Preparation effect of mould systems on microstructure and mechanical properties of spheroidised graphite iron
This study is based on evaluation of microstructure and mechanical properties such as tensile strength, Brinell hardness and Charpy impact test of as-cast spheroidal graphite iron using sandwich techniques in different mould systems viz. green sand mould, dry sand mould and CO2 sand mould under varying cooling rates.
The Effect of Different Inoculant Material on Microstructure & Mechanical Property of SG 500/7 Iron in Green Sand Casting Process
Microstructural modification of spheroidal cast iron alloys by various inoculants is a well-known practice to improve their mechanical properties. The microstructure of nodular cast irons is represented by the presence of spheroidal graphite nodules. Graphite nodularity decreased as the Melt was held for longer periods of time before casting after inoculation and nodularisation treatments. The microstructure consists of graphite nodules Embedded in austenitic matrix and carbides. Inoculants play a great role in changing the structure–properties of ductile iron. In this research paper we try to figure out impact of various inoculant on Micro structure & Mechanical Property of SG 500/7 in Green sand Casting. For this Experiment we select mainly three type of Inoculant: Sr Based, La Based, & Ca-Ba based Inoculant. Micro structure Image analyses have been carried out to measure nodule count and nodules dimensions.
Effect of Heat Treatment on Microstructure and Properties of Semi-solid Chromium Cast Iron
Semi-solid processed 18% Cr and 27% Cr cast irons were produced by using copper cooling plate and metal mold. A series of experiments were carried out to clarify the effect of heat treatment on microstructure, hardness, wear properties, and corrosion characteristics. The results show that 27% Cr alloys possess better abrasive resistance than 18% Cr alloys due to higher carbide volume under all the conditions when tested by dry sand rubber wheel with silica abrasive. However 18% Cr alloys show higher wear resistance than 27% Cr alloys when using super hard alloy disk against the specimen plate surface. The harder disk indent into the carbides, leads to spalling and pitting, and therefore greater wear rate. For the corrosion test result, 27% Cr alloys have better corrosion resistance than 18% Cr alloys as a result of higher chromium content. A combination of semi-solid processing and heat treatment improves wear resistance and corrosion resistance of chromium cast iron.