Development of Fe-11Al-xMN alloy steel on cryogenic temperatures

This research is focused on increasing the reliability of Fe-11Al-Mn by combining properties Mn and superiority Fe-Al-C under cryogenic temperature. Three alloys with compositions 15 wt % (F15), 20 (F20), 25 (F25) were investigated. The process uses liquid nitrogen in a temperature range 0–196 °C. Hardness testing using Vickers method SEM was used to analyze microstructure. X-ray diffraction (XRD) conducted ensure alloy phase corrosion carried out three-electrode cell polarization method. With addition Mn, hardness decreased from 331.50 VHN at 297.91 %. value tensile strength fracture elongation values 742.21 MPa, 35.3 EI; 789.03 41.2 894.42 50.2 EI, for F15, F20, F25, respectively. An important factor improving performance materials impact mechanism. resulting toughness increased 2.85 J/mm2 3.30 F.15 element increases resistance alloy. lowest rate occurs 0.016 mm/year. Based results, F25 has highest mechanical three types equivalent SS 304 stainless steel. microstructure similar between before after treatment, this condition showed that did not change during process. From overall Fa-11Al-Mn promising candidate material applications working temperatures optimizing content