Abstract
This work presents an attempt to study the effect of manganese addition and heat treatment on higher carbon austenitic cast iron to form high manganese austenitic cast iron with reduced nickel content (Mn-Ni-resist) on mechanical properties. The combination on microstructure (microsegregation), mechanical properties and the relationship of heat treatment on the alloy were analyzed. For this purpose Mn-Ni-resist (4.50C, 2.64Si, 6.0 Mn, 10 Ni) was melted and cast in the form of Y-block test pieces. Four different heat treatment procedures were applied to the as-cast to investigate the effect of alloy modifications on Mn-Ni-resist. Optical and scanning electron microscopies were used for microstructure investigation. To determine the mechanical properties tensile test and hardness test were carried out. The result indicates both composition and heat treatment affect the performance of Mn-Ni-resist intensively. Microprobe analysis shows some silicon segregation near the graphite and practically little segregation of manganese. The increase in manganese contents developed some fractions of segregated carbide structures in LTF region located at austenite eutectic cell frame, which caused the tensile properties to drop in a small range. Application of annealing heat treatment gradually changed the carbide formation, so is the material’s strength.
Highlights
Researchers have shown an increased interest in austenitic cast iron study
Due to constant demand for high performances materials austenitic cast iron has been chosen for various engineering applications as substituted material to steel, as it offer an outstanding combination of properties in withstanding the effects of corrosion, heat and wear [1,2,3,4,5]
The mould was made by using Y block shaped pattern with minimum thickness of 30mm was prepared by using a pattern as in Fig according to ASTM standard for austenitic cast iron [7, 8] in the green sand mould
Summary
Researchers have shown an increased interest in austenitic cast iron study. Due to constant demand for high performances materials austenitic cast iron has been chosen for various engineering applications as substituted material to steel, as it offer an outstanding combination of properties in withstanding the effects of corrosion, heat and wear [1,2,3,4,5]. The high composition of austenitic matrix in microstructure is contributed by the influence of nickel contained in the composition that acts as austenite matrix promoter [6]. The used of nickel as main austenite promoter suffers from major drawbacks associated to its high price production
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