The Experts below are selected from a list of 1521 Experts worldwide ranked by ideXlab platform

Thierry Auger - One of the best experts on this subject based on the ideXlab platform.

  • Liquid Metal Embrittlement
    Mechanics - Microstructure - Corrosion Coupling, 2019
    Co-Authors: Thierry Auger, Jean Bernard Vogt, Ingrid Proriol Serre
    Abstract:

    Abstract: If the terminology “hydrogen Embrittlement” (HE) very explicitly points to the species responsible for the physical phenomenon, it is not the same for Liquid Metal Embrittlement (LME). Whilst the first case suggests focusing on the presence of H+, H or H2, the second suggests that a priori all Metals, provided that they are Liquid, could lead to ductility loss. However, in terms of the literature, the number of articles dedicated to LME is much more modest than that dedicated to HE and accordingly the phenomena and the cases of LME are certainly less well known than those of HE.

  • Multiscale investigation of crack path and microstructural changes during Liquid Metal Embrittlement of 304L austenitic steel in Liquid sodium
    Corrosion Science, 2017
    Co-Authors: Bassem Barkia, Thierry Auger, J. L. Courouau, J. Bourgon
    Abstract:

    Abstract Fracture micro-mechanisms and crack path of embrittled austenitic steel 304L by Liquid sodium strained at 4.2 × 10−7 m s−1 and 573 K are investigated underneath the fracture surface by transmission electron microscopy down to the nanoscale. Automated crystal orientation and phase mapping analyses show that abundant martensitic transformation (γ austenite → α’ martensite) as well as mechanical twinning occur during the deformation of austenite and play a major role in the fracture process. A correlation between the fracture surface features and the underlying microstructural interfaces is evidenced, strengthening the conclusion that Liquid Metal Embrittlement by sodium of austenitic steels is basically an interfacial cracking phenomenon.

  • Crack path in Liquid Metal Embrittlement: experiments with steels and modeling
    Fracture and Structural Integrity, 2015
    Co-Authors: Thierry Auger, S. Hémery, M. Bourcier, C. Berdin, M.l. Martin, Ian M. Robertson
    Abstract:

    We review the recent experimental clarification of the fracture path in Liquid Metal Embrittlement with austenitic and martensitic steels. Using state of the art characterization tools (Focused Ion Beam and Transmission Electron Microscopy) a clear understanding of crack path is emerging for these systems where a classical fractographic analysis fails to provide useful information. The main finding is that most of the cracking process takes place at grain boundaries, lath or mechanical twin boundaries while cleavage or plastic flow localization is rarely the observed fracture mode. Based on these experimental insights, we sketch an on-going modeling strategy for LME crack initiation and propagation at mesoscopic scale.

  • Liquid Metal Embrittlement susceptibility of T91 steel by Lead-Bismuth
    2015
    Co-Authors: Thierry Auger, Gérard Lorang
    Abstract:

    Previous studies on T91 steel in its standard Metallurgical state do not provide evidence for Liquid Metal Embrittlement (LME) by eutectic Pb-Bi. In this paper, we show that this steel can be embrittled by Pb-Bi when direct contact between the steel and the Liquid Metal is obtained by prior ion beam sputtering of the native oxidized film. Study of LME of steels by Pb-Bi is of renewed interest in the context of structural materials for Accelerator Driven System (ADS). These systems aim at burning nuclear waste in a sub-critical core with a powerful neutron source to maintain a stationary neutron flux. The Liquid eutectic Pb-Bi serves as cooling fluid, as well as the neutron production media b

  • Liquid Metal Embrittlement of an austenitic stainless steel in Liquid sodium
    Corrosion Science, 2014
    Co-Authors: S. Hémery, Thierry Auger, J. L. Courouau, F. Balbaud-célérier
    Abstract:

    Abstract A Fe18Cr9Ni1Mn austenitic stainless steel is shown to be sensitive to Liquid Metal Embrittlement in Liquid sodium. Good wetting by sodium is achieved during long-term pre-exposure before tensile testing in Liquid sodium with additions of Na 2 O. Pre-exposure does not affect the normal ductile fracture mode of the steel in reference tests in the temperature range investigated ([473–673 K]). Intergranular cracking is found to play a key role in the fracture process in Liquid sodium.

Rouholah Ashiri - One of the best experts on this subject based on the ideXlab platform.

