Effect Of Martempering Process On Plain Carbon Steel

Farahdatul Sahuda , Suhiri (2009) Effect Of Martempering Process On Plain Carbon Steel. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

The purpose of heat treating E8M-04 plain carbon steel is to change the mechanical prope1ties of steel, usually ductility, hardness, yield strength, and others. As carbon content rises the metal becomes harder and stronger but less ductile. Higher carbon content lowers steel's melting point and its temperature resistance in generaL Martempering process is use to overcome the restrictions of conventional quenching and tempering. Martempering or marquenching permits the transformation of austenite to martensite to take place at the same time throughout the structure of the metal part. This is achieved by intenupting the quench cycle; the cooling is stopped at a point above the martensite transformation region to allow sufficient time for the centre to cool to the same temperature as the surface. Then cooling is continued through the martensite region, fo llowed by the usual tempering. The different dimensions of specimens are needed for the tensile test and hardness test after the martempering process. These specimens are heating until 900°C and then quenching from the austenitizing temperature into the oil medium. Then the specimens are heated again at temperature 450°C at the di fferent temperature. Then, the tests are doing in the specimens like tensile test and hardness test. Tensile tests are used to characterize the tensile strength and yield strength. While the hardness test is to determine the hardness by measuring the depth of penetration of an indenter under a large load compared to the penetration made by a preload. Lastly, the metallographic technique is doing for samples preparation in microstructure test. The result based on the experiment is discussed and the conclusion is stated whether satisfy objectives of the mrutempering process.

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