Duplex Stainless Steel

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Ben Young - One of the best experts on this subject based on the ideXlab platform.

  • Mechanical properties of lean Duplex Stainless Steel at post-fire condition
    Thin-Walled Structures, 2018
    Co-Authors: Yuner Huang, Ben Young
    Abstract:

    Abstract This paper reports an experimental investigation of the mechanical properties of cold-formed lean Duplex Stainless Steel after exposure to high temperatures up to 1000 °C. The test specimens were extracted from rectangular and square hollow sections that were cold-rolled from flat plates of lean Duplex Stainless Steel. The mechanical properties, Young's modulus, yield strength, ultimate strength, Ramberg-osgood parameter and strain at ultimate strength of lean Duplex Stainless Steel, are reported. The residual mechanical properties of Steel materials are compared with the predicted values calculated by the existing equations. It is shown that the existing equations cannot provide accurate predictions for the post-fire mechanical properties of lean Duplex Stainless Steel materials. Thus, a unified equation is proposed to predict residual mechanical properties for lean Duplex Stainless Steel specimens in post-fire conditions. A constitutive model is also proposed to predict the stress-strain relationship of the test specimens after exposure to high temperatures up to 1000 °C. A reliability analysis was conducted for the proposed equation. The proposed equation compared favourably with the experimental results, and was found to be reliable for predicting lean Duplex Stainless Steel mechanical properties after exposure to high temperatures.

  • design of cold formed lean Duplex Stainless Steel members in combined compression and bending
    Journal of Structural Engineering-asce, 2015
    Co-Authors: Yuner Huang, Ben Young
    Abstract:

    AbstractThe structural performance and design of cold-formed lean Duplex Stainless Steel members in combined compression and bending are investigated. A wide range of square and rectangular hollow sections has been performed by finite-element analysis. A finite-element model has been developed and verified against the available test data for lean Duplex Stainless Steel members subjected to axial compression and minor axis bending. An extensive parametric study was conducted using the verified finite-element model, and 150 finite-element analysis results were obtained. A total of 233 data, including the numerical results obtained in this study as well as the experimental and numerical data from the literature, are compared with design predictions from the current American, Australian/New Zealand, and European specifications for Stainless Steel structures. Reliability analysis was carried out to assess the reliability of these design rules for the lean Duplex Stainless Steel beam-column members. It is shown...

  • structural performance of cold formed lean Duplex Stainless Steel columns
    Thin-walled Structures, 2014
    Co-Authors: Yuner Huang, Ben Young
    Abstract:

    Abstract The structural performance of cold-formed lean Duplex Stainless Steel columns was investigated. A wide range of finite element analysis on square and rectangular hollow sections and other available data, with a total number of 259 specimens, were considered. An accurate finite element model has been created to simulate the pin-ended cold-formed lean Duplex Stainless Steel columns. Extensive parametric study was carried out using the validated finite element model. The column strengths predicted from the parametric study together with the available data are compared with the design strengths calculated from various existing design rules for cold-formed Stainless Steel structures. It is shown that the existing design rules, except for the ASCE Specification as well as the stub column and full area approach, are conservative. Modifications are proposed for the AS/NZS Standard, EC3 Code, and direct strength method. Reliability analysis was performed to assess the existing and modified design rules. It is also shown that the modified design rules are able to provide a more accurate and reliable predictions for lean Duplex Stainless Steel columns. In this study, it is suggested that the modified design rules in the AS/NZS Standard and the modified direct strength method to be used in designing cold-formed lean Duplex Stainless Steel columns.

  • experimental investigation of cold formed lean Duplex Stainless Steel beam columns
    Thin-walled Structures, 2014
    Co-Authors: Yuner Huang, Ben Young
    Abstract:

    Abstract This paper describes a test program on cold-formed lean Duplex Stainless Steel members in combined compression and minor axis bending. The test specimens were cold-rolled from flat strips of lean Duplex Stainless Steel grade EN 1.4162. In this study, square and rectangular hollow sections were compressed at different eccentricities, in order to obtain a beam-column interaction curve for each series of tests. Initial overall geometric imperfections of the members were measured prior to testing. The ultimate loads and the failure modes of each specimen were obtained. The observed failure modes include local buckling, flexural buckling and interaction of local and flexural buckling. The test strengths obtained from this study and other available data were compared with the design strengths predicted by the American Specification, Australian/New Zealand Standard and European Code for Stainless Steel structures. It should be noted that these specifications do not cover the material of lean Duplex Stainless Steel. Therefore, the suitability of the beam-column design rules in these specifications for lean Duplex Stainless Steel is assessed in this study. Generally, these specifications are capable of predicting the beam-column strengths of the lean Duplex Stainless Steel test specimens, and the design rules in the specifications are considered to be reliable. It is observed that the European Code generally provides quite conservative predictions for the beam-column specimens compared to the American Specification and Australian/New Zealand Standard predictions.

