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EFFECT OF SINTERING ATMOSPHERE ON THE MICROSTRUCTURE OF HIGH Cr-ALLOYED SINTERED STAINLESS STEEL

Ruslan Shvab, Ola Bergman, Sven Bengtsson

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Abstract

The influence of sintering atmosphere on the microstructure of high Cr- alloyed sintered stainless steel was investigated. Two regimes using three sintering atmospheres were applied. Sintering in pure hydrogen was evaluated as unsatisfactory due to the strong decarburization of the compact surface. Sintering in mixed N2-H2 atmosphere resulted in more acceptable microstructure with small austenitic grains and fine distributed small precipitates. Some decarburization at the surface was also observed. Avoidance of surface decarburization was obtained by using N2-H2 atmosphere admixed with 0.5% of CH4. Material sintered in such an atmosphere is characterized by microstructure with fine grains and well distributed fine precipitates. Its surface hardness showed the highest values among all obtained materials.

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The influence of sintering atmosphere on the microstructure of high Cr- alloyed sintered stainless steel was investigated. Two regimes using three sintering atmospheres were applied. Sintering in pure hydrogen was evaluated as unsatisfactory due to the strong decarburization of the compact surface. Sintering in mixed N2-H2 atmosphere resulted in more acceptable microstructure with small austenitic grains and fine distributed small precipitates. Some decarburization at the surface was also observed. Avoidance of surface decarburization was obtained by using N2-H2 atmosphere admixed with 0.5% of CH4. Material sintered in such an atmosphere is characterized by microstructure with fine grains and well distributed fine precipitates. Its surface hardness showed the highest values among all obtained materials.

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Available abstract

The influence of sintering atmosphere on the microstructure of high Cr- alloyed sintered stainless steel was investigated. Two regimes using three sintering atmospheres were applied. Sintering in pure hydrogen was evaluated as unsatisfactory due to the strong decarburization of the compact surface. Sintering in mixed N2-H2 atmosphere resulted in more acceptable microstructure with small austenitic grains and fine distributed small precipitates. Some decarburization at the surface was also observed. Avoidance of surface decarburization was obtained by using N2-H2 atmosphere admixed with 0.5% of CH4. Material sintered in such an atmosphere is characterized by microstructure with fine grains and well distributed fine precipitates. Its surface hardness showed the highest values among all obtained materials.

Key concepts: Decarburization, Sintering, Microstructure, Materials science, Metallurgy, Atmosphere (unit), Austenite, Hydrogen

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EFFECT OF SINTERING ATMOSPHERE ON THE MICROSTRUCTURE OF HIGH Cr-ALLOYED SINTERED STAINLESS STEEL — Research Paper | ScholarLens