International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 08 | Aug 2024
p-ISSN: 2395-0072
www.irjet.net
Study of Vertical Centrifugal Process of Nodular Graphite Iron through the correlation between Microstructural Analysis and Tensile Property Tejas Kumar S1,2,3, Avinash Xavy2,3 1Head of New Product Development 2Metallurgist
3Vijay Spheroidals Pvt, Bangalore, India ---------------------------------------------------------------------***---------------------------------------------------------------------
149 respectively, to study the correlation between microstructure and mechanical properties,
Abstract – In the Centrifugal casting process, the molten
metal is poured into vertical or horizontal molds which rotates at different speeds. This process causes (a) washing of dendritic or columnar structure formed at the mold metal interface and (b) separation of denser phases thrown towards peripheral region of the casting by centrifugal force. The lighter phases (like slag etc.) get separated and concentrated at the center of the casting from where it rises to the top of the casting (i.e., riser) zone. This paper investigates the effectiveness of centrifugal force on the casting process in removing slag and other impurities in Spheroidals Graphite (SG) iron castings (IS 1865:1991) of size 120 x 120 x 500 mm. It also reports the changes in (a) optical microstructures and (b) mechanical properties of Spheroidal Graphite (SG) iron castings of size 120 x 120 x 500 mm.
L2
Key Words: Vertical Centrifugal casting process, Spheroidals Graphite Iron, Microstructure, Centrifugal force, Slag, Dross
1.INTRODUCTION Foundry Industries are always target to achieve (a) defectfree castings and (b) eliminating impurities formed during melt treatment and casting process. In case of Spheroidal Graphite (SG) iron production, during magnesium (Mg) treatment, lot of slag and unwanted impurities are produced. If they are not removed properly, the cast component will fail in service and can cause cataphoric failure. Foundries are extremely keen to adopt a green and commercially viable technology to control such defects.
Fig -1: Selected casting for investigation with heat no 1022-329 (EN GJS 450/10 or SG 450/10)
1.1 Trail Setup For the investigation, trials were conducted on EN GJS 450/10 or IS 1865 SG 450/10 [with alloy chemistry C: 3.504.00, Si: 2.20-2.90, Mn: 0.3-0.6, P: 0.03-0.06, S: 0.02-0.040, Mg: 0.020-0.060] material using 250kg teapot spout ladle and vertical centrifugal Casting (CC) machine. Size of cast ingots is 120mm x120m x 500 mm (plus riser) from heat No.1022-329 is shown in Fig. 1. And five microsamples were taken from L2 (Fig 2) that is below the gating region from heat No. 0823-07217, 0823-18-557, 0823-07-203,0823-09-265 and 0723-05-
© 2024, IRJET
|
Impact Factor value: 8.315
Fig -2: Samples taken from edge of casting, below the riser L2
|
ISO 9001:2008 Certified Journal
|
Page 565