Chemical Engineering Basics
Sub zero treatment of steel is done to

Suppress martensite transformation
Reduce the retained austenite in hardened steel
Enhance its working performance in sub zero atmosphere
Induce temper brittleness after its hardening

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Chemical Engineering Basics
Which of the following is not a characteristic observed in material failure by fatigue fracture ?

Initation of crack occurs on the surface of the machine part
Initiation of crack from below the surface does not occur
Plastic deformation of material does not occur
Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

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