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Structural stability of thin-walled austempered ductile iron castings

Górny Marcin, Gondek Łukasz, Angella Giuliano, Tyrała Edward, Kawalec Magdalena, Bitka Adam

Archives of Civil and Mechanical Engineering

2023

Vol. 23, no. 2

art. no. e79, 2023

The structural stability of ausferrite in thin-walled Austempered Ductile Iron (ADI) castings with 5 mm wall thickness is compared to a reference casting with 25 mm wall thickness. The thin-walled and reference castings were first austenitized between 850 and 925 °C, and then austempered between 250 and 380 °C. X-ray diffraction (XRD) investigations with changing temperature were performed between - 260 up to + 450 °C to investigate the change of phase fraction, lattice parameters and strain in ausferrite. The role of the austenitization temperature on structural stability and homogeneity of the investigated ADI castings has been provided. In addition, the problem of the occurrence of “blocky” high-carbon austenite that was not completely involved during austempering, has been taken into account. Finally, it has been shown that the thin-walled castings provided higher structural homogeneity and stability if compared to the reference castings.

Evaluation of the Structural Homogeneity of Denim Fabric by Means of Digital Image Analysis

Owczarek M., Masajtis J.

Fibres & Textiles in Eastern Europe

2006

Vol. 14, no. 2 (56)

41--45

A new, fast, precise and method of evaluating the homogeneity of a fabric’s structure which is not destructive has been devised. In this article, the new method was tested on denim fabrics. The basis for evaluating the homogeneity of a fabric’s structure is the homogeneity of the weft coat on the left side of the fabric, and the diameter homogeneity of the weft and warp yarn. Our investigation covered five fabrics with structural disturbances and one model fabric.

Opracowano nową, szybką, dokładną i nieniszczącą metodę oceny jednorodności struktury tkaniny. Nową metodę zweryfikowano na tkaninach typu Jeans. Podstawą oceny jednorodności struktury tkaniny typu Jeans była jednorodność pokrycia wątkowego lewej strony tkaniny, jak również jednorodność średnicy przędzy wątkowej i osnowowej. Zakres badania obejmował pięć tkanin z zaburzeniami struktury oraz jednej wzorcowej.