Zn-induced liquid metal embrittlement of galvanized high-Mn steel: Strain-rate dependency

Kang, Jee-Hyun; Hong, Seongwon; Kim, Jungwoong; Kim, Sung-Joon

doi:10.1016/j.msea.2020.139996

Cited by 17 publications

(6 citation statements)

References 27 publications

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“…Besides, the SPT showed that the brass Cu-30 wt% Zn is more susceptible to the embrittlement by eGaIn at higher strain rates. This behaviour is similar to that observed on high-Mn steel in contact with liquid Zn, which is a system that presents LME but that at slow strain rates a great fraction of solid intermetallic compounds forms and impedes the LME [18]. The same mechanism could affect the couple Cu-30 wt% Zn/eGaIn with the formation of the intermetallic CuGa 2, which is stable at room temperature.…”

Section: Resultssupporting

confidence: 81%

Effect of the Small Punch Test sample geometry on the Liquid Metal Embrittlement of Cu-30 wt% Zn by the eGaIn

Ezequiel

Serre

2021

MATEC Web Conf.

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Liquid metal embrittlement (LME) is the embrittlement or the modification of the fracture behaviour of a metal or alloy when it undergoes plastic deformation while in contact with a liquid metal or liquid alloy. LME occurrence depends strongly on the properties of the metals involved and on the conditions of the mechanical stresses applied to the solid. The Small Punch Test (SPT) on flat specimens is very sensitive to identify the conditions of LME occurrence. Moreover, there are alternative SPT notched specimen geometries that have the potential to screen solid/liquid couples for sensibility to LME in different conditions. To study the apparition of the LME on an alpha brass with 30 wt% Zn in contact with the eGaIn (Ga-In eutectic), SPT at room temperature were carried out at different displacement rates and using three specimen types: the standard flat geometry and two notched geometries. While the flat specimens did not present LME, the presence of a notch and a high strain rate induced LME on the other specimen geometries. For these last specimens, the eGaIn modifies the SPT load-displacement curves at the crack propagation stage and changes the fracture to a partially ductile fracture followed by a brittle fracture.

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Section: Resultssupporting

confidence: 81%

Effect of the Small Punch Test sample geometry on the Liquid Metal Embrittlement of Cu-30 wt% Zn by the eGaIn

Ezequiel

Serre

2021

MATEC Web Conf.

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“…The lower the strain rate, the more time is available and more zinc is able to penetrate at the grain boundaries and cause a more pronounced rupture behavior, but also more intermetallic phases are formed that delay the start of LME. Above the vaporization temperature of zinc, a recovery of ductility is found for strain rates up to 1.0 s −1 [ 38 ]; see Figure 5 a. A damage model solely based on the strain energy was found to be inappropriate for non-isothermal loading.…”

Section: Resultsmentioning

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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“…For example, the FeÀ Zn system suffer from severe embrittlement as both Zn and Fe are soluble in liquid gallium. [48] Aluminum and its alloys are highly reactive towards gallium, where gallium induces fast corrosion of aluminum even at 120 °C. [49] 1Cr18Ni9 stainless steel corrodes when it is brought into contact with liquid gallium at 120 °C.…”

Section: Materials Requirement For Liquid Metal Alloys-based Reactorsmentioning

confidence: 99%

Liquid Metal Alloy Catalysis – Challenges and Prospects

Ameen,

Jabbar,

Yang

et al. 2023

ChemCatChem

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Significant progress has been made in recent years in the development of liquid metal alloy catalysts. This article provides an overview of the state‐of‐the‐art research pertaining to liquid metal alloy catalysis, including alloy synthesis, reactor design, and theoretical calculations. Different alloy synthesis methods are discussed with a focus on strategies that can achieve colloidal intermetallic structures in liquid metal alloys. Current reactors for liquid metal‐based electrocatalytic and thermochemical processes are summarized. The application of theoretical tools, such as machine learning and computational chemistry to further liquid metal alloy design, is discussed. Finally, an outlook on the technological challenges and our perspective on future research opportunities for liquid metal alloy catalysis is presented.

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Zn-induced liquid metal embrittlement of galvanized high-Mn steel: Strain-rate dependency

Cited by 17 publications

References 27 publications

Effect of the Small Punch Test sample geometry on the Liquid Metal Embrittlement of Cu-30 wt% Zn by the eGaIn

Effect of the Small Punch Test sample geometry on the Liquid Metal Embrittlement of Cu-30 wt% Zn by the eGaIn

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

Liquid Metal Alloy Catalysis – Challenges and Prospects

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