EFFECT OF ZR ADDITION ON MICROSTRUCTURE AND HIGHTEMPERATURE OXIDATION RESISTANCE OF OXIDE DISPERSION STRENGTHENED (ODS) STEEL: CRITICAL REVIEW

• Main Author: Kinata Putra, Alan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/61988
• Institution: Institut Teknologi Bandung

When an incident occurs in a nuclear reactor, the excess heat and the air vapor inside the nuclear reactor reacts with the zirco-alloy cladding material and forms the reaction Zr + 2H2O ? ZrO2 + 2H2. H = -586 kJ/mol (-140 kcal/mol). The Zr oxidation reaction is exothermic with 125kg of Zr produce 820MJ of heat and 2700 moles of Hydrogen Gas. The excess heat ignites the H2 gas thus the explosion opens the nuclear nucleus and causes the leakage of radioactive substances in the air and sea. FeCrAl ODS was planed to replace zirco-alloy material as an Accident Tolerant Fuel Cladding material because it has better high temperatures oxidation resistance, good radiation resistance and does not produce H2 gas as an oxidation product. A small amount of Zr was added to FeCrAl ODS to prevent the formation of Y-Al-O dispersed oxide which could decrease the mechanical properties of the ODS steel. However, there has been no comprehensive review of the effect of the addition of Zr on the microstructure and high-temperature oxidation resistance. This research was conducted in order to obtain a critical review of the effect of Zr addition on microstructure and high-temperature oxidation resistance. The research was conducted by collecting data from 2012-2021 and then carried out a critical review of the effect of Zr addition on microstructure and high-temperature oxidation resistance. Additional theory and data were added to match the data with the critical review obtained. The results obtained were a decrease in the size of the dispersed oxide, an increase in density, and decrease of dispersed oxides coarsening at high temperatures with addition of Zr up to 0.3 wt.%. Oxide particle that is formed was Y4Zr3O12 and Zr addition hinders the formation of Y-Al-O complex oxide. There is no relationship between the addition of Zr with the formation of shell-core microstructure and it is also found that the addition of excess Zr-ODS alloy can increase the oxidation resistance of the alloy at a temperature of 1400°C by removing ZrO2. However, Zr addition to the ODS Ferritic FeCrAl steel alloy lead to increase the weight gain and thickness at a temperature of ?1200°C of the oxide both when it is oxidized in an open-air environment and oxidized in a water vapor environment.