Publications

Results 6351–6375 of 99,299

Search results

Jump to search filters

Elucidating the temperature dependence of TRIP in Q&P steels using synchrotron X-Ray diffraction, constituent phase properties, and strain-based kinetics models

Acta Materialia

Finfrock, Christopher B.; Ellyson, Benjamin; Likith, Sri R.J.; Smith, Douglas; Rietema, Connor; Saville, Alec I.; Thrun, Melissa M.; Becker, C.G.; Araujo, Ana L.; Pavlina, Erik J.; Hu, Jun; Park, Jun-Sang; Clarke, Amy J.; Clarke, Kester D.

Understanding the deformation-induced martensitic transformation (DIMT) is critical for interpreting the structure-property relationships that govern the performance of transformation-induced plasticity (TRIP) assisted steels. However, modern TRIP-assisted steels often exhibit DIMT kinetics that are not easily captured by existing empirical models based on bulk tensile strain. We address this challenge by combined bulk uniaxial tensile tests and in-situ high energy synchrotron X-ray diffraction, which resolved the phase volume fractions, stress-strain response, and microstructure evolution of each constituent phase. A modification of the Olson-Cohen model is implemented, which describes the martensitic transformation kinetics as a function of the estimated partitioned strain in austenite, rather than the bulk tensile strain. This DIMT kinetic model is used as a framework to clarify the root cause of an insufficiently understood toughness trough reported for TRIP-assisted steels during deformation at elevated temperatures. Here, the importance of the temperature-dependent toughness is discussed, based on the opportunity to modify deformation processes to tailor the DIMT kinetics and mechanical properties during forming and in service.

More Details
TYPE Journal Article YEAR 2022
DOIOSTI

Onboarding in a Virtual Environment

Khan, Rabia; Miller, Michelle; Valerio, Analise; Willhite, Isabella; Hernandez, Zachary

A need for a standardized Division 10000 onboarding program for virtual hires was identified by management to formalize the way employees and interns are onboarded and trained into Division 10000. This white paper provides effective short and long-term suggestions in the efforts of improving virtual onboarding. Data suggests that remote work is going to become the forefront of many industry practices, which indicates the need of a standardized virtual onboarding practices. With our research, gap assessments, benchmarking, and conducting interviews both internally and externally, we found that clarity, culture, and connection proved to be the strongest solutions in order to maintain Sandia’s competitive edge and sustain workers both remote and in-person.

More Details
TYPE Other Report YEAR 2022
DOIOSTI
Results 6351–6375 of 99,299
Results 6351–6375 of 99,299