PSI - Issue 42

Pavel Doubek et al. / Procedia Structural Integrity 42 (2022) 1529–1536 Pavel Doubek et al./ Structural Integrity Procedia 00 (2019) 000 – 000

1533

5

(b)

(a)

Fig. 5. Microhardness test HV0.5: (a) indenter of automatic Vickers universal laboratory hardness tester DuraScan 50/70/80 G5 and (b) hardness measurement paths via bi-material interface Tensile strength near the interface was determined according to ČSN EN ISO 18265 (420379) Metal materials – Hardness conversion which specifies the principles of hardness conversion on equivalent values of other scales of hardness and estimations of tensile strength. Each staring point was selected near the edge of studied layer. The arithmetic means of the measurement values of microhardness Set 1 and Set 2 were used. For more details about the dependence of the tensile strength and Vickers microhardness, see e.g. Malau et al. (2016). 4. Results and discussion In Tabs. 4 -5, there is a summary of the fundamental measured values and results of the calculations for S960 with Metco 51NS and S960 and Rockit 401. Table 4. Measured values of the Vickers hardness, results of Young‘s modulus and tensile strength for bi-material interface S960 and aluminium bronze Metco 51NS, Vickers HV0.5 method, Lens 50×, RT Parameter Unit Value Distance to start point mm 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 Diagonal 1, set 1, d 1 S1 μm – 73.199 71.957 69.831 75.857 71.963 69.476 68.591 68.235 65.755 Diagonal 2, set 1, d 2 S1 μm – 72.844 68.767 71.248 72.844 71.963 70.362 67.527 67.173 64.692 Avg. diagonal, set 1, d S1 μm – 73.022 70.362 70.539 74.351 71.963 69.919 68.059 67.704 65.223 Diagonal 1, set 2, d 1 S2 μm 71.426 70.717 71.780 70.539 72.667 72.135 71.071 65.755 64.692 65.577 Diagonal 2, set 2, d 2 S2 μm 68.235 70.366 70.718 69.654 69.300 72.135 68.239 64.695 65.223 64.692 Avg. diagonal, set 2, d S2 μm 69.831 70.541 71.249 70.097 70.983 72.135 69.655 65.225 64.958 65.134 Hardness HV0.5, set 1 – – 174 187 186 168 179 190 200 202 218 Hardness HV0.5, set 2 – 190 186 183 189 184 178 191 218 220 219 HV0.5, arithmetic mean – 190 180 185 187.5 176 178.5 190.5 209 211 218.5 Young’s modulus, E s GPa 196.1 196.7 197.1 197.4 197.8 198.1 198.4 198.8 199.1 199.4 Tensile strength N/mm 2 610 575 595 602 563 570 612 672 678 701

Value

Parameter

Unit mm

Distance to start point Diagonal 1, set 1, d 1 S1 Diagonal 2, set 1, d 2 S1 Avg. diagonal, set 1, d S1 Diagonal 1, set 2, d 1 S2 Diagonal 2, set 2, d 2 S2 Avg. diagonal, set 2, d S2 Hardness HV0.5, set 1 Hardness HV0.5, set 2 HV0.5, arithmetic mean Young’s modulus, E s

2.2

2.4

2.6

2.8

3.0

3.2

3.4

3.6

3.8

4.0

μm μm μm μm μm μm

64.336 52.639 52.640 54.057 52.285 62.032 52.297 52.309 52.996 52.289 63.184 52.465 52.474 53.526 52.287 51.221 52.107 51.930 55.475 54.059 52.295 51.578 51.931 55.477 54.058 51.758 51.843 51.930 55.476 54.059

56.183 56.186 56.185 51.930 51.930 51.930

52.819 51.930 52.285 51.931 52.552 51.931 51.575 51.931 51.941 51.937 51.758 51.934

51.930 51.933 51.931 51.222 51.935 51.578

51.575 51.583 51.579 51.576 51.930 51.753

– – –

232 346 289

337 345 341

337 344

324 301

339 317 328

294 344 319

336 346 341

344 344 344

344 349

349 346

340.5 200.3 1098

312.5 200.7 1004

346.5 202.2 1116

347.5 202.5 1119

GPa

199.7

200.1 1098

201.0 1054

201.3 1027

201.6 1098

201.9 1107

Tensile strength

N/mm 2

927