Spheroidize Annealing and Mechanical Property Evaluation of AISI 1040 Steel

Harisha, S R and Sharma, S S and Kini, Achutha U (2017) Spheroidize Annealing and Mechanical Property Evaluation of AISI 1040 Steel. Materials Science Forum, 909. pp. 3-8. ISSN 1662-9752

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Abstract

The importance of medium carbon steels as engineering materials is reflected by the factthat out of the vast majority of engineerig grade ferrous alloys available and used in the markettoday, a large proportion of them are from the family of medium carbon steels. Typically medium carbon steels have a carbon range of 0.25 to 0.65% by weight, and a manganese content rangingfrom 0.060 to 1.65% by weight. Medium carbon steels are more resistive to cutting, welding andforming as compared to low carbon steels. From the last two decades a number of research scholarsreported the use of veritiy of heat treatments to tailor the properties of medium carbon steels. Spheroidising is the novel industrial heat treatment employed to improve formability andmachinability of medium/high carbon low alloy steels. This exclusive study covers procedure, theeffects and possible outcomes of various heat treatments on medium carbon steels. The austenitephase present in steel above the critical temperature has the tendency to form variety of non equilibrium phases depending upon the degree of supercooling or cooling rates. The near spherical or curved shaped carbides records least resistance for machining because the blunt cornered shapesare having least free energy with minimum internal stresses. There is a need to formulate the heattreatment process to tailor the characteristics in line with the application. The age old normalizingtreatment provides more nucleation sites required for so that finer spheroids are dispersed in the matrix to improve toughness with balanced bulk hardness related properties to improvemachinability. In line with requirements, the heat treatment cycle to balance mechanical andmicrostructural properties of AISI 1040 structural steel is designed. It is observed that lower spheroidizing temperature gives finer spheroids, more in number with better improvement intoughness whereas higher Spheroidization temperature reduces hardness values with lesser spheroid density, accordingly reduces strength and impact resistance. The balanced improvement inproperties may be incorporated for metal removal operations to improve productivity and tool life.

Item Type: Article
Uncontrolled Keywords: Spheroidization, Normalizing, Hardness, Impact Strength, Wear Test
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 24 Nov 2017 06:25
Last Modified: 24 Nov 2017 06:25
URI: http://eprints.manipal.edu/id/eprint/150063

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