An industrial alloy is manufactured by diffusing a small percentage of carbon atoms…
CHEMISTRY · Multi-part · AP · Chemistry · Compound Structure and Properties · Compound Structure and Properties
Problem
An industrial alloy is manufactured by diffusing a small percentage of carbon atoms into the interstices of an iron lattice, producing a material commonly referred to as steel. Prior to carbon addition, pure iron exhibits high malleability, ductility, and electrical conductivity.
(a) Describe qualitatively how the presence of interstitial carbon atoms alters the mechanical properties (malleability and hardness) of the iron lattice. Support your answer with particulate-level reasoning.
(b) Predict and justify the effect of carbon addition on the electrical conductivity of the alloy compared with pure iron at room temperature.
(c) Suppose a thin rod of the alloy is subjected to rapid heating. Discuss how both the metallic bonding model and the altered lattice structure help explain the observed thermal conductivity of the rod relative to that of pure iron.
(d) Engineers require a structural material that can sustain repeated mechanical stress at elevated temperatures. Evaluate whether the described alloy or pure iron is the better choice, citing evidence from your answers to parts (a)–(c).