ISYE 415 Exam 1 Verified Questions And Answers.

Material Properties - correct answer Ways to describe the behavior of material in response to physical forced Metal properties - correct answer crystalline structures Strong, hard, and ductile High electrical and thermal conductivity Opaque and reflective Cast metal - correct answer initial form is a casting Wrought Metal - correct answer Metal that has been worked or can be worked Alloy - correct answer Metal composed of 2 more elements Heat Treatment - correct answer manipulate mechanical properties of metals Age Hardening - correct answer Raw material: any metal Process: heat then quench (oil or water bath) and then cool around temp for days About 50% more strength with no affect on ductility Quench Hardening - correct answer Raw Material: ferrous materials Process: heat then quench and cool rapidly Material turns hard but also brittle Surface Hardening - correct answer Raw material: medium to high carbon steel Heat by induction (electromagnetic field) then quenched Results in hard surface, but material inside unaffected Annealing - correct answer Process: heat to above 50% of melting point, hold at the temp, and then cool slowly Purpose: remove dislocations and generate grain growth Erases effects of cold working Recrystallize cold worked metals Relieve residual stresses Dislocations - correct answer gaps in crystalline structure tensile strength - correct answer The pulling stress a material can withstand without tearing. Stress relief - correct answer Done after cold working and at a low temp of 300 to 500° Relieves dislocations and entanglements Adds toughness and ductility Effect of temperature - correct answer Tensile strength decreases Yield strength decreases Ductility increases Pinning - correct answer when the dislocations are stuck in a certain place Plastic deformation - correct answer permanent deformation caused by strain when stress exceeds a certain value Precipitates - correct answer small atoms or molecules that fit within vacant spaces of metal atoms yield strength - correct answer the point at which a material begins to deform permanently elastic deformation - correct answer region where the material will return to its original shape when the stress is removed Hardness - correct answer resistance to permanent indentation surface roughness - correct answer finely spaced deviations from the nominal surface Waviness - correct answer large deviations from the nominal surface Lay - correct answer predominant direction or pattern of the surface Oxide film - correct answer what happens to the surface when exposed to oxygen Ex 1: aluminum gets a film to protect from corrosion Ex 2: rust forms on the surface of iron and steel and corrodes the metal Heat treatment before manufacturing - correct answer to make metal easier to form Heat treatment between manufacturing processes - correct answer relieve the effects of strain hardening and prepare it for further deformation Heat treatment after manufacturing process - correct answer achieve desired strength and hardness Cold working - correct answer Performed at room temperature or slightly above cold working advantages - correct