Failure Modes of Tungsten Carbide Cutters Ⅵ

In part 5 we know that although carbide material is hard, tungsten carbide cutters can still deform plastically due to a high enough temperature to soften the binder metal, and such a tiny thermal deformation can result in the function failure of assembly tools. In this part we will talk about cracking which is also one of the most common failure modes of tungsten carbide cutters.

6. Cratering failure

Failure known as “cratering” is a localized form of erosion in which a depression develops at the point where a continuous stream of metal or particulate-bearing liquid or gas strikes the working surface of the tungsten carbide cutter’s component. At operating temperatures high enough to soften the binder metal (those exceeding about 900° C.) cratering can take place rapidly. Very fine-grained carbides are particularly susceptible to cratering since smaller grains are locked into the carbide surface by a relatively thin layer of binder metal. As the crater increases in size and depth the carbide is weakened to the point where normal operating stresses produce mechanical failure in the area of the crater.

(To be continued. This article is divided into 9 parts and this is part 6, for part 5 please refer to http://news.chinatungsten.com/en/tungsten-information/79348-ti-10146 ; for part 7 please refer to http://news.chinatungsten.com/en/tungsten-information/79387-ti-10153)

Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

• < Prev
• Next >