Microstructural features of prematurely failed hot-strip mill work rolls: Some studies in spalling propensity |
| |
Authors: | Amitava Ray M S Prasad S K Dhua S K Sen S Jha |
| |
Affiliation: | (1) Physical Metallurgy Group, Research and Development Centre for Iron and Steel, Steel Authority of India Limited, 834002 Ranchi, India |
| |
Abstract: | Work rolls made of indefinite chill double-poured (ICDP) iron are commonly used in the finishing trains of hot-strip mills
(HSMs). In actual service, spalling, apart from other surface degeneration modes, constitutes a major mechanism of premature
roll failures. Although spalling can be a culmination of roll material quality and/or mill abuse, the microstructure of a
broken roll can often unveil intrinsic inadequacies in roll material quality that possibly accentuate failure. This is particularly
relevant in circumstances when rolls, despite operation under similar mill environment, exhibit variations in roll life.
The paper provides an insight into the microstructural characteristics of spalled ICDP HSM work rolls, which underwent failure
under similar mill operating environment in an integrated steel plant under the Steel Authority of India Limited. Microstructural
features influencing ICDP roll quality, viz. characteristics of graphite, carbides, martensite, etc., have been extensively
studied through optical microscopy, quantitative image analysis (QIA), and electron-probe microanalysis (EPMA). These are
discussed in the context of spalling propensity and roll life. |
| |
Keywords: | failure analysis hardness hot-strip mill microstructure spalling |
本文献已被 SpringerLink 等数据库收录! |
|