Title

OPTIMIZATION OF MICROSTRUCTURE FOR IMPROVED DAMAGE TOLERANCE AND WEAR CHARACTERISTICS OF BACK-UP ROLLS

OPTIMIZATION OF MICROSTRUCTURE FOR IMPROVED DAMAGE TOLERANCE AND WEAR CHARACTERISTICS OF BACK-UP ROLLS

Authorship

Marsden, Kevin; Kapadia, Behram; Khan, Kalyan; Goyanes, Frank

Marsden, Kevin

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Kapadia, Behram

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Khan, Kalyan

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Goyanes, Frank

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DOI

10.5151/2594-5297-0073

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Abstract

This investigation characterized the microstructure of back-up roll alloys as a function of thermal history and then identified structure/property relationships for these materials. Commercially produced cast and forged steel back-up rolls made in both 3%Cr and 5%Cr compositions were evaluated by optical and high resolution electron microscopy. Mechanical testing including axial fatigue and fracture toughness (KIC) was performed on selected samples. The microstructure developed during final heat treatment established comparable mechanical properties in both cast and forged rolls. The carbide morphology exhibited some correlation to the observed behavior of these materials, but the processing history of each roll also affected test results. From the results of this study, it is expected that back-up rolls, cast or forged, 3% Cr or 5% Cr, will exhibit similar performance in service. Any differences observed can be attributed to deficiency in casting and/or heat treatment.

This investigation characterized the microstructure of back-up roll alloys as a function of thermal history and then identified structure/property relationships for these materials. Commercially produced cast and forged steel back-up rolls made in both 3%Cr and 5%Cr compositions were evaluated by optical and high resolution electron microscopy. Mechanical testing including axial fatigue and fracture toughness (KIC) was performed on selected samples. The microstructure developed during final heat treatment established comparable mechanical properties in both cast and forged rolls. The carbide morphology exhibited some correlation to the observed behavior of these materials, but the processing history of each roll also affected test results. From the results of this study, it is expected that back-up rolls, cast or forged, 3% Cr or 5% Cr, will exhibit similar performance in service. Any differences observed can be attributed to deficiency in casting and/or heat treatment.

Keywords

Backup rolls; Microstructure; Performance.

Backup rolls; Microstructure; Performance.