- Chemical Engineering Basics - Section 1
- Chemical Engineering Basics - Section 2
- Chemical Engineering Basics - Section 3
- Chemical Engineering Basics - Section 4
- Chemical Engineering Basics - Section 5
- Chemical Engineering Basics - Section 6
- Chemical Engineering Basics - Section 7
- Chemical Engineering Basics - Section 8
- Chemical Engineering Basics - Section 9
- Chemical Engineering Basics - Section 10
- Chemical Engineering Basics - Section 11
- Chemical Engineering Basics - Section 12
- Chemical Engineering Basics - Section 13
- Chemical Engineering Basics - Section 14
- Chemical Engineering Basics - Section 15
- Chemical Engineering Basics - Section 16
- Chemical Engineering Basics - Section 17
- Chemical Engineering Basics - Section 18
- Chemical Engineering Basics - Section 19
- Chemical Engineering Basics - Section 20
- Chemical Engineering Basics - Section 21
- Chemical Engineering Basics - Section 22
- Chemical Engineering Basics - Section 23
- Chemical Engineering Basics - Section 24
- Chemical Engineering Basics - Section 25
- Chemical Engineering Basics - Section 26
- Chemical Engineering Basics - Section 27
- Chemical Engineering Basics - Section 28


Chemical Engineering Basics - Engineering
Q1: The hardenability of steel decreases withA decrease in dislocation density.
B increase in solutionising temperature.
C increase in strength.
D decrease in grain size.
ANS:D - decrease in grain size. Decreasing the grain size of steel can actually increase its hardenability. Grain size refers to the size of the individual crystalline grains in the microstructure of the steel. In metallurgy, finer grain sizes are generally associated with improved mechanical properties, including higher strength, toughness, and hardness. When steel is quenched (rapidly cooled), the transformation of austenite (the high-temperature phase) into martensite (the hardened phase) occurs more rapidly at the grain boundaries. Therefore, smaller grain sizes mean more grain boundaries, providing more sites for the nucleation of martensite during quenching. This results in a greater depth of hardening and increased hardness throughout the material. In summary, decreasing the grain size of steel can enhance its hardenability, allowing it to achieve greater hardness and depth of hardening during heat treatment processes like quenching. |


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