Parameters Controlling the Oxide Reduction during Sintering of Chromium Prealloyed Steel
Temperature intervals of oxide reduction processes during sintering of the Fe-3%Cr-0.5%Mo prealloyed powder using continuous monitoring of processing-exhaust gas composition (CO, CO2, and H2O) were identified and interpreted in relation to density (6.5–7.4 g/cm3), sintering temperature (1120 and 120...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | Advances in Materials Science and Engineering |
| Online Access: | http://dx.doi.org/10.1155/2013/789373 |
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| author | Monika Hrubovčáková Eva Dudrová Eduard Hryha Margita Kabátová Jarmila Harvanová |
| author_facet | Monika Hrubovčáková Eva Dudrová Eduard Hryha Margita Kabátová Jarmila Harvanová |
| author_sort | Monika Hrubovčáková |
| collection | DOAJ |
| description | Temperature intervals of oxide reduction processes during sintering of the Fe-3%Cr-0.5%Mo prealloyed powder using continuous monitoring of processing-exhaust gas composition (CO, CO2, and H2O) were identified and interpreted in relation to density (6.5–7.4 g/cm3), sintering temperature (1120 and 1200°C), heating and cooling rates (10 and 50°C/min), carbon addition (0.5/0.6/0.8%), type (10%H2-N2, N2), and purity (5.0 and 6.0) of the sintering atmosphere. The progress in reduction processes was evaluated by oxygen and carbon contents in sintered material and fracture strength values as well. Higher sintering temperature (1200°C) and density <7.0 g/cm3 resulted in a relative decrease of oxygen content by more than 80%. The deterioration of microclimate purity of inner microvolumes of compacts shifted the thermodynamic equilibrium towards oxidation. It resulted in a closing of residual oxides inside interparticle necks. The reducing ability of the N2 atmosphere can be improved by sintering in a graphite container. High density of 7.4 g/cm3 achieved by double pressing indicated a negative effect on reduction processes due to restricted replenishment of the microclimate atmosphere with the processing gas. In terms of strength properties, carbon content should not be higher than ~0.45%. |
| format | Article |
| id | doaj-art-b3befbdda90b494d83fd29aedb33ddd0 |
| institution | Kabale University |
| issn | 1687-8434 1687-8442 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
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| series | Advances in Materials Science and Engineering |
| spelling | doaj-art-b3befbdda90b494d83fd29aedb33ddd02025-02-03T06:14:15ZengWileyAdvances in Materials Science and Engineering1687-84341687-84422013-01-01201310.1155/2013/789373789373Parameters Controlling the Oxide Reduction during Sintering of Chromium Prealloyed SteelMonika Hrubovčáková0Eva Dudrová1Eduard Hryha2Margita Kabátová3Jarmila Harvanová4Institute of Materials Research of SAS, Watsonova 47, 040 01 Košice, SlovakiaInstitute of Materials Research of SAS, Watsonova 47, 040 01 Košice, SlovakiaDepartment of Materials and Manufacturing Technology, Chalmers University of Technology, Rännvägen 2A, 412 96 Göteborg, SwedenInstitute of Materials Research of SAS, Watsonova 47, 040 01 Košice, SlovakiaUniversity of Veterinary Medicine and Pharmacy, Komenskeho 73, 041 81 Košice, SlovakiaTemperature intervals of oxide reduction processes during sintering of the Fe-3%Cr-0.5%Mo prealloyed powder using continuous monitoring of processing-exhaust gas composition (CO, CO2, and H2O) were identified and interpreted in relation to density (6.5–7.4 g/cm3), sintering temperature (1120 and 1200°C), heating and cooling rates (10 and 50°C/min), carbon addition (0.5/0.6/0.8%), type (10%H2-N2, N2), and purity (5.0 and 6.0) of the sintering atmosphere. The progress in reduction processes was evaluated by oxygen and carbon contents in sintered material and fracture strength values as well. Higher sintering temperature (1200°C) and density <7.0 g/cm3 resulted in a relative decrease of oxygen content by more than 80%. The deterioration of microclimate purity of inner microvolumes of compacts shifted the thermodynamic equilibrium towards oxidation. It resulted in a closing of residual oxides inside interparticle necks. The reducing ability of the N2 atmosphere can be improved by sintering in a graphite container. High density of 7.4 g/cm3 achieved by double pressing indicated a negative effect on reduction processes due to restricted replenishment of the microclimate atmosphere with the processing gas. In terms of strength properties, carbon content should not be higher than ~0.45%.http://dx.doi.org/10.1155/2013/789373 |
| spellingShingle | Monika Hrubovčáková Eva Dudrová Eduard Hryha Margita Kabátová Jarmila Harvanová Parameters Controlling the Oxide Reduction during Sintering of Chromium Prealloyed Steel Advances in Materials Science and Engineering |
| title | Parameters Controlling the Oxide Reduction during Sintering of Chromium Prealloyed Steel |
| title_full | Parameters Controlling the Oxide Reduction during Sintering of Chromium Prealloyed Steel |
| title_fullStr | Parameters Controlling the Oxide Reduction during Sintering of Chromium Prealloyed Steel |
| title_full_unstemmed | Parameters Controlling the Oxide Reduction during Sintering of Chromium Prealloyed Steel |
| title_short | Parameters Controlling the Oxide Reduction during Sintering of Chromium Prealloyed Steel |
| title_sort | parameters controlling the oxide reduction during sintering of chromium prealloyed steel |
| url | http://dx.doi.org/10.1155/2013/789373 |
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