STUDY OF YTTRIA ADDITION ON ISOTHERMAL OXIDATION RESISTANCE OF FERITIC ODS STEEL Fe-16Cr-4Al-1Ni-0.5Ti-xY2O3 AT TEMPERATUR 800OC
Population growth, economy and rapid urbanization will lead to increased energy needs in the future. The United Nations (UN) estimates that the world's population will increase from 7.6 billion to 9.8 billion by 2050. World electricity demand will increase 43% in the next 20 years. While electr...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/40348 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Population growth, economy and rapid urbanization will lead to increased energy needs in the future. The United Nations (UN) estimates that the world's population will increase from 7.6 billion to 9.8 billion by 2050. World electricity demand will increase 43% in the next 20 years. While electricity production accounts for 37% of CO2 emissions or around 10 tons. Nuclear energy is one alternative to overcome this. Nuclear energy only produces 29 tons of CO2e / GWh. Currently the technology of Nuclear Power Plants (NPP) has developed towards the IV-gene. These developments demand radiation-resistant materials and high-temperature operations. Ferritic steel Oxide Dispersion Strengthened (ODS) is one of the potential to become IV-gene reactor cladding material. ODS ferritic steel has tensile properties, creep resistance, and good radiation resistance and high temperature oxidation resistance. In this study studied the effect of yttria composition on isothermic oxidation resistance of ferritic steel ODS Fe-16Cr-4Al-1Ni-0.5Ti-xY2O3 at a temperature of 800oC.
The series of experiments began with the manufacture of ODS Fe-16Cr-4Al-1Ni-0.5Ti ferritic steel with variations in the addition of Y2O3 by 0.1%, 0.4% and 1% through powder metallurgy. Compound element is weighed with a digital balance then mechanical alloying is carried out with the planetary ball mill. The next process is cold compaction with 10 tons shop press with a pressure of 4 tons and a holding time of 4 minutes. The results of compacting are sintered by using a horizontal tube furnace in an inert atmosphere (high purity argon). Sintering temperature at 1000oC with a holding time of 6 hours. Isothermic oxidation testing uses a horizontal tube furnace in an atmospheric atmosphere. The temperature of the test is 800oC with a time variation of 5; 20; 50; 100 hours. Characterization was carried out using optical microscopy, XRD, SEM-EDS and Vicker Hardness Test Machine.
The final test found total alloy 1 oxide thickness was 461.03 ?m with an outer layer of 91.98 ?m, alloy 2 total oxide thickness of 407.10 ?m with an outer layer of 117.38 and in alloy 3 the total oxide thickness was 443.93 ?m with the outer layer of 146.92. The addition of Y2O3 increases the speed of its outer oxide growth (outer layer). Alloy 1 is found to have porous in the oxide layer, while alloy 3 is formed with the largest vacuo or hole. Thus, alloy 2 shows the best oxidation resistance. The increase in yttria composition also increases the hardness of ODS as sintered ferritic steel. Analysis of the correlation value (R2) shows the rate of kinetics following parabolic equations with oxidation constants in addition of 0.1%, 0.4%, 1% respectively is 1967.8; 1587,2; 1880,9 ?m2.jam-1. In addition, the oxide products formed are Fe2O3, Fe3O4 and Al2FeO4. |
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