UTK MSE 201 - Chapter 11 - Thermal Processing of Metal Alloys (11 pages)

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Chapter 11 - Thermal Processing of Metal Alloys



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Chapter 11 - Thermal Processing of Metal Alloys

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Lecture Notes


Pages:
11
School:
The University of Tennessee, Knoxville
Course:
Mse 201 - Introduction to Materials Science and Engineering

Unformatted text preview:

Introduction to Materials Science Chapter 11 Thermal Processing of Metal Alloys Chapter 11 Thermal Processing of Metal Alloys Designer Alloys Utilize heat treatments to design optimum microstructures and mechanical properties strength ductility hardness Strength in steels correlates with how much martensite remains in the final structure Hardenability The ability of a structure to transform to martensite Precipitation hardening Annealing Stress Relief More on Heat Treatment of Steels Precipitation Hardening University of Tennessee Dept of Materials Science and Engineering 1 Introduction to Materials Science Chapter 11 Thermal Processing of Metal Alloys Annealing Annealing A heat treatment process in which a material is heated to an elevated temperature allowed to dwell there for a set amount of time and then cooled with a controlled rate Stages of annealing Heating to required temperature Holding soaking at constant temperature Cooling The time at the high temperature soaking time is long enough to allow the desired transformation diffusion kinetics to occur Cooling is done slowly to avoid warping cracking of due to the thermal gradients and thermo elastic stresses within the or even cracking the metal piece Purposes of annealing Relieve internal stresses Increase ductility toughness softness Produce specific microstructure University of Tennessee Dept of Materials Science and Engineering 2 1 Introduction to Materials Science Chapter 11 Thermal Processing of Metal Alloys Examples of Heat Treatment Process Annealing used to revert effects of workhardening by recovery and recrystallization and to increase ductility Heating is usually limited to avoid excessive grain growth and oxidation Stress Relief Annealing used to eliminate minimize stresses arising from o Plastic deformation during machining o Non uniform cooling o Phase transformations between phases with different densities Stress relief annealing allows these stresses to relax Annealing temperatures are



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