Abstract
The effect of manganese addition and annealing heat treatment on microstructure of austenitic cast irons with high manganese content (Mn-Ni-resist) were investigated. The complex relationship between the development of the solidification microstructures and buildup of microsegregation in Mn-Ni-resist was obtained by using microstructure analysis and EDS analysis. The annealing heat treatment was applied at 700°C up to 1000°C to investigate the effect of the annealing temperature on the microstructure. This experiment describes the characterization of microsegregation in Mn-Ni-reist was made by means of point counting microanalysis along the microstructure. With this method, the differences of silicon, manganese and nickel distribution in alloys solidified in the microstructure were clearly evidenced. The results show microstructure consists of flake graphite embedded in austenitic matrix and carbides. There is segregation of elements in the Late To Freeze (LTF) region after solidification from melting. Manganese positively with high concentration detected in the LTF region. As for heat treatment, higher annealing temperature on the Mn-Ni-resist was reduced carbide formation. The higher annealing temperature shows carbide transformed into a smaller size and disperses through the austenitic matrix structure. The size of carbide decreased with increasing annealing temperature as observed in the microstructure.
Highlights
Austenitic cast irons known as Ni-resist are an important casting materials and their use is justified by the specialist of mechanical properties which can be achieved, associated with their outstanding abilities on wistanding the effects of corrosion [1], heat and wear
Ni-resist able to stay consistence in austenitic matrix at all temperatures and have avoided this type of transformation [7]. This can be achieved by suitable addition of alloying elements, the time–temperature–transformation (T–T–T) curve is generally pushed to the right, make solidification curve at room temperature possible to miss the ‘nose’ of the T–T–T curve [1, 8, 9]
The austenite matrix in these alloys is a metallic phase with an FCC lattice, consisting of a solid solution based on iron which all the alloying elements enter
Summary
Austenitic cast irons known as Ni-resist are an important casting materials and their use is justified by the specialist of mechanical properties which can be achieved, associated with their outstanding abilities on wistanding the effects of corrosion [1], heat and wear. These materials have been used for more than 50 years, dating back to early of 1930 [2]. Nickel forms a continuous series of solid solutions with iron and has an almost unlimited solubility in austenite It will be in austenitic matrix when high temperature and at room temperature which make it successfully avoid matrix volume changes. The austenite matrix in these alloys is a metallic phase with an FCC lattice, consisting of a solid solution based on iron which all the alloying elements enter
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