Title

METALLURGICAL INFLUENCE ON QUENCH DISTORTION OF SAE 52100 LONG CYLINDERS

METALLURGICAL INFLUENCE ON QUENCH DISTORTION OF SAE 52100 LONG CYLINDERS

Authorship

Maradit, Betül Pelin; Şimşir, Caner; Lübben, Thomas; Gür, Cemil Hakan

Maradit, Betül Pelin

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Şimşir, Caner

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Lübben, Thomas

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Gür, Cemil Hakan

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DOI

10.5151/2594-5327-17049

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Abstract

Quenching of steel components results in complex and hard-to-predict dimensional and shape changes (distortion). Even the components manufactured from different parts of the same semi-finished product may show significantly different distortion behaviour during quenching. The reason is thought to be non-uniform distribution of distortion potential carriers in the final component (i.e., alloying elements, segregations, residual stresses and phases) which are accumulated throughout the whole manufacturing chain. This study focuses on the effects of alloying element distribution and segregation on quench distortion. For this aim, long cylinders of various diameters were machined from 45 mm diameter SAE 52100 steel bars, and marked to define their exact positions in the initial bar. Then, the cylinders were austenitized in a vertical furnace under nitrogen atmosphere and quenched in a gas nozzle field. The coordinate measurement results show that dimensional changes deviate significantly with machining position, however, the bending magnitudes and directions do not exhibit a distinct correlation with machining position and the cylinder diameter.

Quenching of steel components results in complex and hard-to-predict dimensional and shape changes (distortion). Even the components manufactured from different parts of the same semi-finished product may show significantly different distortion behaviour during quenching. The reason is thought to be non-uniform distribution of distortion potential carriers in the final component (i.e., alloying elements, segregations, residual stresses and phases) which are accumulated throughout the whole manufacturing chain. This study focuses on the effects of alloying element distribution and segregation on quench distortion. For this aim, long cylinders of various diameters were machined from 45 mm diameter SAE 52100 steel bars, and marked to define their exact positions in the initial bar. Then, the cylinders were austenitized in a vertical furnace under nitrogen atmosphere and quenched in a gas nozzle field. The coordinate measurement results show that dimensional changes deviate significantly with machining position, however, the bending magnitudes and directions do not exhibit a distinct correlation with machining position and the cylinder diameter.

Keywords

Distortion; Gas nozzle field quenching; Shaft; SAE 52100.

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