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Stan A David – One of the best experts on this subject based on the ideXlab platform.

  • Calculation of inclusion formation in low-AlloySteel welds
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 1996
    Co-Authors: K.c. Hsieh, S. Suresh Babu, J.m. Vitek, Stan A David
    Abstract:

    Equilibrium thermodynamic calculations were performed to predict the sequential inclusion formation in low-AlloySteel welds. In the calculations the multi-phase equilibrium between oxides and liquid Steel was considered. The oxidation sequence was found to be sensitive to small changes in the weld metal composition. The calculations are compared with experimental measurements available in the literature. Calculated aluminum and titanium concentrations in solid solution in the weld correlated well with experimental data. The calculations indicate that the present method can be used as a first approximation to describe the inclusions formation in low-AlloySteel welds. The results are discussed with reference to the acicular ferrferrite microstructure development.

  • Phase transformations and microstructure development in low Alloy Steel welds
    , 1995
    Co-Authors: S. Suresh Babu, Stan A David, J.m. Vitek
    Abstract:

    Microstructure development in low Alloy Steel welds depends on various phase transformations that are a function of weld heating and cooling. The phase changes include non-metallic oxide inclusion formation in the liquid state, weld pool solidification, and solid state transformations. In this paper the mechanism of inclusion formation during low Alloy Steel welding is considered and the model predictions are compared with published results. The effect of inclusions on the austenite to ferrite transformation kinetics is measured and the mechanisms of transformation are discussed. The austenite gain development is related to the driving force for transformation of {delta} ferrite to austenite.

J.m. Vitek – One of the best experts on this subject based on the ideXlab platform.

  • Calculation of inclusion formation in low-AlloySteel welds
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 1996
    Co-Authors: K.c. Hsieh, S. Suresh Babu, J.m. Vitek, Stan A David
    Abstract:

    Equilibrium thermodynamic calculations were performed to predict the sequential inclusion formation in low-AlloySteel welds. In the calculations the multi-phase equilibrium between oxides and liquid Steel was considered. The oxidation sequence was found to be sensitive to small changes in the weld metal composition. The calculations are compared with experimental measurements available in the literature. Calculated aluminum and titanium concentrations in solid solution in the weld correlated well with experimental data. The calculations indicate that the present method can be used as a first approximation to describe the inclusions formation in low-AlloySteel welds. The results are discussed with reference to the acicular ferrite microstructure development.

  • Phase transformations and microstructure development in low Alloy Steel welds
    , 1995
    Co-Authors: S. Suresh Babu, Stan A David, J.m. Vitek
    Abstract:

    Microstructure development in low Alloy Steel welds depends on various phase transformations that are a function of weld heating and cooling. The phase changes include non-metallic oxide inclusion formation in the liquid state, weld pool solidification, and solid state transformations. In this paper the mechanism of inclusion formation during low Alloy Steel welding is considered and the model predictions are compared with published results. The effect of inclusions on the austenite to ferrite transformation kinetics is measured and the mechanisms of transformation are discussed. The austenite gain development is related to the driving force for transformation of {delta} ferrite to austenite.

S. Suresh Babu – One of the best experts on this subject based on the ideXlab platform.

  • Calculation of inclusion formation in low-AlloySteel welds
    Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 1996
    Co-Authors: K.c. Hsieh, S. Suresh Babu, J.m. Vitek, Stan A David
    Abstract:

    Equilibrium thermodynamic calculations were performed to predict the sequential inclusion formation in low-AlloySteel welds. In the calculations the multi-phase equilibrium between oxides and liquid Steel was considered. The oxidation sequence was found to be sensitive to small changes in the weld metal composition. The calculations are compared with experimental measurements available in the literature. Calculated aluminum and titanium concentrations in solid solution in the weld correlated well with experimental data. The calculations indicate that the present method can be used as a first approximation to describe the inclusions formation in low-AlloySteel welds. The results are discussed with reference to the acicular ferrite microstructure development.

  • Coarsening of oxide inclusions in low Alloy Steel welds
    Science and Technology of Welding and Joining, 1996
    Co-Authors: S. Suresh Babu, S.a. David, Tarasankar Debroy
    Abstract:

    Abstract Oxide inclusions that form in low Alloy Steel weld metal influence the microstructure development. This work investigates the mechanisms of inclusion coarsening in low Alloy Steel melts considering fluid flow in the melt. Controlled isothermal localised melting experiments on low Alloy Steel weld metal samples showed rapid inclusion coarsening as a result of collision and coalescence. The average diameter of the inclusions increased rapidly, resulting in a decrease in the overall number density of the inclusions as a function of holding time. These results are examined to understand weld metal inclusion formation in the presence of convective fluid flow. Investigation of the feasibility of oxide formation showed no oxidation reaction in the solid state.

  • Phase transformations and microstructure development in low Alloy Steel welds
    , 1995
    Co-Authors: S. Suresh Babu, Stan A David, J.m. Vitek
    Abstract:

    Microstructure development in low Alloy Steel welds depends on various phase transformations that are a function of weld heating and cooling. The phase changes include non-metallic oxide inclusion formation in the liquid state, weld pool solidification, and solid state transformations. In this paper the mechanism of inclusion formation during low Alloy Steel welding is considered and the model predictions are compared with published results. The effect of inclusions on the austenite to ferrite transformation kinetics is measured and the mechanisms of transformation are discussed. The austenite gain development is related to the driving force for transformation of {delta} ferrite to austenite.

A Sita Rama V Raju – One of the best experts on this subject based on the ideXlab platform.

  • microstructure hardness and residual stress distribution of dissimilar metal electron beam welds maraging Steel and high strength low Alloy Steel
    Materials Science and Technology, 2010
    Co-Authors: Venkateswara V Rao, Madhusudha G Reddy, A Sita Rama V Raju
    Abstract:

    AbstractThe present investigation reports on a study that has been taken up to develop an understanding of the electron beam welding characteristics of similar and dissimilar combination of maraging Steel and high strength low Alloy Steel, which are in the hardened condition, i.e. maraging Steel, in a solution that was in treated and aged condition, whereas high strength low Alloy Steel in a quenched and tempered condition before welding. The joint characterisation studies include microstructural examination, microhardness survey across the weldment and measurement of residual stresses. Maraging Steel weld metal is under compressive stress rather than tensile stress as observed in low Alloy Steel welds because the martensite transformation occurs at a relatively low temperature. It has been observed that, in dissimilar metal welds, tensile stress is observed at the fusion boundary of low Alloy Steel and weld metal, whereas compressive stress is obtained at the location between weld and maraging Steel fusi…

Xiaolu Pang – One of the best experts on this subject based on the ideXlab platform.

  • Corrosion of low Alloy Steel and stainless Steel in supercritical CO2/H2O/H2S systems
    Corrosion Science, 2016
    Co-Authors: Xiaolu Pang
    Abstract:

    Abstract The corrosion of low Alloy Steel and stainless Steel in the dynamic supercritical CO 2 /H 2 O/H 2 S system was studied. A Cr-containing scale, mainly consisted of FeCO 3 , Cr(OH) 3 and iron sulfide (mackinawite), formed on low Alloy Steel. FeCO 3 formed via the solid state reaction and precipitation reaction, while mackinawite could only form via the solid state reaction. In the aqueous phase, low Alloy Steel suffered severe general and localized corrcorrosion, but 316 L stainless Steel suffered pitting corrcorrosion. In the supercritical CO 2 phase, localized corrcorrosion was dominant for low Alloy Steel, and 316 L stainless Steel was highly resistant to corrosion.