A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Premature failure analysis of forged cold back-up roll in a continuous tandem mill
Highlights ► Metal wrapping and strip welding in work/back-up rolls contact zone caused spalling. ► MnS inclusion and pore initiated crack which propagated in milling led to spalling. ► Retained austenite conversion to α′-martensite accelerated spalling failure. ► Needle shaped carbide (Fe,Mo,Cr)7C3, may cause poor service life of back-up roll.
Abstract In this paper, premature failure of a forged back-up roll from a continuous tandem mill was investigated. Microstructural evolutions of the spalled specimen and surface of the roll were characterized by optical microscopy, X-ray diffraction, scanning electron microscopy and ferritscopy, while hardness value of the specimen was measured by Vickers hardness testing. The results revealed that the presence of pore and MnS inclusion with spherical and oval morphologies were the main contributing factors responsible for the poor life of the back-up roll. In addition, metal pick up and subsequently strip welding on the surface of the work roll were found as the major causes of failure in work roll which led to spalling occurrence in the back-up roll. Furthermore, relatively high percentage of retained austenite, say 9%, in outer surface of the back-up roll contributed spalling due to conversion of this meta-stable phase to martensite and creation of volume expansion on the outer surface through work hardening during mill campaign.
Premature failure analysis of forged cold back-up roll in a continuous tandem mill
Highlights ► Metal wrapping and strip welding in work/back-up rolls contact zone caused spalling. ► MnS inclusion and pore initiated crack which propagated in milling led to spalling. ► Retained austenite conversion to α′-martensite accelerated spalling failure. ► Needle shaped carbide (Fe,Mo,Cr)7C3, may cause poor service life of back-up roll.
Abstract In this paper, premature failure of a forged back-up roll from a continuous tandem mill was investigated. Microstructural evolutions of the spalled specimen and surface of the roll were characterized by optical microscopy, X-ray diffraction, scanning electron microscopy and ferritscopy, while hardness value of the specimen was measured by Vickers hardness testing. The results revealed that the presence of pore and MnS inclusion with spherical and oval morphologies were the main contributing factors responsible for the poor life of the back-up roll. In addition, metal pick up and subsequently strip welding on the surface of the work roll were found as the major causes of failure in work roll which led to spalling occurrence in the back-up roll. Furthermore, relatively high percentage of retained austenite, say 9%, in outer surface of the back-up roll contributed spalling due to conversion of this meta-stable phase to martensite and creation of volume expansion on the outer surface through work hardening during mill campaign.
Premature failure analysis of forged cold back-up roll in a continuous tandem mill
Rad, Hamid Reza Bakhsheshi (author) / Monshi, Ahmad (author) / Idris, Mohd Hasbullah (author) / Kadir, Mohammed Rafiq Abdul (author) / Jafari, Hassan (author)
2011-03-31
9 pages
Article (Journal)
Electronic Resource
English
Premature failure analysis of forged cold back-up roll in a continuous tandem mill
| British Library Online Contents | 2011
Using forged plate housings on 84-inch cold mill
Engineering Index Backfile | 1933
Automatic rolling technology at fully continuous cold tandem mill
| British Library Conference Proceedings | 1997
Rolling of transitions in a continuous tandem cold mill
| British Library Conference Proceedings | 2006
Vertical Vibration Characteristics Analysis of Stand Rolls System in Six-Roll Cold Tandem Mill
| British Library Conference Proceedings | 2014