Effect of active constituents in the atmosphere on the sintering of chromium-alloyed PM steels
Paper in proceedings, 2016

Sintering of chromium-alloyed PM steels in atmospheres containing hydrogen and carbon monoxide has been studied. Thermogravimetric analysis was performed on PM steel compacts in atmospheres containing the gaseous constituents individually and when present together. Oxidation/reduction and carburization/decarburization of the compacts was evaluated based on thermogravimetric analysis complemented with bulk carbon and oxygen analysis of the samples. The results suggest that hydrogen promotes the reduction of the iron oxide layer covering the powder surface below 650 °C, the effectiveness of which improves with an increase in the concentration of hydrogen in the atmosphere. When hydrogen was additionally present, an enhancement in the reduction and carburization behavior was observed in the case of carbon monoxide containing atmospheres.

Carburization

Sintering atmosphere

Reduction

Hydrogen

Chromium-alloyed steel

Oxidation

Carbon monoxide

Author

Seshendra Karamchedu

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Eduard Hryha

Chalmers, Materials and Manufacturing Technology, Surface and Microstructure Engineering

Lars Nyborg

Chalmers, Materials and Manufacturing Technology

World Powder Metallurgy 2016 Congress and Exhibition, World PM 2016; Hamburg; Germany; 9 October 2016 through 13 October 2016

Areas of Advance

Transport

Materials Science

Subject Categories

Metallurgy and Metallic Materials

ISBN

978-189907248-4

More information

Created

12/27/2017