MATSE 259 EXAM 4 REVIEW QUESTIONS WITH
100% ACCURATE ANSWERS
Coarse Pearlite - Accurate answers high diffusion allows Carbon atoms to diffuse over long
distances and form thick lamellae
Fine Pearlite - Accurate answers low diffusion allows Carbon atoms to diffuse over short distances
and form thin lamellae
Martensite - Accurate answers NOT diffusion driven
Independent of time
Stress Relief - Accurate answers component is heated to low temperature, held there then cooled
to room temperature by air
Normalizing - Accurate answers redefines grains to produce uniform size distribution
Cools to 900-950C
Severity of Quench - Accurate answers indicates rate of cooling
Water=most severe
Free machining - Accurate answers unweldable
Low Carbon steel - Accurate answers <.25 wt% C
*nonresponsive to heat treatments, but still machinable and weldable
*soft and weak
Applications: automobile bodies, structural shapes, tin cans, buildings, bridges
Medium Carbon steel - Accurate answers .25-.6 wt% C
*are heat treatable
*have a large combination of mechanical characteristics
Applications: railway tracks/wheels, machine parts, gears, crankshafts
High Carbon steel - Accurate answers .6-1.4 wt% C
*hard, strong, relatively brittle
Applications: chisels, hammers, knives, hacksaw blades
High alloy steels (stainless and tool) - Accurate answers *hard and wear resistant
*are widely resistant to corrosion
Applications: cutting tools, surgical tools, food processing equipment, drills, cutlery
White cast steel - Accurate answers hard and brittle
Intermediary in production of malleable cast iron
Virtually unmachinable
, Sigma - Accurate answers in stainless steels decreases corrosion resistance
Classes of Stainless Steel (based on Microstructure Constituents) - Accurate answers *ferritic
*austenitic
*martensitic
*duplex (combination of ferrite and austenite)
*precipitation hardening(heat treatable to form precipitates)
Ferritic Stainless Steel - Accurate answers *magnetic up to 750 degrees C
*NOT HEAT TREATABLE.. Hardened and strengthened by cold work
Austenitic Stainless Steel - Accurate answers *more corrosion resistant than ferritic
*also NOT HEAT TREATABLE, but is hardened and strengthened by cold work
Wrought Aluminium Alloy - Accurate answers 4 numbers
Lead number tells main alloy element
Temper designations
Aircraft uses
Cast Aluminium Alloy - Accurate answers 3 numbers
Temper designations same as wrought
Magnesium Alloy - Accurate answers *least dense of all structural metals
*hcp structure= bad properties
*relatively soft
*used in applications where weight is important ex: AEROSPACE
Copper alloys: brasses - Accurate answers copper-zinc : primary alloy
Copper alloys: bronzes - Accurate answers *stronger than brasses
*highly corrosion resistant
Titanium alloys - Accurate answers *have low density, high MP, unusually high corrosion resistance
Importance of nickel alloy and common uses - Accurate answers *has great corrosion and heat
resistance
*used as low-expansion, electrical resistance, soft magnetic, and shape memory alloy
2 types of nickel alloys - Accurate answers 1. Solid solution strengthening
*can only be hardened by cold-working
2. Age hardenable
Metal fabrication forming operation - Accurate answers extrusion
Drawing
Extrusion - Accurate answers PUSHING metal through die to change shape
Drawing - Accurate answers PULLING metal through die to get a new shape
100% ACCURATE ANSWERS
Coarse Pearlite - Accurate answers high diffusion allows Carbon atoms to diffuse over long
distances and form thick lamellae
Fine Pearlite - Accurate answers low diffusion allows Carbon atoms to diffuse over short distances
and form thin lamellae
Martensite - Accurate answers NOT diffusion driven
Independent of time
Stress Relief - Accurate answers component is heated to low temperature, held there then cooled
to room temperature by air
Normalizing - Accurate answers redefines grains to produce uniform size distribution
Cools to 900-950C
Severity of Quench - Accurate answers indicates rate of cooling
Water=most severe
Free machining - Accurate answers unweldable
Low Carbon steel - Accurate answers <.25 wt% C
*nonresponsive to heat treatments, but still machinable and weldable
*soft and weak
Applications: automobile bodies, structural shapes, tin cans, buildings, bridges
Medium Carbon steel - Accurate answers .25-.6 wt% C
*are heat treatable
*have a large combination of mechanical characteristics
Applications: railway tracks/wheels, machine parts, gears, crankshafts
High Carbon steel - Accurate answers .6-1.4 wt% C
*hard, strong, relatively brittle
Applications: chisels, hammers, knives, hacksaw blades
High alloy steels (stainless and tool) - Accurate answers *hard and wear resistant
*are widely resistant to corrosion
Applications: cutting tools, surgical tools, food processing equipment, drills, cutlery
White cast steel - Accurate answers hard and brittle
Intermediary in production of malleable cast iron
Virtually unmachinable
, Sigma - Accurate answers in stainless steels decreases corrosion resistance
Classes of Stainless Steel (based on Microstructure Constituents) - Accurate answers *ferritic
*austenitic
*martensitic
*duplex (combination of ferrite and austenite)
*precipitation hardening(heat treatable to form precipitates)
Ferritic Stainless Steel - Accurate answers *magnetic up to 750 degrees C
*NOT HEAT TREATABLE.. Hardened and strengthened by cold work
Austenitic Stainless Steel - Accurate answers *more corrosion resistant than ferritic
*also NOT HEAT TREATABLE, but is hardened and strengthened by cold work
Wrought Aluminium Alloy - Accurate answers 4 numbers
Lead number tells main alloy element
Temper designations
Aircraft uses
Cast Aluminium Alloy - Accurate answers 3 numbers
Temper designations same as wrought
Magnesium Alloy - Accurate answers *least dense of all structural metals
*hcp structure= bad properties
*relatively soft
*used in applications where weight is important ex: AEROSPACE
Copper alloys: brasses - Accurate answers copper-zinc : primary alloy
Copper alloys: bronzes - Accurate answers *stronger than brasses
*highly corrosion resistant
Titanium alloys - Accurate answers *have low density, high MP, unusually high corrosion resistance
Importance of nickel alloy and common uses - Accurate answers *has great corrosion and heat
resistance
*used as low-expansion, electrical resistance, soft magnetic, and shape memory alloy
2 types of nickel alloys - Accurate answers 1. Solid solution strengthening
*can only be hardened by cold-working
2. Age hardenable
Metal fabrication forming operation - Accurate answers extrusion
Drawing
Extrusion - Accurate answers PUSHING metal through die to change shape
Drawing - Accurate answers PULLING metal through die to get a new shape
