Sheart strength of sintered tungsten carbide 1

[dcopps]

I am looking for an authoritative source for the ultimate shear strength of sintered tungsten carbide. I am particularly interested in finding this information over a variety of temperatures.

Thank you.

-Dale

 

[EdStainless]

You can find compressive strength data in ASM handbooks.
Shear, that could be a different matter.

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Rust never sleeps
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[dcopps]

You're right. ASM has lots of properties, but nothing I could find there on this one.

 

[tomwalz]

Not sure if I am splitting hairs here but I don’t think of WC as shearing but rather fracturing.

In assessing a grade of WC as to its suitability for a particular use you may get a Transverse Rupture Strength (TRS) given as a single figure or a range. This is helpful but often not as helpful as one would wish. We look at WC as having two properties of fracture; crack initiation and crack propagation.

Lately I have been doing research on the spalling properties of various WC grades with a block of obsidian as a standard. It is early but it appears that there may be something there that will help me predict suitability for use under impact.

However modern grades and advanced grades exhibit different failure characteristics one from another and certainly from the grades traditionally described as “C” grades. We typically work in areas not considered when the “C” grades were originally developed. When you consider that an advanced grade can be tougher than a C-1 and harder than a C-4 with corrosion resistance superior to C-5 through C-8 it really doesn’t fit well.

If your question is about the tendency of WC to fail as it gets hot or after it is heated then that gets to the essential properties of the material. How the material was designed and how the material was made batch by batch. Don’t forget that WC parts are made in batches like cookies and some get cooked more than others.

We have information on thermal stress failure in brazed parts on our web sites at

http://www.carbideprocessors.com

and

http://www.cs4u.org.

They are being reorganized but they should be in pretty good shape now.

Especially find the list of properties to use in specifying WC and the pages on why good carbide is important that show some of the problems with poorly made carbide.

I am working on a problem now where WC has less strength after being run through a Hydrogen atmosphere furnace. It is pretty fascinating. It is not my problem and I do not have permission to publish. When I do I will mention it in our newsletter. (See newsletters under

http://www.cs4u.org.

If you don’t get our newsletter call Emily or Jacque at 800 346-8274 and they will add you to the list.

Tom


Thomas J. Walz
Carbide Processors, Inc.

http://www.carbideprocessors.com

 

[EdStainless]

Tom, you comments reminded me of some past experiences. I used to work in a plant that had some carbide roller tools that were used to flatten an uneven metal surface while it was hot. We had to use coarse grain material with an mixed carbide (not all W) to handle the hot loading.

= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection

http://www.trent-tube.com/contact/Tech_Assist.cfm