Hardening

Defines the quality of a product in terms of microstructure, mechanical properties, residual stress and dimensional accuracy.
hardening
Heat treating alters the physical properties of metal materials to improve hardness, toughness, ductility, and mechanical properties.

What is Hardening used for?

Hardening and tempering develops the optimum combination of hardness, strength and toughness in engineering steel and offers the component designer a route to savings in weight and material.

Components can be machined or formed in a soft state and then hardened and tempered to a high level of mechanical properties.

Neutral clean hardening is carried out under tightly-controlled conditions to produce a precision component needing the minimum of final finishing. This process applies to components that require surface integrity to be maintained; examples include nuts, bolts, springs, bearings and many automotive parts.

What metals can be hardening?

Most heat treatment processes utilize both extreme heat and extreme cold to alter the crystalline microstructure of the material and achieve the desired result.

Almost all engineering steels containing over 0.3% carbon will respond to hardening and tempering. If a metal does not contain the necessary quantity of carbon, then its crystalline structure cannot be broken, and therefore the physical makeup of the steel cannot be altered.
Hardening in details

Practical uses of hardening

Overview

Heat treating can affect a number of different aspects of the metal including strength, hardness, toughness, machinability, formability, ductility, and elasticity. The importance of heat treatment is evident in many precision machined parts in the automotive, aerospace, hydraulic, medical and consumer goods industries, all using heat treatment to improve the properties of materials. There are 5 common types of hardening process on precision machined parts, Hardening, Case hardening, Annealing, Normalizing and Tempering.

Hardening

In heat treating to harden a metal, the metal is heated to a temperature where the elements in the metal become a solution. Before doing this, defects in the crystal lattice structure of metal are the primary source of ‘give’ or plasticity. Heat treating addresses those deficiencies by bringing the metal into a reliable solution with fine particles to strengthen the metal. Once the metal is thoroughly heated to the right temperature to produce a solid solution, it is quickly quenched to trap the particles in solution.
In precipitation hardening, impurity particles are added to the metal alloy to increase strength further.

Case hardening

In the process of case hardening, the external layer of metal is hardened while the interior metal remains soft. For metals with a low carbon content such as iron and steel, additional carbon has to be infused into the surface. Case hardening is a process often used as a final step after the piece has already been machined. High heat is used in combination with other elements and chemicals to produce a hardened outer layer. Because hardening can make metals more brittle, case hardening can be useful for applications that require a flexible metal with a durable wear layer.

Annealing

Annealing is a heat treatment method where a metal such as aluminum, copper, steel, silver, or brass is heated to a specific temperature, held at that temperature for some time to allow transformation to occur, and then air cooled. This process increases the metal’s ductility and decreases hardness to make the metal more workable. Copper, silver, and brass can be cooled quickly or slowly, whereas ferrous metals like steel must always be cooled gradually to allow annealing to occur. Annealing may be used before a metal is machined to improve its stability, making harder materials less likely to crack or fracture.

Normalizing

Normalizing is an annealing process for steel where it is heated 150-200°F higher than in annealing and held at the critical temperature long enough for the transformation to occur. Steel treated in this way must be air cooled. The heat treating in normalization causes smaller austenitic grains, while air cooling produces more refined ferritic grains. This process improves machinability, ductility, and strength of the steel. Standardization is also useful to remove columnar grains and dendritic segregation that can occur during the casting of a part.

Tempering

Tempering is a method of heat treating used to increase the resilience of iron-based alloys like steel. Iron-based metals are very hard, but they are often too brittle to be useful for most purposes. Tempering can be used to change the hardness, ductility, and strength of metal, which usually makes it easier to machine. The metal will be heated to a temperature below the critical point as lower temperatures reduce brittleness while maintaining hardness. For increased plasticity with less hardness and strength, higher temperatures are required.

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