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Five common heat treatment processes

cFive common heat treatment process performance introduction heat treatment process has the characteristic of diversity, an not use the single performance index to evaluate the difficulty degree that the material or the part obtains the anticipated heat treatment effect in the heat treatment process. The common heat treatment process performance includes hardenability, susceptibility to quenching, sensitivity to decarburization, tempering brittleness, etc. Hardenability means the depth to which the entire section of the steel is hardened during quenching. The most commonly used standard test method of hardenability is end quenching test. When this method is adopted, the heat treatment process of specimens of specified size is characterized by diversity, and it is impossible to use a single performance index to evaluate the difficulty degree of obtaining expected heat treatment effect of materials or parts in the heat treatment process. The common heat treatment process performance includes hardenability, susceptibility to quenching, sensitivity to decarburization, tempering brittleness, etc.


Five common heat treatment processes


Hardenability means the depth to which the entire section of the steel is hardened during quenching. The most commonly used standard test method of hardenability is end quenching test. When this method is adopted, the specimens of specified size may be heated to quench temperature. The specimens may then be cooled by spray water at one end of the testing machine. After being completely cooled, the surface hardness distribution along the entire height of the specimens may be measured.

Grain growth tendency, also known as superheat sensitivity, refers to the size of metal grain coarsening tendency during heating. The grain size of metal is measured at different temperatures.

Tendency of cracking of sensitive metal during quenching. There is no uniform standard method for assessing the extent of cracks in specimens of a certain shape after quenching with a quenching medium with different cooling capacities.

The tendency of carbon emission and oxidation of the surface layer of decarburized sensitive steel during heating and heat preservation. In general, the depth of decarburized layer is determined by means of metallographic method or stripping method after the sample is kept in the corresponding heating environment for a certain period of time. This is a very important index for the steel used for bearings, tools, moulds, springs, etc.

Temper brittleness tendency of hardened steel in 400 ~ 600 ℃ temperature range when temper embrittlement phenomenon, also known as reversible temper brittleness. Generally, the impact toughness ratio of steel in the state of slow cooling and water cooling after tempering is used to measure the impact toughness ratio.

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