Lecture 5b - Casting

Lecture 5b - Casting - Metal Metal-Casting Processes...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Metal Metal-Casting Processes Casting Processes Lecture 5.b ISE 2204 – Introduction to Manufacturing Processes Dr. Jaime Camelio February, 19 th 2009 Casting History Solidification Type of Processes Design Considerations Economics ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Outline Outline Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com 6000 years old The introduction of molten metal into a mold cavity, where, upon solidification, the metal takes the shape of the cavity Intricate shapes in a single piece Wide range of sizes Internal cavities All metals can be cast Near net shape Minor finishing required ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Casting Casting Solidification ◦ From the molten state ◦ Shrinkage Flow Into the mold cavity ◦ Into the mold cavity Heat transfer ◦ During solidification and cooling in the mold Mold material ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Important Factors Important Factors ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Solidification of Metals Solidification of Metals (a) Temperature as a function of time for the solidification of pure metals. Note that freezing takes place at a constant temperature. (b) Density as a function of time. The casting contracts as it cools Alloys solidify over a range of temperatures Solidification begins when the temperature of the molten metal drops below the liquidus and is completed when the temperature reaches the solidus solidus Within this range, the alloy is mushy ◦ Composition and state described by the alloy’s phase diagram ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Solidification Solidification Produced with a Trial Version of PDF Annotator - www.PDFAnnotator.com (a) Schematic illustration of grains, grain boundaries, and particles dispersed throughout the structure of a two-phase system, such as lead-copper alloy. The grains represent lead in solid solution of copper, and the particles are lead as a second phase. ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Two Two-Phased Alloys Phased Alloys (b) Schematic illustration of a two-phase system, consisting of two sets of grains: dark and light. Dark and light grains have their own compositions and properties. Graphically illustrates the relationships among temperature, composition, and the phases present in a particular alloy system Nickel-copper ISE 2204 – Introduction to Manufacturing Processes – Spring 2009 Phase Diagrams Phase Diagrams Note that pure nickel and pure copper each have one freezing or melting temperature....
View Full Document

This note was uploaded on 02/20/2010 for the course ISE 2204 taught by Professor Rhsturges during the Spring '08 term at Virginia Tech.

Page1 / 25

Lecture 5b - Casting - Metal Metal-Casting Processes...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online