Influence of microstructure on the premature failure of a second-intermediate sendzimir mill drive roll |
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Authors: | A Ray D Mukherjee B Sarkar S Mishra |
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Affiliation: | (1) Physical Metallurgy Group, Research & Development Centre for Iron & Steel, Steel Authority of India Limited, 834 002 Ranchi, India |
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Abstract: | Although a precise understanding of roll failure genesis is complex, the microstructure of a broken roll can often unravel
intrinsic deficiencies in material quality responsible for its failure. This is especially relevant in circumstances when,
even under a similar mill-operating environment, the failure involves a particular roll or a specific batch of rolls. This
paper provides a microstructural insight into the cause of premature breakage of a second-intermediate Sendzimir mill drive
roll used at a stainless steel sheet rolling plant under the Steel Authority of India Limited. Microstructural issues influencing
roll quality, such as characteristics of carbides, tempered martensite, retained austenite, etc., have been extensively studied
through optical and scanning electron microscopy, electron-probe microanalysis, image analysis, and x-ray diffractometry.
These are discussed to elucidate specific microstructural inadequacies that accentuated the failure. The study reveals that
even though retained austenite content is low (6.29 vol%) and martensite is non-acicular, the roll breakage is a consequence
of intergranular cracking caused by improper carbide morphology and distribution. |
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Keywords: | carbide segregation roll failure Sendzimir mill roll spalling tempered martensite |
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