Heat Treatment

May 5th, 2015
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Steel is the most important engineering and construction material; it accounts for approximately 80 % of all metals produced. Steel has attained this degree of prominence because it combines strength, ease of fabricability into many shapes, and a wide range of properties along with low cost.

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Heat TreatmentHeat TreatmentOBJECT:To perform a Jominy end-quench test in order to observe heat treatment hardening and prepare the hardenability curve for a steel bar.THEORY:Steel is the most important engineering and construction material; it accounts for approximately 80 % of all metals produced. Steel has attained this degree of prominence because it combines strength, ease of fabricability into many shapes, and a wide range of properties along with low cost. Also it is possible to give a wide range of mechanical properties to steels by changing the size ad shape of the grains or changing its microconstituents. This property owes to several different ways that austenite can decompose.Fundamentally, all steels are alloys of iron and carbon. So-called plain carbon steels also generally have small but specified amounts of phosphorus and sulfur. Alloy steels are those which contain specified percentages of other elements in their chemical compositions. [pic]Figure 1. Iron-Carbon Equilibrium Diagram [1]HARDENABILITY:In general strength of a given steel is proportional to its hardness; the higher the hardness, the stronger the steel. The carbon content of a steel determines the maximum hardness attainable. The most important factor influencing the maximum hardness is mass of the metal being quenched. In a small section, the heat is extracted quickly, thus exceeding the critical cooling rate of the specific steel. The critical cooling rate is that rate of cooli

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