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Engineering Materials

Engineering Materials
Hardness of lower bainite (tempered martensite) is about

RC 57
RC 48
RC 65
RC 80

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Engineering Materials
Sulphur in steel

Lowers the toughness and transverse ductility
Acts as deoxidiser
Reduces the grain size
Decreases tensile strength and hardness

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Engineering Materials
The defect which takes place due to imperfect packing of atoms during crystallization is known as

Surface defect
None of these
Line defect
Point defect

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Engineering Materials
A reversible change in the atomic structure of steel with corresponding change in the properties is known as

Solidus change
Molecular change
Allotropic change
Physical change

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Engineering Materials
Induction hardening is basically a

Surface hardening process
None of these
Carburising process
Core hardening process

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Engineering Materials
A reversible change in the atomic structure of the steel with a corresponding change in the properties is known as

Recrystallization
Heat treatment
Precipitation
Allotropic change

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