Development of AISI A2 Tool Steel Beater Head for an Impact Crusher in a Sinter Plant View Full Text


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Article Info

DATE

2015-03-07

AUTHORS

Goutam Mukhopadhyay, Piyas Palit, Sandip Bhattacharyya

ABSTRACT

Failure analysis of a tool steel (AISI A2) beater head of an impact crusher and development of suitable heat treatment process to improve its performance have been presented. The beater heads were failing prematurely by brittle fracture from its pin-hole locations. The investigation consisted of visual inspection, fractography, chemical analysis, characterization of microstructures using optical and scanning electron microscopes (SEM), EDS analysis, and determination of micro-hardness profile. Microstructural characterization using SEM and EDS analysis revealed significant amount of coarse continuous Cr-carbide networks in the martensite matrix. It increased hardness (64 HRC) as well as heterogeneity of the matrix as depicted by the micro-hardness profile, and decreased the toughness (3 J) since coarse carbide networks are very hard and brittle. The austenitizing temperature as well as tempering temperature of heat treatment was found lower at the manufacturer’s end. The new recommended heat treatment resulted in lower amount of discontinuous Cr-carbides along with significant amount of fine precipitates uniformly distributed throughout the matrix which led to an optimum combination of both hardness (59 HRC) and toughness (6.5 J) required for the application. The beater heads manufactured following the recommended heat treatment exhibited better performance (life increased by 4 times) compared to the earlier ones. More... »

PAGES

114-121

References to SciGraph publications

  • 1994-10. Influence of microstructure on the premature failure of a second-intermediate sendzimir mill drive roll in JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
  • 2012-09-08. Cracking of a Tool Steel Guide Roller in a Bar Mill in JOURNAL OF FAILURE ANALYSIS AND PREVENTION
  • 2008-09-04. Microstructural Modifications of As-Cast High-Chromium White Iron by Heat Treatment in JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
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    URI

    http://scigraph.springernature.com/pub.10.1007/s13632-015-0192-6

    DOI

    http://dx.doi.org/10.1007/s13632-015-0192-6

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