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2 2015

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Deep cryogenic treatment of H11 hot working tool steel

Suchmann P., Niznanska J.

Journal of Achievements in Materials and Manufacturing Engineering

2015

Vol. 73, nr 1

21--26

Purpose: The investigation procedure and results of exploring the impact of deep cryogenic treatment on the wear resistance and microstructure of the X37CrMoV5-1 hot work steel. Design/methodology/approach: The wear resistance and microstructure of the X37CrMoV5-1 hot work steel. The wear resistance was measured at 400°C using the pin-on-disc method with a rotary tribometer. The microstructure of the steel was examined using optical and transmission electron microscopes. Findings: The result show a significant improvement of wear resistance through DCT, especially at high sliding velocities that are typical of many industrial applications of hot working steels (e.g. closed die forging). Apart from this, some effects of DCT on the microstructure were found, which contributed to better understanding of this process. Practical implications: The article describes the influence of DCT on the microstructure and properties of X37CrMoV5-1 (H11) hot working tool steel. Wear resistance of specimens treated using DCT was analysed on pin-on-disc wear tester and compared to that of specimens treated using standard quenching and tempering. Furthermore, the specimens’ microstructures were analysed by TEM. Originality/value: Unlike conventional cold treatment, which is commonly used for elimination of retained austenite, deep cryogenic treatment (DCT) primarily improves the wear resistance of tools. This effect is supposed to result from preferential precipitation of fine η-carbides whose formation mechanism is the subject of several recent investigations performed mainly on high speed steels.

Effect of Heat Treatment Parameters on the Formation of ADI Microstructure with Additions of Ni, Cu, Mo

Mrzygłód B., Kowalski A., Olejarczyk-Wożenska I., Adrian H., Głowacki M., Opaliński A.

Archives of Metallurgy and Materials

2015

Vol. 60, iss. 3A

1941--1948

Metallographic examinations and mechanical tests were carried out on the ductile iron with additions of Ni, Cu and Mo in as-cast state and after austempering. TTT and CCT diagrams were plotted. The heat treatment was performed in six different variants. Studies included qualitative assessment of the microstructure and testing of mechanical properties such as R0,2, Rm, A, Z, HRC, KC. An analysis of the obtained results was also presented.

Przeprowadzono badania metaloznawcze żeliwa sferoidalnego z dodatkami Ni, Cu i Mo w stanie lanym i po hartowaniu izotermicznym. Opracowano wykresy CTPi i CTPc. Obróbkę cieplną wykonano w sześciu różnych wariantach. Badania metaloznawcze obejmowały ocenę jakościową mikrostruktury i pomiary właściwości mechanicznych: R0,2, Rm, A, Z, HRC, KC. Dokonano analizy uzyskanych wyników