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.
An Experimental Behavioral Study of Ductile Cast Iron Microstructure and its Mechanical Properties
72 An Experimental Behavioral Study of Ductile Cast Iron Microstructure and its Mechanical Properties Raghavendra N, Pramod R Sharma, H Yogish and Varuna Srivastava 1, 2, 4 Asst. Professor, Department of Mechanical Engineering, MVJ College of Engineering, Bangalore, India Associate Professor, Department of Mechanical Engineering, SJ College of Engineering, Mysore, India nraghavendra85@gmail.com ________________________________________________________________________________________
A New Vacuum Pressure Infiltration CFRP Method and Preparation Experimental Study of Composite
In order to prepare a carbon-fiber-reinforced polymer composite (CFRP) with ideal microstructure and properties, a new vacuum pressure infiltration CFRP method is proposed based on an analysis of existing CFRP preparation process methods. Research on composite material preparation systems was carried out by using this new method principle. The system mainly includes a fiber pre-forming module, a vacuum heating infiltration module, a hot-press curing molding module, and a data acquisition control module. Under the conditions of natural curing at 0 MPa + 6 h + 25 °C, vacuum heating curing at –0.05 MPa + 30 min + 80 °C, and hot-press curing at 0.7 MPa + 5 min + 50 °C, a two-dimensional (2D) CFRP with excellent microstructure and properties was successfully prepared. Observing the microstructure of the prepared composite material, it can be found that the inside of the composite material was sufficiently and uniformly infiltrated, and common preparation defects such as holes and delamination were effectively controlled. Through the performance test, the bending strength of the material reached 790 MPa.