Effect of Different Vacuum Heat Treatments on the Microstructure of a Low Alloyed Sintered Steel

Róbert Bidulský; Marco Actis Grande; Zbigniew Brytan; Mario Rosso

doi:10.4028/www.scientific.net/MSF.672.293

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HomeMaterials Science ForumMaterials Science Forum Vol. 672Effect of Different Vacuum Heat Treatments on the...

Effect of Different Vacuum Heat Treatments on the Microstructure of a Low Alloyed Sintered Steel

Abstract:

The main aim of the present contribution is to show how different heat treatment conditions influence the microstructure of a Fe - [1.5Cr - 0.2Mo] - 0.6C powder system. In vacuum furnaces, the cooling rate is generally determined by the pressure of the gas (basically N2) introduced into the chamber. Different gas pressures have been applied, from 0 to 6 bars. The average cooling rates were calculated in the range of 1180 °C to 400 °C and were varying from 0.1 to 6 °C/s, according to the gas pressure. Considering the cooling rates, increasing the nitrogen pressure resulted in an increased amount of bainite/martensite microstructure. The microstructure constituents ranged from 97% pearlite + 3% ferrite in the system treated at 0 bar to 82 % martensite + 18 % bainite (with small amount of tempered martensite) in the system cooled applying N2 at 6 bars. Mechanical properties have been evaluated in terms of toughness, TRS and hardness for all processing conditions; the analysis of the properties allowed to plot graphs correlating the different properties as function of the characteristic microstructures.

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Periodical:

Materials Science Forum (Volume 672)

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293-296

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https://doi.org/10.4028/www.scientific.net/MSF.672.293

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Online since:

January 2011

Authors:

Róbert Bidulský, Marco Actis Grande, Zbigniew Brytan, Mario Rosso

Keywords:

Microstructure, Sintered Steel, Vacuum Heat Treatment

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