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Mechanism of Strengthening in Metals

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Damian Żelechowski

on 21 May 2015

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Transcript of Mechanism of Strengthening in Metals

associated with the dispersion hardening procedures, or toughening.
due to crumple
cold working by strengthening
strengthening metallurgical factors
(grain size, the composition of the solid solution)
strengthening heat treatment
solutions strengthening
It consists in putting into the crystal lattice foreign atoms which diameters are different than the one in crystal lattice
martensitic strengthening
Martensitic transformation surgery performed by heat treatment - hardening.
strengthening resulting from the grain size
The influence of grain size on yield strength:
dispersion strengthening
the formation of dislocation loops around the small precipitates
Strengthening strain
It is based on mutual blockage of moving dislocations in different slip planes.
Main kinds of strengthening of metals:
specific kinds of strengthening:
Mechanism of Strengthening in Metals
Military University of Technology
Department og Advanced Materials and Technology

Damian Żelechowski

cold working, heat or thermo-plastic, which turns the metal structure having such mechanical properties change as the increase in hardness and tensile strength, yield strength increase, decrease toughness and ductility.
Strengthening produce atomic-scale phenomena, rise and movement of dislocations in the crystal lattice, for example. Stopping their movement at the grain boundaries or in other places focus lattice defects.
The differences between strengthening metal and non strengthening one:
Increased mechanical properties:
-yield strength; Re
-tensile strength; Rm
-hardness; H
reduced plastic properties:
-elongation; A
-necking; Z
-toughness; KC
From mechanical properties, electrical conductivity decreases
associated with the casting process and mainly the deoxidation and modification.
The stresses thus introduced into the lattice causes additional resistance of movement of dislocations.
-Re - yield strength;
-A,K - materials coefficients;
-d - grain size
Strengthening the influence of the grain boundaries is very strong in metals A3 network. In the structures of the regular impact it is much weaker because of the greater amount of dislocation slip planes.
The grain size can be adjusted during the casting process and plastic working.
Strengthening martensitic is the result of strong internal stresses lattice of martensite, caused by surfeit Feα with carbon atoms.
1. Dislocation approaches the obstacle.
2. Dislocation affects the obstacle. The first stadium
3. Dislocation affects the obstacle. The critical stadium
4. Dislocation affects the obstacle. The last stadium. Creating loops around the obstacles
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