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  1. Article

    Open Access

    A comprehensive study on the influence of the scan pattern in two porosity levels and surface roughness on the fatigue behavior of laser powder bed fusion manufactured specimens made of steel H13

    As a develo** and immature technique, additive manufacturing (AM) shows some limitations: depending on material and process parameters so far, it usually results in parts with residual porosity, high residua...

    J. Zhang, J. Schumacher, B. Clausen in Journal of Materials Science (2023)

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  2. Article

    Evolution of the Microstructure of Laser Powder Bed Fusion Ti-6Al-4V During Post-Build Heat Treatment

    The microstructure of additively manufactured Ti-6Al-4V (Ti64) produced by a laser powder bed fusion process was studied during post-build heat treatments between 1043 K (770 °C) and just above the β transus temp...

    D. W. Brown, V. Anghel, L. Balogh, B. Clausen… in Metallurgical and Materials Transactions A (2021)

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  3. Article

    Perspectives on Quenching and Tempering 4340 Steel

    Steels are ubiquitous due to their affordability and the landscape of useful properties that can be generated for engineering applications. But to further expand the performance envelope, one must be able to u...

    A. J. Clarke, J. Klemm-Toole, K. D. Clarke… in Metallurgical and Materials Transactions A (2020)

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  4. No Access

    Article

    Reversion of Post-Shape Memory Effect Twins During Unloading of Uranium-6 wt pct Niobium

    Uranium-6 wt pct niobium (14 at pct niobium) displays the shape memory effect (SME), where deformation proceeds by twinning and twin rearrangement via boundary migration within the SME regime. In-situ neutron dif...

    A. J. Clarke, D. W. Brown, B. Clausen… in Metallurgical and Materials Transactions A (2020)

  5. No Access

    Article

    In-Situ High-Energy X-ray Diffraction During a Linear Deposition of 308 Stainless Steel via Wire Arc Additive Manufacture

    Adoption of metal additive manufacturing (AM) components in property-critical applications requires predictable performance of fabricated metal AM parts. In-situ diagnostics coupled with material models provide a...

    D. W. Brown, A. Losko, J. S. Carpenter… in Metallurgical and Materials Transactions A (2020)

  6. No Access

    Article

    Using In Situ Neutron Diffraction to Isolate Specific Features of Additively Manufactured Microstructures in 304L Stainless Steel and Identify Their Effects on Macroscopic Strength

    Additive manufacturing of metal components results in unique microstructures with, necessarily, mechanical properties that are distinct from conventionally produced components. In this work, four distinct micr...

    D. W. Brown, D. P. Adams, L. Balogh… in Metallurgical and Materials Transactions A (2019)

  7. No Access

    Article

    A Planar Biaxial Experiment Platform for In Situ High-Energy Diffraction Studies

    An experimental platform for multiscale studies of materials subjected to plane stress loads is presented. Coupling with far-field high-energy diffraction microscopy for grain-by-grain measurements of elastic ...

    G. M. Hommer, J.-S. Park, Z. D. Brunson, J. Dahal, P. Kenesei… in Experimental Mechanics (2019)

  8. No Access

    Article

    Microstructure Development of 308L Stainless Steel During Additive Manufacturing

    In situ high-energy X-ray diffraction measurements were completed during deposition of 308L stainless steel wire onto a 304L stainless steel substrate. Attempts were made to extract microstructural features such ...

    D. W. Brown, A. Losko, J. S. Carpenter… in Metallurgical and Materials Transactions A (2019)

  9. Article

    Open Access

    Deformation twinning and grain partitioning in a hexagonal close-packed magnesium alloy

    Pervasive deformation twinning in magnesium greatly affects its strength and formability. The local stress fields associated with twinning play a key role on deformation behavior and fracture but are extremely...

    M. Arul Kumar, B. Clausen, L. Capolungo, R. J. McCabe, W. Liu… in Nature Communications (2018)

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  10. No Access

    Article

    Boundary Effects in the Eigenstrain Method

    We present a comprehensive study of the effects of internal boundaries on the accuracy of residual stress values obtained from the eigenstrain method. In the experimental part of this effort, a composite speci...

