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Fatigue failure of micro-alloyed 23MnB4 steel

Rusz S., Cizek L., Filipec P., Pastrnak M.

Journal of Achievements in Materials and Manufacturing Engineering

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2008

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Vol. 31, nr 2

356-363

EN

Purpose: In the following paper there have been the structure and fatigue properties of micro-alloyed 23MnB4 steel in initial state and after heat treatment evaluated. Design/methodology/approach: Fatigue test of micro-alloyed 23MnB4 steel was completed by metallographic and fracture analyses. For scope the methods of the light microscopy and SEM were used. Findings: Microstructure of examined alloy in initial state was characterized mostly by fine ferrite with pearlitic net and in state after heat treatment was formed by martensite or partly by bainite and after tempering was formed by tempered martensite. Objective of this work consisted in determination of fatigue characteristics of micro-alloyed 23MnB4 steel, including fracture analyze. Results of fatigue testing at various stress levels for the samples in initial state and after the heat treatment have confirmed that obtained values of cycles to rupture were at least 585 000 cycles. Change of fatigue properties in dependence on heat treatment of the used steel. Research limitations/implications: For define fracture area a samples must be provide with notch. The experiment was limited by occurrence a void in cast alloys. Practical implications: The results may be utilized for application of the investigated material in process of manufacturing. Originality/value: These results contribute to explanation of fracture mechanism of micro-alloyed 23MnB4 steel.

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Evaluation of fatigue of micro-alloyed 23MnB4 steel

Rusz S., Cizek L., Filipec P.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 18, nr 1-2

223--226

EN

Purpose: Purpose of this article is to extend a complex evaluation of fatigue properties of micro-alloyed 23MnB4 steel in initial state and after heat treatment. Design/methodology/approach: Testing of micro-alloyed 23MnB4 steel was based on fatigue test completed by metallographic and fracture analyses. The methods of the light microscopy and SEM were used. Findings: Objective of this work consisted in determination of fatigue characteristics of micro-alloyed 23MnB4 steel, including fracture analyze. Results of fatigue testing at various stress levels for the samples in initial state and after the heat treatment have confirmed that obtained values of cycles to rupture were at least 585 000 cycles. Change of fatigue properties in dependence on heat treatment of the used steel. Research limitations/implications: The experiment was limited by occurrence a void in cast alloys. Practical implications: The results may be utilized for application of the investigated material in process of manufacturing. Originality/value: These results contribute to explanation of fracture mechanism of micro-alloyed 23MnB4 steel.

3

The influence of the surface defects concerning drawing processes of the micro-alloyed steel

Rusz S., Kubicek M., Pastrnak M., Filipec P., Greger M., Petruska J., Janicek L.

Hutnik, Wiadomości Hutnicze

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2005

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Vol. 72, nr 2

118-121

EN

This paper provides a report on the effect of the pass reduction concerning the strain course in wires made of micro-alloyed steel, 23MnB4; namely successively investigating three particular points - before the die, in the die itself, and at the die output section so that the strain condition is mapped in its very detail, which is of fundamental importance for the behaviour of surface defects in the process of drawing the wire.

PL

Artykuł przedstawia wpływ gniotu w przebiegu odkształcenia drutów wykonanych ze stali mikrostopowej 23MnB4, mianowicie w trzech następujących po sobie punktach: przed ciągadłem, w ciągadle i w strefie wyjścia z ciągadła, w ten sposób warunki odkształcenia zostały zobrazowane szczegółowo. Ma to istotny wpływ na zachowanie defektów powierzchni w procesie ciągnienia drutów.