Conventional Heat Treatment & Tempering:
Heat treated parts go through extreme amounts of stress inducing phases. Consider taking a bar of steel that has been heated to 1472°F for an extended period so the temperature is even throughout the metal then, plunging that steel into water that is 68°F. the rapid cooling reduces the surface temperature almost instantaneously while the interior of the structured metal is still red hot. Although, the heat does dissipate, it does not dissipate uniformly. Therefore, the radical cooling of the outer core and inner core in a non-uniform way causes compression stresses which, need to be stabilized.
The part now needs to be tempered to stabilize the newly formed martensite. If this is not completed, the inherent stresses are arranged to cause the part to crack or explode. Because such high temperatures are needed to relieve stress, more austenite grain structures are transformed from martensite, creating yet, another stress layer.
The best and most complete way to remove built up stresses from heat treating and manufacturing is through the use of cryogenic temperatures Metal Treatment. a properly performed deep cryogenic treatment will ensure stress relief. This process will never change the color of the metal in any way, as it will change with standard heat treatment.
CryoHeat Metal Treatment performs cryogenic processing by simply allowing the molecules to realign in a uniform like fashion. This releases any stored energy that may be trapped in the object. this in turn increases strength and toughness within the object as it relaxes back to its proper positioning. the molecules are now working in an orderly and uniform fashion with one another. there is also changes happening on the surface of the material. the gaps along the surface are reduced and arranged in a more uniform state, tightening the lattice sphere.
Deep cryogenic treatment performed in a controlled environment with a CryoHeat processor and special proprietary formulas is a very viable stress reliever and can be used where heat cannot. the CryoHeat process will never change the color of the metal in any way, as it will change with a heat treatment. It can be used prior to, during or after machining materials. It is a through stress reliever all the way through and not just an exterior stress relief as with the case with shot and laser peening and many other ways that not only work on the surface until it wears out and still has insufficient material below. During the CryoHeat process, there is also a precipitation of fine extra carbides throughout the metal, this is in addition to the larger carbides already present in the ferrous metals. these fine carbides increase the bond within the molecular structure of the metals which, in turn, increase wear resistance again.
For further information and cost break down on this process Email @ Spearsracing1@gmail.com or Call 209-923-4684
Heat Treatment & Cryogenics
Descriptions of stress with your parts:
During the process of manufacturing, production and the machining phases on a molecular level materials are subject to strenuous events. These events cause molecular displacement or gaps in the matrix during the solidification stages. these gaps are out of place molecules which, are not working in uniform with one another but, are displaced and can be working against each other. This causes a lack of strength and durability placing a great amount of stress on the newly formed objects.
Textural Stress - Arises due to microscopic inhomogeneties in a metal.
Body stress - Stress created or produced by an external load and contingent body stress when the load is removed.
Residual Stress - The remains after a load is removed and clearly seen as the retention of stress cracks. It is impossible to cold work steel without creating stresses on the metal. Most common major stress is caused in machining or altering the parts by any form of metal removal. Grinding can produce temperatures in excess of 1650°F. This produces great amount of surface stress.