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Why DCT?

With DCT you can improve the wear resistance, reduce inner material stresses, increase the precision of the components, increase the HCF and improve thermal and electrical conductivity.

In detail

Improvement of wear resistance

  • By creating and finer distribution of so called eta carbides.
  • By transforming retained austenite into martensite.

Reduce inner material stresses

  • When producing the components and tools there are thermal and mechanical processes necessary, causing in the material stresses. These material stresses can be reduces and nearly deleted with the DCT.

Achieve maximum precision

  • Retained austenite is more or less unstable. Over time it will transfer to Martensite –> which will cause dimensional changes.
  • Material stresses will be decreased when DCT treated before the final machining.

Increase of high cycle fatigue

  • We could see the effect especially on spring steel. The high cycle fatigue (HCF) could be improved by 13% compared to non treated samples. Our multistage process achieved the best results.

Increase of thermal and electrical conductivity

  • Especially seen on CuCrX-alloys

The increase in wear resistance is the most wanted effect with DCT. For cutting and machining tools, punching- pressing and forming dyes, for high quality kitchen knives and tools and components which have abrasive wear (e.a.: breaking discs, gears, engine components, etc).

 

In detail:

Responsible for the increased wear resistance in tool steel is the transformation of retained austenite into martensite but even more the formation of so called eta carbides, which disperse within the grain structures extremely fine and uniform.

During manufacturing the tools and components thermal and/or mechanical processes are necessary, which causes inner material stresses. These stresses can be reduced with DCT.

In detail:

Inner material stresses are generated during the mechanical and thermal production process and will be most likely released during the use of the parts. This may cause unwanted warping or deforming.

For example:

  • During machining of complicated Al-casted components it is sometimes necessary to interrupt the machining process for certain stress relieve measures. DC treatment before the machining process can prevent such time consuming steps.
  • Gun barrels. In sport up to 5 and more shots are released within a short period of time. The barrels get hot and will slightly bend and the scatter will increase. DCT will reduce the scatterband to a minimum.
  • Race engine blocks: When in operation the heat causes warping of the block, increasing friction between cylinder and piston, causing a drop in performance. DCT engine blocks gain up to 5 horse power!
  • Etc.

Over time inner material stresses and / or unwanted grain structure changes may cause dimensional changes in the component – it will naturally age. The DCT process will age the components right away resulting in a dimensional stable product over lifetime.

In detail:

(Quote: “Wikipedia”, Feb. 8th, 2011)

Retained austenite is an unwanted phase when producing steel. RA is unstable and will change over time in ferrite and cementite, and by variable temperatures and mechanical loads it will form into martensite. When changing to martensite the grains will change from cubic face centered into cubic body centered structure; the volume will increase causing inner material stresses. The volume increase is dependent from the carbon content.

For example

  • Precise cutting-, punching- and forming dyes
  • High precision optical components
  • Test mandrels, gauges, etc
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