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MATSE 259 Final Questions And Answers
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MATSE 259 Final Questions And Answers
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Solution 2024/2025Pepper
MATSE 259 Final Questions And Answers
Ferrous alloys ANS✔✔ Those where iron is the prime constituent. Susceptible to corrosion.
Steels ANS✔✔ Iron-carbon alloys that may contain appreciable concentrations of other alloying elements.
Plain carbon steels ANS✔✔ Steels in which carbon is the prime alloying element.
Plain low carbon steels
(a) wt % C
(b) heat treatment
(c) how are they strengthened?
(d) microstructure
(e) properties
(f) uses ANS✔✔ (a) < 0.25 wt% C
(b) These materials are unresponsive to heat treatments intended to form martensite.
(c) Strengthening is achieved by cold work.
(d) Microstructures consist of ferrite and pearlite.
(e) These alloys are soft and weak but are VERY ductile and tough. They are machinable, weldable, and inexpensive.
(f) They are typically used in automobile body components, sheet steel, low temperature pressure vessels, and
structural steel.
, Solution 2024/2025
Pepper
HSLA (high-strength, low alloy) steels (low carbon steel)
(a) composition
(b) strength
(c) heat treatment
(d) properties
(e) corrosion resistance
(f) uses ANS✔✔ (a) Contain copper, vanadium, nickel, and molybdenum.
(b) Are stronger than plain low carbon steels.
(c) May be strengthened by heat treatment.
(d) They are ductile, formable, and machinable.
(e) They are more resistant to corrosion than plain carbon steels.
(f) They are used in bridges, towers, and pressure vessels
Plain and heat treatable medium carbon steels
(a) wt % C
(b) microstructure
(c) properties of plain steel
(d) how to make them heat treatable
(e) properties of alloyed heat treatable steel
, Solution 2024/2025
Pepper
(f) uses of heat treatable steel ANS✔✔ (a) 0.25-0.60 wt % C
(b) Often used with tempered martensite microstructures.
(c) Plain steels have low hardenability and can only be heat treated in thin sections with rapid quenching rates.
(d) Adding chromium, nickel, and molybdenum improve the capacity to be heat treated.
(e) Heat treated steel is stronger and harder than low/medium carbon steel, but is less tough and ductile.
(f0 Applications include railway wheels and tracks, gears, crankshafts, bolts, hammers, blades, hand tools, and pistons.
Anything that needs high strength, wear resistance, and toughness.
Plain high carbon steels
(a) wt % C
(b) properties
(c) heat treatment ANS✔✔ (a) 0.6 - 1.4 wt % C
(b) Hardest, strongest, and least ductile of carbon steels. Very wear resistant.
(c) Almost always used in a hardened and tempered condition.
Tool high carbon steels
(a) composition
(b) properties
(c) uses ANS✔✔ (a) Tool and die steels contain chromium, vanadium, tungsten, and molybdenum.
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