@MikeHalloran. Not being familiar with the 'exploding wire technique', a quick look at some info on the Internet gave the following relevant information to give you a scientific reply. For the exploding wire technique, the basic components needed for the exploding wire method are a thin...
@tbelna, Materials science provides scientific evidence that even in sintering of cermets such as silicon carbide, diffusion of grains to other grains boundries creates a bond which we call "diffusion bond" which is a "metallurgical bond" On a lighter side having played football in the old...
NO, ESD positively, definitely, absolutely etc., etc., develops a metallurgical bond with the substrate by melting the surface and alloying/ boding with it
Electrospark deposition (ESD) was developed in the Soviet Union and came to the USA when one of the national laboratories, used it for depositing zirconium on stainless steel. This is a good technique to put a metallic or a cermet such as WC, TiB on a component for wear resistance. The...
I searched the Internet for a company or an organization who could design a machine for chromium carbide overlay on small components. I am familiar with large scale systems for steel plates and pipes. I would like to work with a designer-manufacturing company for overlay coating for small...
Thank you tbuelna, I am already in contact with the manufacturer of this product. It appears there are few engineers in this Forum who are from the rust belt and who operate industrial furnaces. I am trying to get information if anyone has used high emissivity coating in industrial furnaces and...
Hi Dougt115, I read the string of suggestions, Some have suggested surface coating as a possible solution. I do research on surface modification using a technique called Electrospark deposition. I have successfully reduced wear in some industrial components. Since the wear areas mentioned in...
Above 1400 F heat transfer by radiation is greater than by convection, During radiative heat transfer, energy is transmitted from a refractory wall at higher temperature than the metal part to be heated. Generally the emissivity of the refractory is less than 0.8. NASA has developed high...
I hope the image from WIKIPEDIA tensile testing is uploaded. If not one can go to this reference and look at Various shoulder styles for tensile specimens. Keys A through C are for round specimens, whereas keys D and E are for flat specimens. Key:
I am referring to the B and D which show A...
maxj. I am not familiar with moly type grease or actual tensile testing machine construction and maintenance, since I work in the area of surface engineering for wear resistance. Also the components I worked with are called "wedges" which grip the specimens. These are generally dry at least in...
Too many assumptions. One can not respond to all hypothetical cases.
The fact is that in the testing labs generally do not use Moly type grease. Perhaps it is not specified by ASTM.
The damage is generally on the surface that grips the specimen. The serrations get damaged, if not by galling...
I agree with both EdStainless and tbuelna that the cost of the wedges/grips (from $1000 to $3000) are insignificant compared to the cost of preparation and testing. However you may like to read the following real life event. In one of the companies manufacturing aerospace material (superalloys)...
Grips used in tensile testing can be refurbished and used again. Are there any tensile testers who discard grips and wedges when they gall and the specimen begin to slip?
Fretting is a wear phenomena when two steel parts for example a holder and spindle mouth, rub against one another. Fretting is caused by imperfect mating between
toolholder taper and spindle, creating vibration and heat which develops the fretting. A cermet coating of tungsten carbide can reduce...
1500 F puts the steel in the austenitic range where the steel has very low strength. If you contact Technovations International Inc at technominervaatgmail.com, they may help you with selecting a high temperature metal.
thread284-275265 I saw this post to-day after I joined eng-tips. I had worked in a stainless steel hot strip plant. One of the difficulty faced by us was the wear of the rotary shear knives for edge trimming/cutting. Their edges got dull after one shift and we had to change the rotary shear...
I am doing research on how micro deposit of hard materials like tungsten carbide can reduce wear of components. I am interested in knowing which mechanical components wear out in less than a day or week. The wer should be restricted in a small ares
