Dr. Eng. Hamed A. Nagy HAZ and Heat Input. Dr. Eng. Hamed A. Nagy Basic Metal Structures I. Pure Metal II. Substitutional Atom III. Interstitial Atom.

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Presentation transcript:

Dr. Eng. Hamed A. Nagy HAZ and Heat Input

Dr. Eng. Hamed A. Nagy Basic Metal Structures I. Pure Metal II. Substitutional Atom III. Interstitial Atom

Dr. Eng. Hamed A. Nagy Basic Metal Structures I. Simple Cubic II. Body Centered Cubic (BCC) III. Face Centered Cubic (FCC) Al, Cu, Ni Fe, Cr

Dr. Eng. Hamed A. Nagy Iron-Carbon Diagram % C Temperature

Dr. Eng. Hamed A. Nagy Mechanical Mixtures Coarse Pearlite Slow Cooling High Ductility Low Strength Fine Pearlite Moderate Cooling Moderate Ductility Moderate Strength Bainite Rapid Cooling Low Ductility High Strength Lamellar

Dr. Eng. Hamed A. Nagy Martensite Very Rapid Cooling Martensite Carbon has no chance to diffuse Metastable Phase Acicular (Needle) Structure Lowest Ductility Highest Strength Body Centered Tetragonal BCT

Dr. Eng. Hamed A. Nagy Tempered Martensite Heating from Martensite Carbon gets able to diffuse Some relaxation. Restore ductility Keep strength at moderate levels

Dr. Eng. Hamed A. Nagy HT Time Temperature Annealing Normalizing Oil Quenching Water Quenching

Dr. Eng. Hamed A. Nagy HT Temperature Tempering Time

Dr. Eng. Hamed A. Nagy Solidification Coarse Grain Size Fine Grain Size Liquid

Dr. Eng. Hamed A. Nagy Solidification Dendrites

Dr. Eng. Hamed A. Nagy Welding Zones % C Temperature

Dr. Eng. Hamed A. Nagy Welding Zones Temperature

Dr. Eng. Hamed A. Nagy Welding Zones Temperature Preheat HAZ Temp.

Dr. Eng. Hamed A. Nagy Welding Zones Two factors can control the rate of cooling: 1- Heat Input a)Power b)Traveling Speed 2- Preheat

Dr. Eng. Hamed A. Nagy Welding Zones Three factors can not be controlled: 1- Carbon Equivalent 2- Thickness 3- Thermal Conductivity.

Dr. Eng. Hamed A. Nagy HAZ

Dr. Eng. Hamed A. Nagy HAZ and Heat Input

Dr. Eng. Hamed A. Nagy HAZ and Heat Input

Dr. Eng. Hamed A. Nagy HAZ and Heat Input

Dr. Eng. Hamed A. Nagy LBZ

Dr. Eng. Hamed A. Nagy HAZ (Grain Growth Diagram)

Dr. Eng. Hamed A. Nagy Distortion and Residual Stresses Without Clamping

Dr. Eng. Hamed A. Nagy Distortion and Residual Stresses Strain Stress

Dr. Eng. Hamed A. Nagy Distortion and Residual Stresses Strain Stress

Dr. Eng. Hamed A. Nagy Distortion and Residual Stresses Strain Stress