Abstract
Despite more than hundred years of research the quantitative relation between microstructure and tensile strength of pearlitic grey irons is not fully understood. Relations found in literature mainly consist of formulas based on regression analysis of chemical composition and wall thickness. Microstructural features like size and shape of the graphite as well as pearlite fineness are seldom included in these equations. In this paper is presented an experimental correlation between microstructure and tensile strength for a low alloyed grey iron including the influence of course of solidification, pearlite hardness and graphite size and shape. The experimental material consists of two six-cylinder engine blocks which were gravity cast in horizontally parted green sand moulds. The alloy is similar to EN-GJL-200 but with addition of Cr. Measured values of hardness and tensile strength have been correlated to simulated values of solidification time and cooling rate at pearlite transformation with excellent agreement. It was also possible to confirm these findings by observation of the tensile test bar fracture surfaces. The main conclusions are: - Tensile strength is mainly dependent on solidification time and the related graphite flake size. - Hardness is mainly dependent on pearlite transformation rate and the related pearlite fineness.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
