In part 4 we know that thermal cracking to cemented tungsten carbide cutters can result from a sudden sharp changes in temperature, as well develop gradually over thousands of thermal cycles under small temperature changes, and for both modes the failure mechanism are different. In this part we will talk about thermal deformation as another failure mode.

 

5. Thermal Deformation 

 

Cemented tungsten carbides cutters retain their hardness and strength to relatively high temperatures, but will deform plastically under load as service temperatures approach the softening point of the binder metal. Although deformation can occur with no loss of material at the tungsten carbide cutter surface, even small changes in the size and shape of the carbide component may result in the failure of the assembly that contains it.

 

 

(To be continued. This article is divided into 9 parts and this is part 5, for part 4 please refer to http://news.chinatungsten.com/en/tungsten-information/79348-ti-10146) 

 

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