Mechanical Properties and Microstructures of Narrow Gap Orbital Welded P91 Steel

Abstract:

This article deals with the results of mechanical testing and structural analysis of sections of narrow gap orbital welded P91 steel on tube OD 355.6 x 40 mm. The evaluation of mechanical properties was based on tensile test at room temperature on mini-tensile specimens and on measurement of modulus of elasticity. Weld was cut longitudinally into 9 narrow slices by using waterjet. From these slices 108 flat mini-tensile specimens (dimensions of gauge is 2 x 2 mm) were prepared. In experimental part microstructure evaluation and documentation of fracture surface of each mini-tensile specimen were carried out. The aim of these experiments was to assess the mechanical properties of the individual sections of the weld (base metal, heat affected zone and weld metal). These data can be used for new approaches of FEM modelling of welds considering heat affected zone like a combination of different materials with different mechanical properties, which connect the thermally unaffected base metal and weld metal.

• Periodical: Solid State Phenomena (Volume 258)
• Pages: 635-638
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.258.635
• Online since: December 2016
• Authors: Michal Junek, Marie Svobodová, Jiří Janovec, Jakub Horváth
• Keywords: Local Mechanical Properties, Mini-Tensile Specimens, Orbital Weld, P91 Steel

References

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