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Correct Answer : Option (C) : optical microscope
Explanation : Microstructures are examined by optical microscopy, by scanning electron microscopy and by transmission electron microscopy. Ultrasonic imaging is used for detecting defects in a component. The acoustic waves penetrate the material, enabling one to study the microstructure of material within the volume, to detect small defects, to study adhesive interfaces, and also to gain information about elasticity as well as absorption.
Correct Answer : 88% tin, 4% copper and 8% antimony
Correct Answer : Coarse pearlite
Explanation : Hypoeutectoid steels are heated above the A3 line and then cooled in the furnace. Then it removed from the furnace and then cooled at room temperature. This results in coarse pearlite with excess ferrite.
Correct Answer : is more ductile and has a less tendency to distort during heat treatment
