Hardness Resistance to indentation.

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Presentation transcript:

Hardness Resistance to indentation

Hardness Resistance to indentation Greater hardness gives higher hardness nos.

Types of hardness tests

Comparison of hardness scales

Example - quenched plain carbon steels

Correlation betwn strength & hardness Harder means stronger for metals & alloys

Toughness Resistance to being clobbered

Toughness Resistance to being clobbered Impact test measures energy absorbed upon fracture measure of toughness

Toughness Resistance to being clobbered

Impact test measure impact energy at different temperatures

Impact test measure impact energy at different temperatures

Impact test measure impact energy at different temperatures

Fracture toughness - Kic = Yc a resistance to brittle fracture in presence of a crack - resistance to crack propagation under load common specimen configuration usually pre-cracked here before testing

Creep deformation under small loads at elevated temps.