International Research Journal of Innovations in Engineering and Technology - IRJIET International Open Access, Monthly, Peer Reviewed, Reputed Journal ISSN (online): 2581-3048

Impact Factor (2025): 6.9

DOI Prefix: 10.47001/IRJIET

The Effect of Nozzle Distance and Transverse Speed of the Flame Hardening Process on Hardness Values in Low Carbon Steel

Abstract

Flame hardening is a simple and low-cost surface modification method for increasing the local hardness of knifes product. The mechanical strength yield from manual flame hardening is defective and not uniform. This study investigates the effect of the flame oxy-acetylene nozzle transverse speed on the hardness of quenched chopper knife made low carbon steel.  The firing distance of the nozzle was set to achieve the austenite temperature of low-carbon steel. Microstructure testing was carried out to analyze microstructural changes. The results show that the higher nozzle speed caused lower temperature heating and caused incomplete austenization. Incomplete austenization caused low hardness of the chopper knife, and the product didn’t meet the standard hardness value.

Country : Indonesia

1 Norman Iskandar2 Sulardjaka

  1. Mechanical Engineering, Diponegoro University, Semarang, Indonesia
  2. Mechanical Engineering, Diponegoro University, Semarang, Indonesia

IRJIET, Volume 6, Issue 10, October 2022 pp. 85-89

doi.org/10.47001/IRJIET/2022.610013

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