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|contributor.author||Maity, K P||-|
|identifier.citation||26th International Conference on surface modification technologies, june 20th -22nd 2012, Ecole Centrale de Lyon Ecully France||en|
|description||Copyright belongs to proceeding publisher||en|
|description.abstract||Cryogenic treatment is one time permanent treatment that affects the entire section or bulk of
the component unlike coatings. The cryogenic treatment is an add on process over
conventional heat treatment in which the samples are cooled down to prescribed cryogenic
temperature for a long time and then heated back to room temperature. The process is not a
substitute for heat treatment but rather an extension of the heating/quenching/tempering
cycle. In most instances the cryogenic cycle is followed by a heat tempering procedure.
Two major changes in micro-structure of steel occur as a result of cryogenic treatment[2,3],
which play the principal role for dramatic improvement in wear resistance. The retained
austenite are transformed to wear resistant martensite to achieve more uniform hardness. Fine
carbide precipitates are formed during the long cryogenic soak. These fine particles along
with large particles form a denser, more coherent and much tougher matrix in the material.
Yun et al. verified the changes in the microstructure of M2 high speed steel when the
materials was submitted to different cycles of cryogenic treatment at -196 degree Celsius.
Dong et al. investigated in detail an effect of varying the deep freezing and tempering
cycles on high speed steels and concluded that improvement of wear resistance in tool steels
because of elimination of retained austenite and initiation of nucleation site for precipitation
for large number of very fine carbide particles. Empirical investigations have demonstrated
that the tool life of cutting tools like high speed steel and tungsten carbide can be enhanced
by cryogenic treatment||en|
|title||Enhancement of micro-drilling performance by cryogenic treatment of drill bit||en|
|Appears in Collections:||Conference Papers|
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