  • Liquid Metal Embrittlement free welds of zn coated twinning induced plasticity steels
    Scripta Materialia, 2016
    Co-Authors: Rouholah Ashiri, M Shamanian, H R Salimijazi, Anwarul Haque, Changwook Ji, Kwanggeun Chin, Yeongdo Park
    Abstract:

    Abstract The high electrical resistivity of twinning induced plasticity steels makes their resistance spot welding difficult and limits their weldability. Meanwhile, Liquid Metal Embrittlement of Zn-coated twinning induced plasticity steel welds is one of the most important challenges facing the scientific community. Liquid Metal Embrittlement also limits weldability of the steels and influences the mechanical response of welds. This work addresses this challenge by developing an innovative pathway to obtain Liquid Metal Embrittlement-free welds which is able to extend the weldable current range of the steels. Simulations demonstrate that the method can perform a smart management of heating which is critically required to obtain Embrittlement-free welds.

  • supercritical area and critical nugget diameter for Liquid Metal Embrittlement of zn coated twining induced plasticity steels
    Scripta Materialia, 2015
    Co-Authors: Rouholah Ashiri, M Shamanian, H R Salimijazi, Anwarul Haque, Changwook Ji, Yeongdo Park
    Abstract:

    Abstract Liquid Metal Embrittlement induced cracking of zinc-coated twining induced plasticity steels was investigated during their resistance spot welding. Crack resistance of steel was investigated in relation to Liquid Metal Embrittlement phenomenon. It was found that there are supercritical area and critical nugget diameter for cracking the welds. This suggests that crack-free welds are obtained only if the maximum nugget diameter being formed at expulsion current maintains below the critical nugget diameter of Liquid Metal Embrittlement. Moreover, different Zn-coated (galvanized, galvannealed and electrogalvanized) twining induced plasticity steels are embrittled by Liquid zinc but their cracking resistances are depended on chemical composition and process conditions of coating materials.

Yeongdo Park - One of the best experts on this subject based on the ideXlab platform.

  • Liquid Metal Embrittlement free welds of zn coated twinning induced plasticity steels
    Scripta Materialia, 2016
    Co-Authors: Rouholah Ashiri, M Shamanian, H R Salimijazi, Anwarul Haque, Changwook Ji, Kwanggeun Chin, Yeongdo Park
    Abstract:

    Abstract The high electrical resistivity of twinning induced plasticity steels makes their resistance spot welding difficult and limits their weldability. Meanwhile, Liquid Metal Embrittlement of Zn-coated twinning induced plasticity steel welds is one of the most important challenges facing the scientific community. Liquid Metal Embrittlement also limits weldability of the steels and influences the mechanical response of welds. This work addresses this challenge by developing an innovative pathway to obtain Liquid Metal Embrittlement-free welds which is able to extend the weldable current range of the steels. Simulations demonstrate that the method can perform a smart management of heating which is critically required to obtain Embrittlement-free welds.

  • supercritical area and critical nugget diameter for Liquid Metal Embrittlement of zn coated twining induced plasticity steels
    Scripta Materialia, 2015
    Co-Authors: Rouholah Ashiri, M Shamanian, H R Salimijazi, Anwarul Haque, Changwook Ji, Yeongdo Park
    Abstract:

    Abstract Liquid Metal Embrittlement induced cracking of zinc-coated twining induced plasticity steels was investigated during their resistance spot welding. Crack resistance of steel was investigated in relation to Liquid Metal Embrittlement phenomenon. It was found that there are supercritical area and critical nugget diameter for cracking the welds. This suggests that crack-free welds are obtained only if the maximum nugget diameter being formed at expulsion current maintains below the critical nugget diameter of Liquid Metal Embrittlement. Moreover, different Zn-coated (galvanized, galvannealed and electrogalvanized) twining induced plasticity steels are embrittled by Liquid zinc but their cracking resistances are depended on chemical composition and process conditions of coating materials.

Gérard Lorang - One of the best experts on this subject based on the ideXlab platform.

