PSI - Issue 43

Pavel Doubek et al. / Procedia Structural Integrity 43 (2023) 101–106 Pavel Doubek et al./ Structural Integrity Procedia 00 (2022) 000 – 000

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Figs. 5 – 7 plot the dependences of the hardness HV 0.5 and Young’s modulus on a distance to the interface for various materials of cladded layer on a steel substrate.

Fig. 5. The course of the Vickers microhardness test of the Metco 51NS cladded layer; red line – set 1; green line – set 2. 100 200 300 400 -2,0 -1,8 -1,6 -1,4 -1,2 -1,0 -0,8 -0,6 -0,4 -0,2 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0 Hardness [HV0.5] Distance to interface [mm] to the surface ← 0 → to the substrate 100 300 500 700 -2,0 -1,8 -1,6 -1,4 -1,2 -1,0 -0,8 -0,6 -0,4 -0,2 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 2,0 Hardness [HV0.5] Distance to interface [mm] to the surface ← 0 → to the substrate 100 125 150 175 200 225 -2,0 -1,8 -1,6 -1,4 -1,2 -1,0 -0,8 -0,6 -0,4 -0,2 0,2 0,4 0,6 0,8 1,0 1,2 1,4 1,6 1,8 2,0 E s [GPa] Distance to interface [mm] to the surface ← 0 → to the substrate Fig. 6. The course of the Vickers microhardness test of the Rockit 401cladded layer; red line – set 1; green line – set 2. Fig. 7. The course of the modulus of elasticity of the measured sample; red line – Metco 51NS set 1; green line – Metco 51NS set 2; blue line – Rockit 401 set 1; violet line – Rockit 401 set 2. Based on the results plotted in the tables and figures above, the following statements can be summarized: Microhardness of the surface layer (-2.0 to -1.8 mm from the interface) of the Metco 51NS in a combination with S960 was measured in the range of 174 – 190 HV 0.5. The declared hardness of pure aluminum bronze is 158 HV 0.5. However, the actual hardness could be partially influenced by the method of applying the cladded layer and the subsequent machining of the samples. This phase is followed by a gradual moderate increase in the microhardness of the softer surface layer near the bi-material interface. The microhardness of this layer changes due to the mixing of a molten substrate material with the cladded layer material. In the immediate vicinity of the interface (approx. -0.2 mm) the course of microhardness is affected by a significant transition zone. This is followed by an area (between 0.2 - 1 mm from the interface), in which the course of the microhardness is affected by the HAZ. At a distance of 1.2 mm and further from the interface, the base material of the substrate is gradually stabilized close to nominal values. The measured surface hardness of the Rockit 401 in combination with S960 rather corresponds to the declared one, although there is also an evident influence of the used technology (the area between -1.8 to -1.5). This is followed by a gradual reduction of microhardness due to the mixing of molten materials. The microhardness is strongly affected