Compared to low carbon steels, high carbon steels have (A) higher ductility, hig

Question

Compared to low carbon steels, high carbon steels have (A) higher ductility, higher yield strength, (B) higher ductility, lower yield strength, (C) lower ductility, higher yield strength, (D) lower ductility, lower yield strength, (2) If the ionic radii are 0.100 nm and 0.140 nm for Ca^2+ and O^2-, please use the following table to predict the coordination number of CaO. Please use the same table to predict the crystal structure of CaO. (A) Rock salt (NaCI) structure (B) Fluontc (CaF_2) structure. (C) Caesium chloride (CsCI) structure (D) Zinc blende (ZnS) structure.

Explanation / Answer

(1) High carbon steels have low ductility and high yield strength

(2) r cation = 0.100 nm

r anion = 0.140 nm

r cation / r anion = 0.1 /0.14 = 0.7142

From table coordination number is 6

so correct option is (C)

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