Abstract
This research is focused on increasing the reliability of Fe-11Al-Mn by combining the properties of Mn and the superiority of Fe-Al-C under cryogenic temperature. Three Fe-11Al-Mn alloys with compositions of 15 wt % Mn (F15), 20 wt % Mn (F20), and 25 wt % Mn (F25) were investigated. The cryogenic process uses liquid nitrogen in a temperature range of 0–196 °C. Hardness testing using the Vickers method and SEM was used to analyze the microstructure. X-ray diffraction (XRD) testing was conducted to ensure the Fe-11Al-Mn alloy phase and corrosion testing was carried out using the three-electrode cell polarization method. With the addition of Mn, the Vickers hardness of the Fe-11Al-Mn alloy decreased from 331.50 VHN at 15 wt % to 297.91 VHN at 25 wt %. The value of tensile strength and fracture elongation values were 742.21 MPa, 35.3 % EI; 789.03 MPa, 41.2 % EI; and 894.42 MPa, 50.2 % EI, for F15, F20, and F25, respectively. An important factor for improving the performance of cryogenic materials is the impact mechanism. The resulting impact toughness increased by 2.85 J/mm2 to 3.30 J/mm2 for F.15 and F25, respectively. The addition of the element Mn increases the corrosion resistance of the Fe-11Al-Mn alloy. The lowest corrosion rate occurs at 25 % wt Mn to 0.016 mm/year. Based on the results, the F25 alloy has the highest mechanical and corrosion resistance of the three types of alloys equivalent to SS 304 stainless steel. The microstructure of Fe-11Al-Mn alloy was similar between before and after cryogenic temperature treatment, this condition showed that the microstructure did not change during the process. From the overall results, the Fa-11Al-Mn alloy is a promising candidate for material applications working at cryogenic temperatures by optimizing the Mn content
Highlights
The development of food technology demands that commodities remain fresh and healthy both during storage and processing
Cryogenic technology plays a vital role in surgical operations by utilizing cryogenic temperatures to separate bad cells or cancer cells, while in the field of genetic engineering, cryogenic technology provides an opportunity for cells to survive
It has been determined that the tensile test shows that the higher the Mn content indicates the higher the tensile strength, the tensile stress of the F25 specimen exceeds SS 304
Summary
The development of food technology demands that commodities remain fresh and healthy both during storage and processing. It has been found that cryogenic freezing technology provides several advantages compared to conventional freezing, cryogenic technology can prevent the destruction of adenosine triphosphate (ATP) in fresh seafood products during the storage period, can accelerate the freezing of food products such as meat and eggs, inhibits the growth of microorganisms that destroy food products, prevent damage to the nutrition of food products. Cryogenic-based technology is widely applied in various fields such as metallurgy, chemistry, petrochemical, power generation industry, and rocket propulsion, and food processing [1]. The use of low-temperature gases in a liquid state such as nitrogen, oxygen, and carbon dioxide is a necessity in cryogenic technology [2]
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