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- W218054330 abstract "The high affinity of chromium to oxygen is the main deterrent force for P/M parts manufacturers for the wider utilization of chromium lowalloyed powders that possess a high performance/cost ratio of the produced sintered steels. The thermodynamic calculations of the required sintering atmosphere composition/purity during sintering in nitrogen/hydrogen atmosphere (10% of H2) at a temperature of 1120°C, paying special attention to carbothermic reduction processes, indicate strict requirements for the sintering atmosphere purity for such a highly sensitive prealloyed powder. Continuous atmosphere monitoring (CO/CO2/H2O content measurements), performed directly in the container with the specimens for the Fe-3Cr-0.5Mo-0.5C powder system during the whole sintering cycle, indicates pronounced carbothermic reduction at the beginning of sintering. It was shown that carbothermic reduction and formation, esp. CO/CO2, occurs in two different temperature ranges, emphasizing the importance of the carbon role in carbothermic reduction of chromium oxide for this system, involving both direct and indirect carbothermic reduction mechanisms. Three peaks of dew point profile can be distinguished during the sintering cycle as well. Sintering at a different atmosphere purity (dew-point of above -45 and -65°C respectively) indicate a pronounced difference in the resulting specimens oxidation, as was confirmed by metallography and SEM+EDX analysis of the fracture surfaces. Results obtained indicate sufficient specimen purity even during low-temperature sintering (at 1120°C) if proper atmosphere purity is maintained during the different sintering stages." @default.
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- W218054330 date "2008-01-01" @default.
- W218054330 modified "2023-10-09" @default.
- W218054330 title "STUDY OF REDUCTION/OXIDATION PROCESSES IN Cr-Mo PREALLOYED STEELS DURING SINTERING BY CONTINUOUS ATMOSPHERE MONITORING" @default.
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