TABLE 1 CHEMICAL COMPOSITION OF THE TESTED STEELS, IN WT % Material grade C Si Mn P S Al Nb V Cr Mo 37C 0.15 0.38 0.89 0.029 0.0160.0160.021 0.023 - - KL7D (1) 0.17 0.24 1.31 0.020 0.0360.049 - 0.01 0.11 0.02 DX52 (2) ≤0.18 0.15-0.20 ≤1.50 ≤0.030 ≤0.035 - - 0.02-0.06 ≤0.25 - X80TM (3) 0.077 0.30 1.84 0.012 0.0020.0360.046 - - - QStE690TM_FCG 0.08 0.29 1.75 0.011 0.0020.041 0.04 0.061 0.037 0.32 StE690_LCF 0.15 0.53 0.87 0.011 0.0040.038 - - 0.63 0.22 (1) Ni = 0.08%, Ti = 0.0017%, Cu = 0.26%. (2) Cu ≤ 0.30%. (3) Ti = 0.018%, N = 0.005%. TABLE 2 CHEMICAL COMPOSITION OF THE INVESTIGATED ALUMINIUM ALLOYS, IN WT % Material grade Si Cu Fe Mn Mg Ti Cr Zr Zn Pb AlMg3 (1) 0.179 0.022 0.310 0.2770 2.950 0.040 0.0430 0.0012 0.044 0.009 AlMg5_FCG 0.31 0.01 0.32 0.45 5.20 0.020 0.1 0.01 - - AlMg5.1Mn_LCF <0.40 <0.10 <0.40 0.75 5.1 0.20 0.12 - 0.25 - AlMg4.5Mn_FCG 0.21 0.01 0.27 0.77 4.53 0.015 0.1 0.03 - - AlMg4.5Mn_LCF 0.19 0.026 0.30 0.72 4.82 0.01 0.096 - 0.085 - 7075-T6_FCG 0.15 1.59 0.35 0.005 2.70 - 0.19 - 5.70 - 7075-T6_LCF <0.4 1.2-2.0 <0.50 <0.30 2.1-2.9 <0.200.18-0.35 - 5.1-6.1 - (1) Bi = 0.0150%, Be = 0.0018%, Al = 96.1170%. TABLE 3 MECHANICAL PROPERTIES OF THE INVESTIGATED MATERIALS Material grade Yield strength Ry, N/mm2 Tensile strength Rm, N/mm2 Elongation A5 % Reduction of area Z % Source 37C 269 405 33.5 63.5 own experiments KL7D 392 535 ≥19.0 - own experiments DX52 396 543 25.0 71.0 own experiments X80TM 540 625 25.1 73.1 own experiments QStE690TM_FCG 768 854 20.0 - own experiments StE690_LCF 743 885 - 57 [9] AlMg3 127.7 217.9 27.0 - [10] AlMg5_FCG 185 288 14.5 - [10] AlMg5.1Mn_LCF 235 400 - 34.6 [12] AlMg4.5Mn_FCG 230 296 18.0 - [10] AlMg4.5Mn_LCF 226 348 17.0 22.5 [12] 7075-T6_FCG 533 594 9.2 - [11] 7075-T6_LCF 470 580 - 33.0 [12] The results were evaluated by classical methods. The exponent ant the constant of the Manson-Coffin equation were determined by the following expression: (1) , c ap f tN ε ε = where εap is the plastic strain amplitude, Nt is the cycle number until failure, εf’ and c are material constants. The calculated parameters, the material constants (c), for the different tested steel grades and aluminium alloys are listed in Table 4.
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