in the initial steel microstructure, such as the presence of retained austenite, did not impact strongly the steel susceptibility to LME [407,417,418]. Razmpoosh et al [419] found that liquid Zn penetrated selectively into random high-angle GBs in 304 AuSS.…”

Section: New Understandings Of Lme In the Past Two Decadesmentioning

confidence: 99%

Environmental degradation of structural materials in liquid lead- and lead-bismuth eutectic-cooled reactors

Gong

Short

Auger

et al. 2022

Progress in Materials Science

195

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Section: New Understandings Of Lme In the Past Two Decadesmentioning

confidence: 99%

Environmental degradation of structural materials in liquid lead- and lead-bismuth eutectic-cooled reactors

Gong

Short

Auger

et al. 2022

Progress in Materials Science

195

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“…Scheiber et al [9] concluded from ab initio and thermodynamic modeling that the embrittling effect of Zn at different symmetrical body-centeredcubic (bcc)-Fe tilt GBs can be reduced by Al and Si, which is related to site-competition as well as repulsive interactions between the solutes and Zn. Although a large body of experimental and theoretical studies on LMIE exist, [21][22][23] a fundamental understanding on the relationships between the GB structure, Zn segregation and its impact on embrittlement is lacking. Especially, the role of interstitial solutes on the embrittlement of GBs by Zn has not been considered, while, for example, C and B are known to act as GB cohesion enhancers in Fe-based alloys.…”

Section: Introductionmentioning

confidence: 99%

Interstitial Segregation has the Potential to Mitigate Liquid Metal Embrittlement in Iron

Ahmadian

Scheiber

et al. 2023

Advanced Materials

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The embrittlement of metallic alloys by liquid metals leads to catastrophic material failure and severely impacts their structural integrity. The weakening of grain boundaries (GBs) by the ingress of liquid metal and preceding segregation in the solid are thought to promote early fracture. However, the potential of balancing between the segregation of cohesion‐enhancing interstitial solutes and embrittling elements inducing GB de‐cohesion is not understood. Here, the mechanisms of how boron segregation mitigates the detrimental effects of the prime embrittler, zinc, in a Σ5 [001] tilt GB in α‐Fe (4 at.% Al) is unveiled. Zinc forms nanoscale segregation patterns inducing structurally and compositionally complex GB states. Ab initio simulations reveal that boron hinders zinc segregation and compensates for the zinc‐induced loss in GB cohesion. The work sheds new light on how interstitial solutes intimately modify GBs, thereby opening pathways to use them as dopants for preventing disastrous material failure.

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“…The occurrence of tensile plastic strain combined with temperatures above 700 °C is used in the literature as a rule of thumb to estimate the risk of crack formation [ 7 , 8 , 9 , 10 ]. Other influences such as loading speed [ 11 ], microstructure and alloying metals are also reported to have an impact on LME susceptibility [ 12 , 13 ]. Different testing methods such as hot dip testing of cups with residual stresses [ 14 ], modified welding process parameters and welding tests with applied external tensile load [ 15 , 16 ], fracture mechanics testing [ 17 ] or hot tensile testing [ 18 , 19 , 20 ] have been proposed to investigate the influence of LME to steel.…”

Section: Introductionmentioning

confidence: 99%

Liquid Metal Embrittlement of Advanced High Strength Steel: Experiments and Damage Modeling

et al. 2021

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In the automotive industry, corrosion protected galvanized advanced high strength steels with high ductility (AHSS-HD) gain importance due to their good formability and their lightweight potential. Unfortunately, under specific thermomechanical loading conditions such as during resistance spot welding galvanized, AHSS-HD sheets tend to show liquid metal embrittlement (LME). LME is an intergranular decohesion phenomenon leading to a drastic loss of ductility of up to 95%. The occurrence of LME for a given galvanized material mainly depends on thermal and mechanical loading. These influences are investigated for a dual phase steel with an ultimate tensile strength of 1200 MPa, a fracture strain of 14% and high ductility (DP1200HD) by means of systematic isothermal hot tensile testing on a Gleeble® 3800 thermomechanical simulator. Based on the experimental findings, a machine learning procedure using symbolic regression is applied to calibrate an LME damage model that accounts for the governing quantities of temperature, plastic strain and strain rate. The finite element (FE) implementation of the damage model is validated based on the local damage distribution in the hot tensile tested samples and in an exemplary 2-sheet resistance spot weld. The developed LME damage model predicts the local position and the local intensity of liquid metal induced cracking in both cases very well.

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Influence of the starting microstructure of an advanced high strength steel on the characteristics of Zn-Assisted liquid metal embrittlement

Cited by 41 publications

References 36 publications

Environmental degradation of structural materials in liquid lead- and lead-bismuth eutectic-cooled reactors

Environmental degradation of structural materials in liquid lead- and lead-bismuth eutectic-cooled reactors

Interstitial Segregation has the Potential to Mitigate Liquid Metal Embrittlement in Iron

Liquid Metal Embrittlement of Advanced High Strength Steel: Experiments and Damage Modeling

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