Failure Modes of Tungsten Carbide Cutters Ⅷ
- Details
- Category: Tungsten Information
- Published on Friday, 16 October 2015 11:42
In part 7 we know that adhesion wear happens when tungsten carbide cutter surface rubs with another high-pointed contact surface under certain excessive friction and pressure, and with temperature increased the carbide surface is plastically deformed, penetrated by high points and result in material loss. In this part we will talk about which tungsten carbide grade shall we choose when we meet with a concrete failure mode.
The useful life of a tungsten carbide cutter is determined by many factors. These include the composition and properties of the carbide, the geometry of the carbide component, the design of the assembly, and the chemical, physical, and mechanical environments in which the carbide operates. Changes in any of these factors can produce an associated increase or decrease in service life. The chart below considers only one of these elements – the tungsten carbide grade. Here is a table for clearer explanation.
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If the problem is… |
Switch to a grade…. |
|
…abrasive wear or erosion, |
…of lower cobalt or nickel content and/or one with finer WC grains (i.e. a harder, more wear resistant grade). This will result in some reduction in strength and toughness, however. |
|
…corrosion or leaching, |
…with nickel rather than cobalt as the metallic binder and/or one that contains other corrosion-inhibiting additives such as chromium or molybdenum. |
|
…cracking or fracturing in metalworking applications where high compressive stresses or impact are present, |
…of higher cobalt or nickel content and/or one with coarser WC grains (i.e. a grade of greater toughness). This will result in reduced abrasive wear resistance, however. |
(To be continued. This article is divided into 9 parts and this is part 8, for part 7 please refer to http://news.chinatungsten.com/en/tungsten-information/79387-ti-10153; for part 9 please refer to http://news.chinatungsten.com/en/tungsten-information/79413-ti-10159)
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