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MATSE Lesson 9 With Complete Solutions
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MATSE Lesson 9 With Complete Solutions
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Solution 2024/2025Pepper
MATSE Lesson 9 With Complete Solutions
Plain Carbon Steels ANS✔✔ Steels in which carbon is the prime alloying element
Alloy Steels ANS✔✔ A steel that is alloyed with a variety of elements. In general more heat treatable
Low Carbon Steels ANS✔✔ Lighter grains, most defined grain boundaries. 0.05 wt% C. typically unresponsive to
martensitic heat treatments. Microstructure consists of ferrite and pearlite constituents, making them
relatively soft and weak but with good ductility and toughness.
They are machinable, weldable, and least expensive of the various steels to
produce.
High Strength Low Alloy Steels ANS✔✔ Low carbon, contains some alloys that allow for heat treatability, enhanced
corrosion resistance relative to plain carbon
Medium Carbon Steels ANS✔✔ can be heat treated by austentizing, quenching,
and tempering to improve mechanical properties.
Plain medium carbon steels typically have low hardenabilities and can
only be heat treated in very thin sections with rapid quenching rates.
Additions of Cr, Ni, and Mo improve capacity of the alloys to be heat
treated.
Heat treated alloys are stronger than low carbon steels at the sacrifice
of ductility and toughness.
High Carbon Steels ANS✔✔ High carbon steels are the hardest, strongest, and least ductile of the
carbon steels.
Almost always used in a hardened and tempered condition
, Solution 2024/2025
Pepper
They are especially wear resistant and capable of holding a sharp
edge.
Tool Steels ANS✔✔ class of high carbon steels that contain Cr, V, W, and Mo. These alloying elements combine with
carbon to form very hard and wear
resistant carbides
Steels ANS✔✔ Represented by the Iron-IronC arbide System
Cast Irons ANS✔✔ Based on the Fe-C Phase Diagram
Cast Irons ANS✔✔ Cast irons typically have carbon concentrations between 3.0 and 4.5 wt.%
with other alloying element additions.
Tendency to form graphite is regulated by the composition and cooling rate.
Graphite formation is promoted by the presence of silicon in concentrations
greater than 1 wt.%.
Slower cooling rates during solidification favor graphitization (formation of
graphite).
Both microstructure and mechanical behavior depend on composition and
heat treatment.
Gray Cast Iron ANS✔✔ A cast iron alloyed with silicon in which the graphite exists in the form of flakes. A fractured
surface appears gray. Brittle/weak in tension, used extensively due to vibration dampening characteristics, high
resistance to wear
Ductile/Nodular Cast Iron ANS✔✔ Graphite forms nodules or spheres surrounded by pearlite. Stronger and more ductile
than grey iron. Mechanical properties approach that of steel.
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