Annealing, quenching and heat treatment spring and spring steel
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Principles of prescribing modes of heat treatment of spring steels
To perform its operating functions control elements of springs must have:
Sufficient ductility during processing;
Resistance against alternating loads.
The provision of such complex properties is only possible after the correct prescription of treatment. Considering that all steel of this group belong to high carbon and have sorbitol/troostite structure, the mode of heat treatment should not result in internal stresses and to prevent spontaneous aging products under load (to prevent creep).
For example, alloy spring steel grades 55S2 and 60S2 for more high indices of elasticity, toughness and hardenability — are composed of a higher percentage of silicon, which result in hardening with following tempering dissolves completely in iron without forming with them any of the compounds.
The initial state of these steels, the ferrite mixed with carbides. The first component determines the ductility of the spring steels, and the second is fragility. To give the beds in the structure of the equilibrium, it is quickly heated to temperatures above the formation of solid solution of carbon in α-iron (700…7200 C), and then moderately quickly cooled in oil so as not to create internal structural stresses. It was under such conditions of the heat treatment the steel receives the equilibrium crystal structure. Additionally it can be improved by annealing, but falls original hardness, which in turn will reduce the durability of the part.
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Operational properties of spring steels after the heat treatment at the optimum regimes
GOST 14959−89 establishes the following level of performance spring steel:
|Steel grade||Yield strength, N/mm2||Tensile strength, N/mm2||Relative elongation δ5, %||The relative narrowing, %|
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