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Abstract

The current trends of production of casts are directed towards production of components disposing of higher accuracy, increased quality of surface and homogenous structure. In case of a thin-walled cast the development of speed of pressing and of pressure was observed inside the mould cavity during pressure die casting of ferrous alloys. In case of die casting of ferrous alloys the attention was paid to life service of a pressing piston and of a filling chamber. The optimal temperature of the steel casting ranges from 1600 to 1750°C and optimal mould temperature ranged from 220 to 260°C. The residues having occurred in gates reached the hardness of 38 HRC and in case of casts the value was of 45 HRC. Influence of acting of resistance pressure on the thin-walled casts only minimally. With the increasing resistance pressure the structure becomes more fine-grained and along with the increasing thickness of the wall the influence of the resistance pressure increases as well. Technology of pressure die casting of iron alloys can be compared with the pressure die casting technology of aluminium alloys. As standard, for pressure die casting the cast irons with carbon content of lower than 3% are recommended.

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.A., Lenivtseva, O. G., Riapolova I.I., Emurlaev, K.I., 2016. The Structure and Properties of Cast Iron Alloyed with Copper , Materials Science and Engineering, 124, 012136. Roučka, J., Abramová, E., Kaňa, V., 2018. Properties of type SiMo ductile irons at high temperatures , Archives of Metallurgy and Materials, 2, 601-607. Siľman, G.I., Kamynin, V.V., Tarasov, A.A., 2003. Effect of Copper on Structure Formation in Cast Iron , Metal Science and Heat Treatment, 45, 7-8. Skočovský, P., Vaško, A., 2007. Quantitative Evaluation of Structure of Cast Irons , EDIS, Žilina. (in

Abstract

Nodular cast irons are used in a wide range of industrial applications, especially in the automotive industry. SiMo-type of nodular cast iron is suitable for high-temperature applications, for example the exhaust manifolds of the combustion engines; SiCu-type of nodular cast iron is used in various components of tribotechnical units. These automotive components often work in a corrosive environment. Therefore, the aim of this paper is to compare the corrosion resistance of two types of the nodular cast irons (SiMo-type and SiCu-type). Corrosion resistance was determined by the exposure immersion test at ambient temperature. Specimens of both types of nodular cast iron were immersed in 3.5 % NaCl solution (to simulate sea water) and gradually removed from the solution after 1, 2, 4 and 8 weeks. Subsequently, the weight loss (g) and the average corrosion rate (g m−2 day−1) were calculated. Experimental results show that nodular cast iron alloyed by Si and Mo has higher corrosion resistance than the nodular cast iron alloyed with Si and Cu. Moreover, the mechanical properties (evaluated by tensile test, impact bending test and hardness test) and fatigue properties of both types of nodular cast iron has been compared in the paper.

Investigation into Fatigue Behaviour of Metal-Composite Glue Connection

The paper presents the results of experimental investigations into fatigue properties of metal and CFRP-composite glued joints. The object of investigation was adhesive joints between metal sheets made from iron alloy 30HGS (popular steel in the Polish aviation industry) and CFRP orthogonal reinforced sheets made from 10 layers of SIGRATEX CE3208 pre-preg. The main adhesive was the WK-3 glue (applied in the form of 0.2 mm thin foil) while the DP-490 - liquid epoxy glue was used as technological aid for specimen manufacturing. Two kinds of specimens were prepared and tested: single-lap joints and double-lap joints. The paper presents S-N curves for both kinds of those specimens. Besides fatigue life of the glued joints, the interest was focused on the NDT tests regarding damage propagation inside the glue-connection. The paper presents several C-scans made at different stages of fatigue testing. It has been found that the damage occurs almost equally in the whole volume of the glue layer (contrary to the expectation following from the physical model of the glue-connection internal loading). The results of experiments regarding thermal effect of cyclic loading of the glued joints are also described. It has been found that this effect could be used as an important parameter for diagnostics purposes of the glued joints.

- Research of corrosion effect of the technological liquids on iron alloys.

the output stereometry and absorbent coating on the efficiency of ablative laser texturing of iron alloy 100CrMnSi6-4 , Materials Testing, Vol. 57, pp. 920-924, 2015. [7] Napadłek, W., Analysis of Selected Properties 100CrMnSi6-4 Surface Layer After Laser Micro Smelting , Archivs Metall Materials, Vol. 62, pp. 757-762, 2017. [8] Napadłek, W., Chrzanowski, W., Leoniuk, P., Fatique contact durability of laser textured rolling bearings , Inżynieria Materiałowa, Vol. 220, pp. 272-277, 2017 [9] Napadłek, W., Pakowski, C., Woźniak, A., Steel wear resistance 100CrMnSi6

Alloys and Compounds 509 (2011), 997-1000. [9] dos SANTOS, C. T. et al : Journal of Magnetism and Magnetic Materials 320 (2008), 183-185. [10] SHIETAL, M. : Journal of Magnetism and Magnetic Materials 378 (2015), 417-423. [11] ILLEKOVÁ, E. et al : Journal of Alloys and Compounds 509 (2011), 46-51. [12] OKAMOTO, H. : Phase Diagrams of Binary Iron Alloys (1993), 93-101.