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1 0 A D V A N C E D M A T E R I A L S & P R O C E S S E S | O C T O B E R 2 0 1 8 urements of residual stress within the formed part, making it possible to observe the intrinsic properties of the hydroformed parts and examine their emergence across various cross sec- tions and lattices in great detail. This fundamental knowledge of the steel’s characteristics also laid the ground- work to probe the impact of residual stress in hydroformed steel parts on vehicle durability. Researchers combined neutron data on residual stress distribution with computer simulations to see if they could improve the models that engineers use for designing and man- ufacturing auto parts. USS researchers believe their simulations and tests will help engineers understand the fatigue performance of auto parts and how different manufacturing processes may affect it. Residual stress data from the experiment may also set a new prece- dent of accuracy and specialization for validations and selections of material models in residual stress prediction or modeling. ornl.gov. NEW METHOD DETERMINES METAL INTEGRITY University of Waterloo, Canada, researchers report they have discov- ered a better way to characterize atomic structures, a critical step for improving materials selection in the aviation and automotive industries. The scientists collaborated with the Fritz Haber Insti- tute (FHI) in Berlin to develop a power- ful AI model that can accurately detect different atomic structures in metallic TESTING | CHARACTERIZATION ANALYZING ADVANCED HIGH-STRENGTH STEELS WITH NEUTRONS Scientists at United States Steel Corp. (USS) recently used neutrons at Oak Ridge National Laboratory’s Spal- BRIEFS The Buehler Wilson Reference Block Laboratory, Binghamton, N.Y., achieved accreditation to ISO/IEC 17025 by A2LA (American Association for Laboratory Ac- creditation) for Rockwell, Knoop, Vickers, and Brinell hardness test blocks and indenters. A2LA is in full conformance with ISO and IEC standards including ISO/IEC 17025. buehler.com . lationNeutronSource (SNS) to study the properties of hydroformed advanced high-strength steel (AHSS) and how it reacts to residual stress introduced during manufacturing. “Because this is a newmaterial containing retained aus- tenite, we need to have a better under- standing of its performance,” explains Lu Huang of USS. Huang says the Vulcan instrument at SNSwas the best tool for this research due to its ability to spatially resolve the residual stress in components. Vulcan’s sample environment can also accom- modate large automotive components under observation in realistic operating conditions. The team looked to the neu- tron diffraction line-scanning technique to study as-formed parts, especially those formed with AHSS. Neutron dif- fraction provides nondestructive meas- Laboratory Testing Inc., Hatfield, Pa., purchased TAC Technical Instrument Corp. (Tactic), Trenton, N.J. Tactic sells immersion ultrasonic inspection systems and accessories, providing parts, repairs, and training, and performs independent ultrasonic testing services. The majority of the company’s standard products are designed to inspect cylindrical materi- als, such as tube, pipe, bar, and billet. labtesting.com . Lu Huang prepares a lightweighted AHSS component for neutron research at the Spallation Neutron Source’s Vulvan instrument. Courtesy of ORNL/ Genevieve Martin.