Microstructural heterogeneity of forged rolled rings

• Autorzy: Herian J.
• Języki publikacji: EN

Abstrakty

EN

Purpose: The paper presents the processes which condition the quality of steel cast strands and properties of rolled products. It touches upon the technology of small-size rings manufacture from the 42CrMo4 steel used for the production of rolling bearings and toothed rings. Design/methodology/approach: Investigations were made on the 42CrMo4 steel based process of small-size rings manufacture of weight not exceeding 100 kg and the internal diameter up to 600 mm. Findings: Microstructure heterogeneity has been proven on the cross section of rods and rings under hot rolling and thermal treatment. Non-uniformity in hardness distribution was found on the hot rolled rings' face surface and cross section. Final products made from rings with heterogeneous properties characterize: difficulties with machining, cracking during surface hardening and decrease of life time. After the process modification, the rings' microstructure homogeneity and advantageous hardness distribution were obtained. Practical implications: A good quality of final rings after heat treatment is obtained in the case of charge characterized by a uniform pearlitic/ferritic microstructure. After the process technology modification, the rings' microstructure homogeneity and advantageous hardness distribution were obtained. Originality/value: The minimum processing degree in the rolling of rod products should guarantee obtaining a homogeneous microstructure on the rings cross section and properties which would ensure a good quality and the required functional properties of the final products.

Słowa kluczowe

EN

mechanical properties; plastic forming; heat treatment; microstructure

PL

właściwości mechaniczne; obróbka plastyczna; obróbka plastyczna na gorąco; mikrostruktura

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2007
• Tom: Vol. 21, nr 2
• Strony: 41--44
• Opis fizyczny: Bibliogr. 9 poz., fot., rys.

Twórcy

autor

Herian J.

• Department of Process Modelling and Medical Engineering, Silesian University of Technology, ul. Krasińskiego 8, 40-019 Katowice, Poland,

Bibliografia

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• [3] H. Filigranek, H. Szwej, Report Huta Baildon 3, 1999, 36-53 (in polish).
• [4] J. Sińczak, L. Cybula, J. Florys, Metallurgist 6 (1998) 200-208. (in polish).
• [5] J. Sińczak, W. Madej, Rolling Conference 1999, 161-166 (in polish).
• [6] J. Herian, R. Sułkowski, K. Aniołek, Rolling conference 2005, Ustroń 2005, 115-120 (in polish).
• [7] A. Hernas, J. Herian, Report of P/X-l/05 „PROMA” Katowice 2005 (in polish).
• [8] S. Casotto, F. Pascon, A. Habraken, S. Burschi, Thermo-metallurgical model to predict geometrical distortions of rings cooling phase after ring rolling operations, Journal of Machine Tools & Manufacture 45 (2005) 657.
• [9] J. Szabo, E. Dittrich, Manufacturing systems for the production of seamless-rolled rings. Journal of Materials Processing Technology 60 (1996) 67.