Micro Structure and Mechanical Properties of Fe-Cr-Mn alloy castings for biomaterials Ratna Kartikasari and La Ode Muhammad Fuad Syuhada Baeri
Institut Teknologi Nasional Yogyakarta
Abstract
Fe-Cr-Mn alloy is one type of stainless steel that is being considered as a replacement for conventional stainless steel (Fe-Cr-Ni alloy). Manganese (Mn) acts as an austenite stabilizer, increasing hardness and strength. Economically, Mn is relatively inexpensive, making it a viable alternative to expensive Ni. This study aims to analyze the effect of manganese content on microstructure and mechanical properties of Fe-Cr-Mn alloy steel casting. The Characterization performed includes chemical composition, microstructure, hardness, tensile strength, impact toughness, and wear testing. The result of the chemical composition test showed that the Fe-Cr-Mn alloys in this study contained 10.02%, 15.04%, and 20.09% Mn, respectively. The microstructure of the Fe-Cr-Mn allloy steel casting consists of austenite and ferrite, placing it in the duplex stainless steel catagory. The specimen with a Mn content of 20% exhibited the highest hardness value of 358.3 VHN, tensile strength of 682 MPa, an elongation of 26.57%, impact value of 0.21J/mm2, and wear resistance of 0.000156 mm3/kg.m.
