Partner: Z. Pakieła

Warsaw University of Technology (PL)

Recent publications
1.Nosewicz S., Romelczyk-Baishya B., Lumelskyj D., Chmielewski M., Bazarnik P., Jarząbek D., Pietrzak K., Kaszyca K., Pakieła Z., Experimental and numerical studies of micro- and macromechanical properties of modified copper–silicon carbide composites, INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, ISSN: 0020-7683, DOI: 10.1016/j.ijsolstr.2018.10.025, Vol.160, pp.187-200, 2019
Abstract:

The presented research investigation comprises the study of the mechanical properties of modified copper–silicon carbide composites at the micro- and macroscopic scale. The improvement of a copper–silicon carbide composite refers to the addition of a protective layer at the ceramic reinforcement in order to prevent the dissolution of silicon in the copper matrix. The macromechanical behaviour has been evaluated by the performance in a small punch test. The investigation has been carried out with samples with varying volume content of ceramic reinforcement and different protective layers of the silicon carbide particles. Moreover, the influence of temperature during the strength test has been studied. Next, the results have been referred to the interfacial bonding strength of Cu and SiC particles. SEM characterization of samples has been performed to link the composites’ microstructure with the mechanical behaviour. Finally, the experimental results of the small punch test have been predicted via a numerical approach. Finite element analysis has been employed to reproduce the response of the composite specimen during the test. Satisfactory agreement with the experimental curve has been obtained.

Keywords:

metal matrix composites; silicon carbide; metallic layers deposition; small punch; interface strength; finite element method

Affiliations:
Nosewicz S.-IPPT PAN
Romelczyk-Baishya B.-Warsaw University of Technology (PL)
Lumelskyj D.-IPPT PAN
Chmielewski M.-Institute of Electronic Materials Technology (PL)
Bazarnik P.-Warsaw University of Technology (PL)
Jarząbek D.-IPPT PAN
Pietrzak K.-other affiliation
Kaszyca K.-other affiliation
Pakieła Z.-Warsaw University of Technology (PL)
2.Romelczyk-Baishya B., Lumelskyj D., Stępniewska M., Giżyński M., Pakieła Z., The mechanical properties at room and low temperature of p110 steel characterised by means of small punch test, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, DOI: 10.24425/amm.2019.126232, Vol.64, No.1, pp.159-165, 2019
Abstract:

In this paper, small punch test (SPT) which is one of miniaturized samples technique, was employed to characterize the mechanical properties of carbon steel P110. The tests were carried out in the range of –175°C to RT. Results obtained for SPT were compared to those calculated for tensile and Charpy impact test. Based on tensile and SPT parameters numerical model was prepared. 8 mm in diameter and 0.8 mm in height (t) discs with and without notch were employed in this research. The specimens had different depth notch (a) in the range of 0.1 to 0.4 mm. It was estimated that α factor for comparison of Tsp and DBTT for carbon steel P110 is 0.55 and the linear relation is DBTT = 0.55TSPT. The numerical model fit with force – deflection curve of SPT. If the factor of notch depth and samples thickness is higher than 0.3 the fracture mode is transformed from ductile to brittle at –150°C.

Keywords:

small punch test, carbon steel P110, small samples, low temperature, mechanical properties

Affiliations:
Romelczyk-Baishya B.-Warsaw University of Technology (PL)
Lumelskyj D.-IPPT PAN
Stępniewska M.-Warsaw University of Technology (PL)
Giżyński M.-Warsaw University of Technology (PL)
Pakieła Z.-Warsaw University of Technology (PL)
3.Kukla D., Brynk T., Pakieła Z., Assessment of Fatigue Resistance of Aluminide Layers on MAR 247 Nickel Super Alloy with Full-Field Optical Strain Measurements, Journal of Materials Engineering and Performance, ISSN: 1059-9495, DOI: 10.1007/s11665-017-2767-7, pp.1-12, 2017
Abstract:

This work presents the results of fatigue tests of MAR 247 alloy flat specimens with aluminides layers of 20 or 40 µm thickness obtained in CVD process. Fatigue test was conducted at amplitude equal to half of maximum load and ranging between 300 and 650 MPa (stress asymmetry ratio R = 0, frequency f = 20 Hz). Additionally, 4 of the tests, characterized by the highest amplitude, were accompanied with non-contact strain field measurements by means of electronic speckle pattern interferometry and digital image correlation. Results of these measurements allowed to localize the areas of deformation concentration identified as the damage points of the surface layer or advanced crack presence in core material. Identification and observation of the development of deformation in localization areas allowed to assess fatigue-related phenomena in both layer and substrate materials.

Keywords:

aluminide layer, fatigue testing, full-field optical strain measurements, super nickel alloy

Affiliations:
Kukla D.-IPPT PAN
Brynk T.-Warsaw University of Technology (PL)
Pakieła Z.-Warsaw University of Technology (PL)
4.Oliferuk W., Beygelzimer Y., Maj M., Synkov S., Reshetov A., Pakieła Z., Zdolność magazynowania energii podczas rozciągania tytanu po wyciskaniu przez matrycę skrętną, Polska metalurgia w latach 2002-2006; Wydawnictwo Naukowe Akapit (Kraków), Świątkowski K. (Ed.), pp.495-500, 2006
Abstract:

The presented work is devoted to experimental studies of the energy storage process in the tensile test of the ultrafine-grained (UFG) titanium in comparison with the coarse-grained one. The UFG titanium was obtained using severe plastic deformation method (SPD) called twist extrusion (TE) that is briefly presented.
The experiments were performed on three groups of titanium specimens. Two of them (T1 and T2) were cut from the materials obtained by TE method. The T1 titanium was processed by 4 passes through the left twist die, whereas for the T2 titanium the twist direction was changed after the first pass. The last group (T0) was prepared from the annealed sheet of coarse-grained titanium. It was noticed that mechanical properties of the material underwent TE differs considerably from properties of te coarsed-grained one. It was observed that yield point obtained for specimens after TE is about 30% higher then that for coarsed-grained material. However, the elongation decrease was observed for both groups of specimens after TE (T1~60%, T2~25%) with respect to T0 ones.
The energy storage investigations show the differences in the energy storage rate for T1 and T2 specimens. In the case of T1 specimens the energy storage rate decreases rapidly with strain whereas for T2 specimens (where twist direction was changed) the energy storage rate remains constant at the homogeneous deformation range. The experimental results show that the change of the twist direction during TE may improve the mechanical properties of the material. The constant rate of energy storage in specimens after twist direction change may be macroscopic manifestation of homogeneous and more stable structure of the material.

Keywords:

energy storage rate, ultrafine-grained titanium, severe plastic deformation, twist extrusion

Affiliations:
Oliferuk W.-IPPT PAN
Beygelzimer Y.-other affiliation
Maj M.-IPPT PAN
Synkov S.-other affiliation
Reshetov A.-other affiliation
Pakieła Z.-Warsaw University of Technology (PL)