About engineering goodluck, Summaries of Engineering

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Heat Treatment of Metal

What is Heat Treatment?

• (^) Heat treatment is a process used to alter the properties of a material through the application of controlled heating and cooling. It involves heating the material to a specific temperature and then subjecting it to a predetermined cooling process.

Heat Treatment Process

• (^) Is the process of heating metal without letting it reach its molten, or melting stage, and then cooling the metal in a controlled way to select desired mechanical properties.

Heat Treatment Process Below are the Heat Treatment Process: A. Stress Relief Treatment B. Annealing C. Normalizing D. Quenching E. Tempering F. Hardening

B. Annealing

• (^) Annealing is a heat treatment that is used to negate the effects of cold work-that is, to soften and increase the ductility of a previously strain-hardened metal. It is commonly utilized during fabrication procedures that require extensive plastic deformation, to allow a continuation of deformation without fracture or excessive energy consumption.
• (^) There’s also a heat treatment known as full annealing, it is often utilized in low and medium-carbon steels that will on machined or will experience extensive plastic deformation during a forming operation.

C. Normalizing

• (^) Steels that have been plastically deformed by, for example, a rolling operation, consist of grains of pearlite (and most likely a proeutectoid phase), which are irregularly shapes and relatively large, but vary substantially in size.
• (^) An annealing neat treatment called normalizing is used to refine the grains (i.e., to decrease the average grain size) and produce a more uniform and desirable size distribution, fine- grained pearlitic steels are tougher than coarse-grained ones.

D. Quenching

• (^) Severity of quench is a term often used to indicate the rate of cooling, the more rapid the quench, the more severe the quench. Of the three most common quenching media-water, oil, and air- water produces the most severe quench, followed by oil, which is more effective than air.
• (^) The degree of agitation of each medium also influences the rate of heat removal.

E. TEMPERING

• (^) Tempering is a process whereby a metal is precisely heated to below the critical temperature, often in air, a vacuum, or inert atmospheres. The exact temperature varies according to the amount of hardness that needs to be reduced

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