Topic: Material Science
Which of the following properties of material that cannot be significantly changed by heat treatment?
- A. Ultimate tensile strength
- B. Yield strength
- C. Elastic Modulus
- D. Ductility
Answer: C. Elastic Modulus
Explanation: Elastic modulus (Young's modulus) is an intrinsic property determined by the interatomic bonding forces of the material. While heat treatment heavily alters the microstructure (dislocations, grain size, phases) affecting yield strength, UTS, and ductility, it has virtually no significant effect on the elastic modulus.