  • FRP strengthening of lean Duplex Stainless Steel hollow sections subjected to web crippling
    Thin-Walled Structures, 2014
    Co-Authors: S.m. Zahurul Islam, Ben Young
    Abstract:

    Abstract This paper presents the experimental and numerical investigations of lean Duplex Stainless Steel hollow sections subjected to web crippling. The test specimens were strengthened with different fibre-reinforced polymer (FRP). The web crippling tests were conducted under end-two-flange, interior-two-flange, end-one-flange and interior-one-flange loading conditions. A series of web crippling tests was conducted. The investigation was focused on the effects of surface treatment, web slenderness, different adhesives and FRPs for the strengthening of lean Duplex Stainless Steel hollow sections against web crippling. The lean Duplex Stainless Steel type EN 1.4162 was used in the investigation. Two different surface treatments, three different adhesives and six different FRPs were investigated in this study. The tests were performed on five different sizes of square and rectangular hollow sections that covered a wide range of web slenderness ratio from 8.1 to 57.3. Three different failure modes were observed in the tests of the strengthened specimens, namely the adhesion, interlaminar failure of FRP plate and combination of adhesion and interlaminar failure of FRP plate. Finite element models have been developed and verified against the test results of the specimens subjected to two-flange loading conditions.

Rolf Sandstrom - One of the best experts on this subject based on the ideXlab platform.

Dong Limin - One of the best experts on this subject based on the ideXlab platform.

  • Effect of ultrafine grain on tensile behaviour and corrosion resistance of the Duplex Stainless Steel
    Materials Science and Engineering: C, 2016
    Co-Authors: Lv Jinlong, Liang Tongxiang, Wang Chen, Dong Limin
    Abstract:

    Abstract The ultrafine grained 2205 Duplex Stainless Steel was obtained by cold rolling and annealing. The tensile properties were investigated at room temperature. Comparing with coarse grained Stainless Steel, ultrafine grained sample showed higher strength and plasticity. In addition, grain size changed deformation orientation. The strain induced α′-martensite was observed in coarse grained 2205 Duplex Stainless Steel with large strain. However, the grain refinement inhibited the transformation of α′-martensite;nevertheless, more deformation twins improved the strength and plasticity of ultrafine grained 2205 Duplex Stainless Steel. In addition, the grain refinement improved corrosion resistance of the 2205 Duplex Stainless Steel in sodium chloride solution.

Isolda Costa - One of the best experts on this subject based on the ideXlab platform.

  • On the pitting resistance of friction stir welded UNS S82441 lean Duplex Stainless Steel
    Journal of Materials Research and Technology, 2019
    Co-Authors: Antonio M. Dos S. Leite, Maysa Terada, Victor Ferrinho Pereira, Eduardo Bertoni Da Fonseca, Nelson Batista De Lima, Isolda Costa
    Abstract:

    Abstract Friction stir welding has been considered as an alternative to fusion welding processes of Stainless Steels. A lean Duplex Stainless Steel, grade UNS S82441, has been recently developed and is prone to localized corrosion, such as pitting when exposed to harsh conditions during use. However, pitting resistance of UNS S82441 has not been previously investigated. In this study, UNS S82441 lean Duplex Stainless Steel was friction stir welded, and its microstructure and localized corrosion resistance were investigated by phase volumetric fraction, scanning electron microscopy, transmission electron microscopy and electrochemical tests. The pitting resistance of each zone was investigated by polarization tests and by determining the critical pitting temperature. The results indicated that microstructural changes promoted by friction stir welding affected the pitting resistance of the lean Duplex Stainless Steel.

Henrik Sieurin - One of the best experts on this subject based on the ideXlab platform.

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