The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform

I M Robertson - One of the best experts on this subject based on the ideXlab platform.

  • the effect of nanosized ti mo c precipitates on hydrogen embrittlement of tempered lath martensitic steel
    Acta Materialia, 2014
    Co-Authors: Akihide Nagao, May L Martin, Mohsen Dadfarnia, Petros Athanasios Sofronis, I M Robertson
    Abstract:

    Abstract Nanosized (Ti,Mo)C precipitates in a high-strength tempered lath martensitic steel are shown to increase resistance to hydrogen embrittlement. The hydrogen-induced failure mode transitions from failure along lath and prior austenite boundaries in the absence of the (Ti,Mo)C precipitates to a mixed failure mode of Microvoid Coalescence and lath boundary failure in their presence. In the absence of hydrogen and regardless of the presence or absence of the (Ti,Mo)C precipitates, failure occurs via ductile Microvoid Coalescence. By correlating the macroscale mechanical properties, the fractography of the resulting failure surfaces and observation of the evolved deformation structure immediately beneath the fracture surfaces, a hydrogen-enhanced and plasticity-mediated failure mechanism is proposed in which the role of the nanosized (Ti,Mo)C precipitates is to serve as effective traps for hydrogen.

Akihide Nagao - One of the best experts on this subject based on the ideXlab platform.

  • Hydrogen embrittlement in compositionally complex FeNiCoCrMn FCC solid solution alloy
    Current Opinion in Solid State & Materials Science, 2017
    Co-Authors: Kelly E. Nygren, Akihide Nagao, Kaila M. Bertsch, Shuai Wang, Ian M. Robertson
    Abstract:

    Abstract The influence of internal hydrogen on the tensile properties of an equi-molar FeNiCoCrMn alloy results in a significant reduction of ductility, which is accompanied by a change in the fracture mode from ductile Microvoid Coalescence to intergranular failure. The introduction of 146.9 mass ppm of hydrogen reduced the plastic strain to failure from 0.67 in the uncharged case to 0.34 and 0.51 in hydrogen-charged specimens. The reduction in ductility and the transition in failure mode are clear indications that this alloy exhibits the classic signs of being susceptible to hydrogen embrittlement. The results are discussed in terms of the hydrogen-enhanced plasticity mechanism and its influence on hydrogen-induced intergranular failure. Furthermore, a new additional constraint that further promotes intergranular failure is introduced for the first time.

  • the effect of nanosized ti mo c precipitates on hydrogen embrittlement of tempered lath martensitic steel
    Acta Materialia, 2014
    Co-Authors: Akihide Nagao, May L Martin, Mohsen Dadfarnia, Petros Athanasios Sofronis, I M Robertson
    Abstract:

    Abstract Nanosized (Ti,Mo)C precipitates in a high-strength tempered lath martensitic steel are shown to increase resistance to hydrogen embrittlement. The hydrogen-induced failure mode transitions from failure along lath and prior austenite boundaries in the absence of the (Ti,Mo)C precipitates to a mixed failure mode of Microvoid Coalescence and lath boundary failure in their presence. In the absence of hydrogen and regardless of the presence or absence of the (Ti,Mo)C precipitates, failure occurs via ductile Microvoid Coalescence. By correlating the macroscale mechanical properties, the fractography of the resulting failure surfaces and observation of the evolved deformation structure immediately beneath the fracture surfaces, a hydrogen-enhanced and plasticity-mediated failure mechanism is proposed in which the role of the nanosized (Ti,Mo)C precipitates is to serve as effective traps for hydrogen.

R.d.k. Misra - One of the best experts on this subject based on the ideXlab platform.

