Chapter5ba

Chapter5ba - _ Materials & Processes in Manufacturing...

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©2003 Bil Young 1 Materials & Processes in Manufacturing ME 151 Chapter 5 Heat Treatment ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bil Young 2 Introduction Heat treatment is the controlled heating and cooling of metals for the purpose of altering their ___________ Both physical and mechanical properties can be altered without changing _____________ Heat Treatment Classifications: Strengthening Heat Treatments Thermal processes that increase the __________ of a material Processing Heat Treatments Thermal processes that prepare a material for ____________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bil Young 3 Processing Heat Treatments Various processes characterized by ___________ rates or extended times at an elevated temperature to create a homogeneous structure or approximate an equilibrium condition Process Objectives: ___________________________ _______________________ ___________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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©2003 Bil Young 4 Equilibrium Phase Diagrams Graphic mapping of the ________________ of a material Indicate temperatures that must be attained to produce a starting structure, and changes that will occur upon cooling Define the material structure based on equilibrium temperature and composition (alloy or carbon) ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bil Young 5 Simplified Iron-Carbon Phase Diagram for Steels Fig 5-1 Page 83 Steels ←→ Cast Irons 2.11 % Hypoeutectoid Hypereutectoid Eutectoid ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ©2003 Bil Young 6 Grain Size Grain size plays an important role in a materials properties Course Grain Steels Less toughness, more distortion, better machinability and hardenability Fine Grain Steels Tougher, more ductile, less distortion, crack resistant Grain Size Control – Achieved by composition or heat treatment ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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©2003 Bil Young 7 Processing Heat Treatments for Steel (Ferrous Metals)
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Chapter5ba - _ Materials & Processes in Manufacturing...

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