    S.-Y. Lee, S. Coratella, A. Brügger, B. Clausen, D.W. Brown… in Experimental Mechanics (2018)

  11. No Access

    Article

    Loading Path and Control Mode Effects During Thermomechanical Cycling of Polycrystalline Shape Memory NiTi

    Loading path dependencies and control mode effects in polycrystalline shape memory NiTi were investigated using in situ neutron and synchrotron X-ray diffraction performed during mechanical cycling and thermal...

    D. E. Nicholson, O. Benafan, S. A. Padula II… in Shape Memory and Superelasticity (2018)

  12. No Access

    Chapter

    Evaluation of multiple-flaw failure of bearing steel 52100 of different heats in the VHCF regime and mathematical determination of single-flaw behaviour

    Caused by different factors, the interest in extended fatigue life of components is increasing. Therefore, the demand for additional knowledge about the fatigue behaviour in the VHCF regime grows. In the case ...

    Klaus Burkart, B. Clausen, H.-W. Zoch in Fatigue of Materials at Very High Numbers … (2018)

  13. No Access

    Article

    In Situ Neutron Diffraction Study of the Influence of Microstructure on the Mechanical Response of Additively Manufactured 304L Stainless Steel

    In situ neutron diffraction measurements were completed during tensile and compressive deformation of stainless steel 304L additively manufactured (AM) using a high power directed energy ...

    D. W. Brown, D. P. Adams, L. Balogh… in Metallurgical and Materials Transactions A (2017)

  14. No Access

    Article

    Residual Stress Measurements in Dissimilar Weld Metal

    This paper describes measurements of residual stress in thin slices removed from the wall of a pressurizer safety/relief nozzle, which is a cylindrical welded component found in a nuclear power pressurized wat...

    M. D. Olson, M. R. Hill, B. Clausen, M. Steinzig, T. M. Holden in Experimental Mechanics (2015)

  15. No Access

    Article

    In Situ Neutron Diffraction Measurements During Annealing of Deformed Beryllium With Differing Initial Textures

    The recovery of deformed beryllium was studied with mechanical testing and in situ neutron diffraction measurements. The initial texture of the material and the deformation rate were manipulated to produce four d...

    Donald W. Brown, B. Clausen, T. A. Sisneros… in Metallurgical and Materials Transactions A (2013)

  16. No Access

    Article

    Methodology for Combined Neutron Diffraction and Bragg Edge Imaging

    Simultaneous use of neutron diffraction and attenuation based transmission Bragg edge imaging for strain measurements is demonstrated in this paper using the pulse neutron source at Los Alamos National Laborat...

    R. Woracek, J. R. Bunn, D. Penumadu, A. Tremsin… in MRS Online Proceedings Library (2013)

  17. No Access

    Article

    Neutron Diffraction Measurement of Stress Redistribution in Parallel Seven-Wire Strands after Local Fracture

    We report results from neutron diffraction experiments where partitioning of applied tensile load between the inner and outer wires of seven-wire parallel and quasi-parallel wire strands were measured while 1-...

    F. Mei, I. C. Noyan, A. Brügger, R. Betti, B. Clausen, D. Brown… in Experimental Mechanics (2013)

  18. No Access

    Article

    Austenite Stability Effects on Tensile Behavior of Manganese-Enriched-Austenite Transformation-Induced Plasticity Steel

    Manganese enrichment of austenite during prolonged intercritical annealing was used to produce a family of transformation-induced plasticity (TRIP) steels with varying retained austenite contents. Cold-rolled ...

    P. J. Gibbs, E. De Moor, M. J. Merwin… in Metallurgical and Materials Transactions A (2011)

  19. Article

    Open Access

    Measuring Inaccessible Residual Stresses Using Multiple Methods and Superposition

    The traditional contour method maps a single component of residual stress by cutting a body carefully in two and measuring the contour of the cut surface. The cut also exposes previously inaccessible regions o...

    P. Pagliaro, M. B. Prime, J.S. Robinson, B. Clausen, H. Swenson… in Experimental Mechanics (2011)

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  20. No Access

    Article

    In-Situ Neutron Diffraction Study of the Bauschinger Effect in B2 Structured CoZr

    A combination of in-situ neutron diffraction and elastoplastic self-consistent (EPSC) modeling have been used to elucidate the role played by intergranular stresses in the Bauschinger effect in B2 structured CoZr...

    R.P. Mulay, B. Clausen, S.R. Agnew in Metallurgical and Materials Transactions A (2011)

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