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DISCUSSIONIn this experiment, Jominy end-quench test was carried out to investigate thehardenability of an alloy steel, grade 7225. Hardenability of an alloy steel was the degreeof certain hardness that the alloy steel can achieved after undergoes a heat treatmentprocess. When the alloy steel was quenched, the end of the alloy steel was cooled by a jetof water while the other part of the alloy steel did not cool rapidly as the distance furtheraway from the quenched end. The cooling rate was highest at the quenched end. The partwith lower cooling rate allow the austenite to form into structure like martensite orbainite. This produce a material with softer core and harder surface. The softer part wascause by formation of great amount of soft pearlite or bainite due to low cooling rate.Presence of nickel, chromium, and molybdenum in the alloy steel reduce the formation ofaustenite to bainite and allow more martensite to form as the distance from the quenchend decreases and the cooling rate was high.