159x Filetype PPT File size 0.44 MB Source: site.iugaza.edu.ps
Objectives •To study the effect of the cooling rate and the amount of alloying elements on the micro structure and the mechanical properties ( Rockwell hardness ) of medium carbon steel. •To know the several techniques of heat treatment. What is Heat Treating ? • Controlled Heating And Cooling of Metal to Change Its Properties and Performance. Through: • Change in Microstructure • Change in Chemistry or Composition • It involves the use of heating, normally to extreme temperatures, to achieve a desired result such as hardening or softening of a material. Why Heat Treat? • To improve Toughness • To increase Hardness • To increase Ductility • To improve Machinability • To refine Grain Structure • To remove Residual Stresses Heat treatment techniques include Case Hardening Tempering Annealing normalizing Quenching Case Hardening •Case Hardening: is the process of hardening the surface of a metal, often a low carbon steel, by infusing elements into the material's surface, forming a thin layer of a harder alloy.
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