  • Liquid Metal Embrittlement susceptibility of T91 steel by Lead-Bismuth
    2015
    Co-Authors: Thierry Auger, Gérard Lorang
    Abstract:

    Previous studies on T91 steel in its standard Metallurgical state do not provide evidence for Liquid Metal Embrittlement (LME) by eutectic Pb-Bi. In this paper, we show that this steel can be embrittled by Pb-Bi when direct contact between the steel and the Liquid Metal is obtained by prior ion beam sputtering of the native oxidized film. Study of LME of steels by Pb-Bi is of renewed interest in the context of structural materials for Accelerator Driven System (ADS). These systems aim at burning nuclear waste in a sub-critical core with a powerful neutron source to maintain a stationary neutron flux. The Liquid eutectic Pb-Bi serves as cooling fluid, as well as the neutron production media b

  • Liquid Metal Embrittlement susceptibility of t91 steel by lead bismuth
    Scripta Materialia, 2005
    Co-Authors: Thierry Auger, Gérard Lorang
    Abstract:

    Abstract Previous studies on T91 steel in its standard Metallurgical state do not provide evidence for Liquid Metal Embrittlement by eutectic Pb–Bi. In this paper, we show that this steel can be embrittled by Pb–Bi when direct contact between the steel and the Liquid Metal is obtained by prior ion beam sputtering of the native oxidized film.

  • Liquid Metal Embrittlement susceptibility of T91 steel by lead¿bismuth
    Scripta Materialia, 2005
    Co-Authors: Thierry Auger, Gérard Lorang
    Abstract:

    Abstract Previous studies on T91 steel in its standard Metallurgical state do not provide evidence for Liquid Metal Embrittlement by eutectic Pb–Bi. In this paper, we show that this steel can be embrittled by Pb–Bi when direct contact between the steel and the Liquid Metal is obtained by prior ion beam sputtering of the native oxidized film.

  • Liquid Metal Embrittlement susceptibility of T91 steel by Lead-Bismuth
    2004
    Co-Authors: Thierry Auger, Gérard Lorang
    Abstract:

    Previous studies on T91 steel in its standard Metallurgical state found no evidence for Liquid Metal Embrittlement (LME) by eutectic Pb-Bi. In this paper, we report clear evidence that this steel can be embrittled by Pb-Bi when direct contact between the steel and the Liquid Metal is obtained by prior ion beam sputtering.

Chaohong Liu - One of the best experts on this subject based on the ideXlab platform.

  • Liquid Metal Embrittlement of an Fe10Cr4Al ferritic alloy exposed to oxygen-depleted and -saturated lead-bismuth eutectic at 350°C
    Corrosion Science, 2020
    Co-Authors: Xing Gong, Jiajun Chen, Congying Xiang, Jun Xiao, Hui Wang, Haoran Gong, Hao Wang, Chaohong Liu
    Abstract:

    Abstract Liquid Metal Embrittlement (LME) of an Fe10Cr4Al (wt%) ferritic alloy was tested in lead-bismuth eutectic (LBE) at 350 °C using slow strain rate tensile tests. The results show that this alloy is highly susceptible to LME. The strong LME effect is manifested by a substantial reduction in ductility and completely cleaved fracture surfaces. Transgranular cleavage and intergranular cracking are the major fracture modes. The LME susceptibility is slightly weaker in oxygen-saturated LBE than oxygen-depleted LBE due to the presence of a double-layer scale consisting of magnetite and Al-rich spinel. The oxide scale is fragmented, indicative of a brittle nature.

  • Liquid Metal Embrittlement of an fe10cr4al ferritic alloy exposed to oxygen depleted and saturated lead bismuth eutectic at 350 c
    Corrosion Science, 2020
    Co-Authors: Xing Gong, Jiajun Chen, Congying Xiang, Jun Xiao, Hui Wang, Haoran Gong, Hao Wang, Chaohong Liu, Yangbin Deng, Bo Pang
    Abstract:

    Abstract Liquid Metal Embrittlement (LME) of an Fe10Cr4Al (wt%) ferritic alloy was tested in lead-bismuth eutectic (LBE) at 350 °C using slow strain rate tensile tests. The results show that this alloy is highly susceptible to LME. The strong LME effect is manifested by a substantial reduction in ductility and completely cleaved fracture surfaces. Transgranular cleavage and intergranular cracking are the major fracture modes. The LME susceptibility is slightly weaker in oxygen-saturated LBE than oxygen-depleted LBE due to the presence of a double-layer scale consisting of magnetite and Al-rich spinel. The oxide scale is fragmented, indicative of a brittle nature.