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Effect of Two-Stage Heat Treatment on Gray Cast Iron GC250

Effect of Two-Stage Heat Treatment on Gray Cast Iron GC250
	© 2023 by IJETT Journal
	Volume-71 Issue-1
	Year of Publication : 2023
	Author : Kwonhoo Kim, Jong-Deok Lim, Hyun-Jong Kim, Jei-Pil Wang
	DOI : 10.14445/22315381/IJETT-V71I1P219

How to Cite?

Kwonhoo Kim, Jong-Deok Lim, Hyun-Jong Kim, Jei-Pil Wang, "Effect of Two-Stage Heat Treatment on Gray Cast Iron GC250," International Journal of Engineering Trends and Technology, vol. 71, no. 1, pp. 213-216, 2023. Crossref, https://doi.org/10.14445/22315381/IJETT-V71I1P219

Abstract
This study was intended to examine the effect of two-stage heat treatment on gray cast iron GC250. The heat treatment was conducted in two stages using a high-frequency induction furnace. In the first stage, an austenitizing heat treatment was conducted by retaining the material at 920˚C in an Ar atmosphere for 2h and then cooling it with water. In the second stage, austempering heat treatment was conducted by retaining the material at 350˚C in an Ar atmosphere for 2h and then cooling it with water. To determine the physical properties of gray cast iron and alloy iron after two-stage heat treatment, the tensile strength, elongation, and hardness values (HV0.05) were measured 6 and 12 times, respectively; the average value was measured by excluding the maximum and minimum values; and the microstructure was observed through SEM. As a result, the tensile strength was measured to be 336 MPa, the surface hardness HRA 79.97, and the elongation rate 14.89%, indicating that the tensile strength was improved by 43%: the surface hardness was improved by 31%, and the elongation rate was improved by 17%, compared to the initial material GC250. The microstructures were compared through microstructure photographs.

Keywords
Gray cast iron, 2-Stage heat-treatment GC250, Surface hardness, Tensile strength, Heat treatment.

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