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'The Effect of Various Heat Treatn1ents on the Hardness of Some Nigerian Steels

Inegbenebor, A.O. (1996) 'The Effect of Various Heat Treatn1ents on the Hardness of Some Nigerian Steels. ::Journal of Engineering Research, 4 (2). pp. 193-210.

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Two indig~nous steel, NST 37-2 and NST 60Mn were sruJi~d ro detem1ine rhe effect of various heat treannent!: on c.'leir hardness. Resulrs indicate lha! warer seems to be m•l>t efficient quenching medium where maximum hardne$s is rcquin:d. Howel'er, when: har\iness can be sacrificed, mineral oil can be used for qucn.;hing. NST 60Mn SLC:el, wilh higher manganese and carbon contents sbowed greater hardness at fast cooling rate. This grearer hardness was due to the greater amount of mancnsitic rransfonnation and precipitation hardening of carbides (Fe3C)._ Tbe air-cooled samples did nor sh'"' much increase in hardness ·because, !he stee-ls transfoml more imo ferrit~ and \'tl)' lirrJc of pearlire. The lechnologi;:~l importance of rhe results obuined in relation to Nigerian Stmcrural Adjusuncnl Programme (SAP} are discussed.

Item Type: Article
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: Mrs Hannah Akinwumi
Date Deposited: 27 Mar 2015 14:00
Last Modified: 27 Mar 2015 14:03

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