  • On significant retention of impact strength in clay–reinforced high-density polyethylene (HDPE) nanocomposites
    Polymer, 2006
    Co-Authors: MURTHY TANNIRU, Q Yuan, R.d.k. Misra
    Abstract:

    Abstract The mechanical response of clay–reinforced polyethylene nanocomposite is investigated and the behavior compared with the un-reinforced polyethylene under identical conditions of processing. The micromechanism of plastic deformation during impact loading of neat polyethylene and clay–reinforced polyethylene nanocomposite are studied with scanning electron microscopy (SEM). The impact strength of composites is linked to structural studies by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and transmission electron microscopy (TEM) and SEM observations. The addition of clay to polyethylene retains adequately high-impact strength in the investigated temperature range of −40 to +70 °C. The micromechanism of deformation is altered from a combination of craze and drawing of fibrils in neat polyethylene to Microvoid Coalescence-fibrillated process in the nanocomposite. The aspects related to micromechanism of deformation are discussed.

  • On significant retention of impact strength in clay-reinforced high-density polyethylene (HDPE) nanocomposites
    Polymer, 2006
    Co-Authors: MURTHY TANNIRU, Q Yuan, R.d.k. Misra
    Abstract:

    The mechanical response of clay-reinforced polyethylene nanocomposite is investigated and the behavior compared with the un-reinforced polyethylene under identical conditions of processing. The micromechanism of plastic deformation during impact loading of neat polyethylene and clay-reinforced polyethylene nanocomposite are studied with scanning electron microscopy (SEM). The impact strength of composites is linked to structural studies by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and transmission electron microscopy (TEM) and SEM observations. The addition of clay to polyethylene retains adequately high-impact strength in the investigated temperature range of -40 to +70 °C. The micromechanism of deformation is altered from a combination of craze and drawing of fibrils in neat polyethylene to Microvoid Coalescence-fibrillated process in the nanocomposite. The aspects related to micromechanism of deformation are discussed. © 2006 Elsevier Ltd. All rights reserved.

May L Martin - One of the best experts on this subject based on the ideXlab platform.

  • the effect of nanosized ti mo c precipitates on hydrogen embrittlement of tempered lath martensitic steel
    Acta Materialia, 2014
    Co-Authors: Akihide Nagao, May L Martin, Mohsen Dadfarnia, Petros Athanasios Sofronis, I M Robertson
    Abstract:

    Abstract Nanosized (Ti,Mo)C precipitates in a high-strength tempered lath martensitic steel are shown to increase resistance to hydrogen embrittlement. The hydrogen-induced failure mode transitions from failure along lath and prior austenite boundaries in the absence of the (Ti,Mo)C precipitates to a mixed failure mode of Microvoid Coalescence and lath boundary failure in their presence. In the absence of hydrogen and regardless of the presence or absence of the (Ti,Mo)C precipitates, failure occurs via ductile Microvoid Coalescence. By correlating the macroscale mechanical properties, the fractography of the resulting failure surfaces and observation of the evolved deformation structure immediately beneath the fracture surfaces, a hydrogen-enhanced and plasticity-mediated failure mechanism is proposed in which the role of the nanosized (Ti,Mo)C precipitates is to serve as effective traps for hydrogen.

Petros Athanasios Sofronis - One of the best experts on this subject based on the ideXlab platform.

  • the effect of nanosized ti mo c precipitates on hydrogen embrittlement of tempered lath martensitic steel
    Acta Materialia, 2014
    Co-Authors: Akihide Nagao, May L Martin, Mohsen Dadfarnia, Petros Athanasios Sofronis, I M Robertson
    Abstract:

    Abstract Nanosized (Ti,Mo)C precipitates in a high-strength tempered lath martensitic steel are shown to increase resistance to hydrogen embrittlement. The hydrogen-induced failure mode transitions from failure along lath and prior austenite boundaries in the absence of the (Ti,Mo)C precipitates to a mixed failure mode of Microvoid Coalescence and lath boundary failure in their presence. In the absence of hydrogen and regardless of the presence or absence of the (Ti,Mo)C precipitates, failure occurs via ductile Microvoid Coalescence. By correlating the macroscale mechanical properties, the fractography of the resulting failure surfaces and observation of the evolved deformation structure immediately beneath the fracture surfaces, a hydrogen-enhanced and plasticity-mediated failure mechanism is proposed in which the role of the nanosized (Ti,Mo)C precipitates is to serve as effective traps for hydrogen.