Issue 46

A. Deliou et alii, Frattura ed Integrità Strutturale, 46 (2018) 306-318; DOI: 10.3221/IGF-ESIS.46.28 308 6 5 15 eq Mn Cr Mo V Ni Cu C C        (1) Tensile test In order to evaluate the load strain curve and mechanical properties of X70, flat specimens according to API requirements were used .The tensile tests were carried out in 600 KN capacity, MFL UHP PRUFSYSTEME servo hydraulic testing machine, at room temperature with a low displacement rate(1mm/min). Figure 1 : Schematic of the sampling direction of the specimens. The samples were taken in the rolling direction (Fig.1). The dimensions of weld metal specimens used according to ASTM A370 and API 5L standard are presented in Fig. 2. Tab. 3 and Fig. 3 present the results of conventional and true tensile of evolution of the stresses according to the deformation in base metal X70, where E the Young module, ν the Poisson's ratio, ௒ the yield strength, ௎ ultimate strength, A% the ductility and k and n being Hollomon's parameters. Tab. 4 shows the mechanical properties of the welded metal obtained. Figure 2 : Diagram and dimensions of weld metal specimens used for tensile tests. Figure 3: Conventional and true tensile curve of X70