Tensile Behavior of T91 Steel Over a Wide Range of Temperatures and Strain-Rate Up To 104 s−1

• Published in: Journal of materials engineering and performance Vol. 23; no. 8; pp. 3007 - 3017
• Main Authors: Scapin, M., Peroni, L., Fichera, C., Cambriani, A.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.08.2014; Springer
• Subjects: Applied sciences; Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Elasticity. Plasticity; Engineering Design; Exact sciences and technology; Joining, thermal cutting: metallurgical aspects; Materials Science; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Quality Control; Reliability; Safety and Risk; Tribology; Welding; nuclear applications; solid-state welding; Johnson-Cook; Hopkinson Bar; inverse method; high strain-rate; T91 steel; high temperature; Ferritic martensitic steel; Constitutive equation; Welding; Multiobjective programming; Temperature effect; High temperature; Chromium steels; Welded joint; Hopkinson bar; High speed; Reactor material; Strain rate
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1007/s11665-014-1081-x

High chromium ferritic/martensitic steel T91 (9% Cr, 1% Mo), on account of its radiation resistance, is a candidate material for nuclear reactor applications. Its joining by an impact method to create a cold joint is tested in the realm of scoping tests toward the safe operation of nuclear fuels, encapsulated in representative T91 materials. Hitherto, T91 mechanical characterization at high strain rates is relatively unknown, particularly, in relation to impact joining and also to nuclear accidents. In this study, the mechanical characterization of T91 steel was performed in tension by varying the strain-rate (10 −3 up to 10 4  s −1 ) and temperature (20-800°C) on dog-bone specimens, using standard testing machines or Hopkinson Bar apparati. As expected, the material is both temperature and strain-rate sensitive and different sets of parameters for the Johnson-Cook strength model were extracted via a numerical inverse procedure, in order to obtain the most suitable set to be used in this field of applications.