Failure analysis of coal pulverizer mill shaft

✍ Scribed by N. Parida; S. Tarafder; S.K. Das; P. Kumar; G. Das; V.R. Ranganath; D.K. Bhattacharya

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 858 KB
• Volume: 10
• Category: Article
• ISSN: 1350-6307
• DOI: 10.1016/s1350-6307(02)00070-5

✦ Synopsis

Failure of a ball and race type coal pulverizer mill shaft has been analysed. It was found that the shaft, made of EN 25 steel, failed by fatigue. The fatigue cracks originated from the keyway area, unusually from the top edge. The presence of elongated manganese sulphide inclusions due to improper heat treatment had reduced the ductility and CVN toughness of the material, and thus made the material more prone to failure.