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Mechanical characterization of pre-fatigued freecutting steels under dynamic tension

Itabashi M., Koseki H.

Engineering Transactions

2013

Vol. 61, iss. 2

87--98

In the near future, toxic Pb will be prohibited to add to free-cutting steels. So far, many types of free-cutting steels without Pb have appeared. In order to compare dynamic mechanical properties of Pb added SUM24L steel (refer to JIS G 4804:2008, equivalent to AISI 12L14 steel) with those for Pb free SUM23 (equivalent to AISI 1215), high velocity tensile tests are carried out at a strain rate of 1 × 103s−1, at room temperature. A half of the specimens are pre-fatigued before the dynamic tensile test. This loading combination, fatigue and impact, simulates a certain service condition, normal operational loadings and an accidental dynamic loading. Tensile strength of the pre-fatigued specimens is less than that of the virgin specimens, to some extent, for both steels. Where the degradation is of almost the same level, replacement of the Pb added free-cutting steel with the Pb free steel may be possible.

Badania trwałości wierteł krętych ze stali szybkotnących

Dąbrowski L., Marciniak M., Jeleńkowski J., Oniszczuk D., Świercz R.

Mechanik

2012

R. 85, nr 8-9CD (SOS)

117--124

Hot ductility of continuously cast free cutting steels

Pytel S.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2005

z. 82

165-172

The main goal of this work was to explain the hot ductility of three continuously cast steels characterized by different amount of carbon and sulfur. Two different rolling processes were simulated under computer-controlled, high temperature deformation MTS system. Results of this study show that temperature and amount of deformation as well as geometry of sulfides are responsible for a level of hot ductility of the steels tested.