REVISTA DE METALURGIA 51(1) January–March 2015, e036 ISSN-L: 0034-8570 doi: http://dx.doi.org/10.3989/revmetalm.036 The evaluation of different environments in ultra-high frequency induction sintered powder metal compacts Pınar Sari Çavdar a , Ug ˘ur Çavdar b, * a Celal Bayar University, Vocational School, Department of Constriction, Turgutlu Campus, 45400 Manisa, Turkey b Celal Bayar University, Vocational School, Department of Machinery, Turgutlu Campus, 45400 Manisa, Turkey * Corresponding author: ugur.cavdar@cbu.edu.tr Submitted: 23 March 2014; Accepted: 22 January 2015; Available On-line: ABTRACT: The application of the iron based Powder Metal (PM) compacts in Ultra-High Frequency Induction Sintering (UHFIS) was reviewed for different environments. The three different environments: atmosphere, argon and vacuum were applied to the PM compacts. Iron based PM compacts were sintered at 1120 °C for a total of 550 seconds by using induction sintering machines with 2.8 kW power and 900 kHz frequency. Micro structural properties, densities, roughness and micro hardness values were obtained for all environments. The results were compared with each other. KEYWORDS: Induction; Iron; Powder metal compact; Sintering; Ultra-high frequency induction sintering Citation / Cómo citar este artículo: Sari Çavdar, P., Çavdar, U. (2015) “The evaluation of different environments in ultra-high frequency induction sintered powder metal compacts”. Rev. Metal. 51(1): e036. doi: http://dx.doi.org/10.3989/ revmetalm.036. RESUMEN: Evaluación de diferentes ambientes en la sinterización de aleaciones pulvimetalúrgicas consolidadas por inducción de ultra-alta frecuencia. Este trabajo comprende una revisión de la aplicación de la inducción de ultra-alta frecuencia (UHFIS) en la sinterización de aleaciones pulvimetalúrgicas de base hierro para diferentes ambientes. Los tres ambientes estudiados son: atmósfera, argón y vacío aplicados a material ya consolidado. Aleaciones base hierro ya compactadas se sinterizan a temperaturas de 1120 °C durante 550 segundos por medio de máquinas de sinterizado por inducción de potencia de 2,8 kW y 900 kHz de frecuencia. Se compararán las propiedades microestructurales, y los valores obtenidos de densidad, rugosidad y microdureza para todos los ambientes estudiados. PALABRAS CLAVE: Consolidación de polvo de hierro; Hierro; Inducción; Sinterización; Sinterizado por inducción de ultra-alta frecuencia Copyright: © 2015 CSIC. This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial (by-nc) Spain 3.0 License. 1. INTRODUCTION Powder metallurgy is a continually and rapidly evolving technology embracing most metallic and alloy materials, and a wide variety of forms. Powder metals is always a competitive technology compared to others noncommercial applications. The reasons for using powder metal technology include good tol- erances, low cost, net shaping, high production rates, and controllable properties (German, 1994). In iron powder metallurgy, common sintering conditions are: 15–60 minutes at 1120–1150 °C (German, 2005). Particles of commercial iron powders for struc- tural parts are usually ≤150 μm. Iron-copper-carbon