Title: Effect of copper and silicon addition on the ring fracture strength and hardness of sintered-hot forged carbon steels

Authors: Syed Ummer M. Thangal, K.S. Pandey, C. Natarajan, S. Shanmugam

Addresses: Department of Metallurgical and Materials Engineering, National Institute of Technology, Tiruchirappalli, 620015 Tamil Nadu, India. ' Maulana Azad National Institute of Technology, Bhopal 462 007, Madhya Pradesh, India. ' Department of Civil Engineering, National Institute of Technology, Tiruchirappalli, 620015 Tamil Nadu, India. ' Department of Mechanical Engineering, National Institute of Technology, Tiruchirappalli, 620015 Tamil Nadu, India

Abstract: Present investigation pertains to studying the effect of addition of 0.40% Cu with 1.0% Si on the fractional theoretical density and radial crushing strength for sintered-hot deformed Fe-0.8% C Powder Metallurgy ring preforms. Rings of predetermined geometry were machined out of the hot deformed preforms to various height strains. Increasing density of the rings raised the radial crushing strength. The hardness was continuously increasing with fractional theoretical density. Decreasing the initial height-to-diameter ratio substantially increased the hardness for any theoretical density attained. Majority of the rings crushed in a highly brittle manner.

Keywords: radial crushing strength; ring strength; fractional theoretical density; deflection; hardness; fractograph; fracture strength; sintering; hot forging; carbon steels; copper addition; silicon addition; powder metallurgy; ring preforms; deformation.

DOI: 10.1504/IJMPT.2009.024663

International Journal of Materials and Product Technology, 2009 Vol.34 No.3, pp.312 - 322

Published online: 14 Apr 2009 *

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