Material Science Exam 3 Review

• Exam 3 covers Chapters 6 (section 6.5), 16, 17, and 19 of the 9th edition textbook.
• Review chapter summaries, glossaries, and important terms.
• A blank Fe-Fe3C diagram is provided for reference.

Corrosion (Chapter 6)

• Cathodic protection examples help prevent or reduce corrosion.
• Design changes, material selection, and environmental control are crucial steps in corrosion control.
• Cathodic protection is a technique to prevent corrosion.
• Anodic protection is a technique to prevent corrosion.
• A sacrificial anode protects against corrosion.
• Galvanizing involves coating with zinc to protect against corrosion.
• Cladding is a protective layer, differing from coating.

Stainless Steels (Chapter 16)

• Ferritic stainless steels are magnetic, may/may not be weldable, BCC, non-heat treatable, with specific carbon and chromium contents.
• Martensitic stainless steels are types of stainless steel.
• Austenitic stainless steels are non-magnetic, FCC, and have specific carbon and chromium contents.
• Sigma phase formation is not desirable.
• Physical and mechanical properties vary among stainless steels.
• Sensitization is a process with time/temperature dependence, preventable by controlling carbon content.
• Stabilized stainless steels contain specific alloying elements.
• Stainless steels are susceptible to stress corrosion cracking.
• Different stainless steels have various applications based on their properties.
• Corrosion properties and conditions differ among stainless steels.
• Ferritic, martensitic, and austenitic stainless steel attributes are in Figure 16-15 and lecture notes.
• The numbering system identifies stainless steel types.
• Different stainless steels are suitable for specific applications and corrosive environments based on their characteristics.

Cast Irons (Chapter 17)

• Different cast irons vary in chemistry, properties, machinability, weldability, and applications.
• Understanding solidification mechanisms and how they affect mechanical properties is important.
• Good vs. bad casting designs are illustrated in Figures 17-9 and 17-10.
• Gray cast iron numbering system relates to carbon content and mechanical properties.
• Flake size and distribution in gray cast iron affect its properties and microstructure.
• Malleable cast iron manufacturing affects its mechanical properties, numbering system, and microstructure.
• Ductile (nodular) cast iron is made using specific chemicals, and has distinct physical properties, numbering system, and microstructure.
• White cast iron has unique properties and microstructure.
• Cast steels' modulus and impact strength differs from cast irons.
• Casting choices in section 17.8 depend on application requirements.

Aluminum (Chapter 19)

• Physical properties compared to other materials, including Modulus of Elasticity, conductivity, coefficient of thermal expansion.
• Aluminum characteristics are outlined in section 19.1.
• The numbering system provides information including alloy series and alloying elements.
• Suffixes like -H1 indicate temper.
• The T suffix generally indicates heat treatment.
• Aluminum alloys are either heat-treatable or non-heat-treatable.
• Precipitation hardening includes solid solution heat treating, water quench, and natural or artificial aging.
• Alloying elements Fe, Mn, Si, Mg, Zn, and Cu affect aluminum's properties.
• Anodizing is a surface treatment altering color, with variations like conventional, clear, and hard coating.
• Corrosion resistance varies among aluminum series, e.g., resistance to pitting or susceptibility to stress corrosion cracking.
• Aluminum's stiffness compared to steel is essential for comparison.
• Aluminum's weldability and formability are significant characteristics.
• Each alloy group possesses distinct attributes.
• Aluminum's machinability depends on the alloy composition.
• Corrosion properties and conditions vary among aluminum alloys.