OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 5 No. 4 2023 Ta b l e 3 Chemical Composition of D2 steel Element Content (%) Element Content (%) C 1.40–1.60 Mo 0.70–1.20 Mn 0.60 V 1.10 Si 0.60 Ni 0.30 Co 1.00 P 0.03 Cr 11.0–13.0 Cu 0.25 S 0.03 Al Balance Results and Discussion The base material’s tensile strength was measured and used as a reference for comparison. Fig. 4, a shows a specimen of the base material that was tested and fig. 4, b represents the fractured specimen of the base material after the tensile test. Table 4 contains the results of the tensile test on the base material. Fractured specimens of the welded joints are shown in fig. 5 and fig. 7 and stress-strain diagrams obtained after tensile test of the welded joints, which were fabricated using cylindrical pin profile and taper cylindrical pin profile, are shown in fig. 6 and fig. 8, respectively. Fig. 5. Fractured specimens after tensile test of joints fabricated using threaded cylindrical pin a b Fig. 4. Tensile test specimens: a – before tensile test; b – after tensile test Ta b l e 4 Tensile test results of base material Load at peak, kN Tensile strength, MPa Elongation at break, mm 15.060 167 21.01
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