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Hi Compositepro, Thanks for addressing me in the right direction. Considering the limited hardness increase given by the measurements, my guess is low plasticity burnishing. Will dig into further.

Hi metengr, Thanks for spending some time on my question. This process is used for a connection to a shaft in contact with a bearing. I hope to receive first-hand information from the supplier, for the moment based on the few comments I was able to collect the process should involve a "stylus"...

Hi, Is there anyone familiar with this machining operation? I am struggling to find any information on the Internet, maybe it is known with another name but I am bit lost at the moment. Thanks for your help.

The black finish is likely due to post-oxidation, which is expressly aimed at improving corrosion resistance. This presentation may also be of some help.

Given the few information provided, here is the best source I can address you to: ASTM E606 / E606M - 12 Standard Test Method for Strain-Controlled Fatigue Testing

Damage tolerance assessment is quite a difficult practice, but there are some rules of thumbs that engineers exploit to evaluate the safety of a component or structure. For example, one can hardly quantify the amount of energy that a structure can withstand upon impact; but reasonably the...

I would rather say the opposite. Ductility is made possible by the presence of several slip systems, which make it easier for extrusions and intrusions to originate on the surface; from which fatigue crack initiation is triggered: To confirm this, austenitic stainless steels and copper alloys...

Ok, I thought there were some other constraints forcing the use of 1018. If this is not the case, you can simply use a medium carbon steel like 4140, 4340. You can easily reach through hardness values above 50 HRC on such a thin part.

By case hardening a low carbon steel you raise the carbon content to that of a high carbon steel, which is indeed through hardenable. With such a small thickness you will end up with an entirely carburised washer and the unbalanced compressive stresses will make it warp just like it happens with...

Hi, Do you mean a carbon steel that is already operating? Wouldn't it be easier to shot peen it instead?

The short answer to your question is yes, there is a relationship between fatigue and vibration. In fact, the stresses that originate at resonance are exploited in ultrasonic fatigue testing to reduce the explore the very high cycle regime (between 10^7 and 10^9 cycles). As a dividing line, if...

Hi, Just to make sure we understand each other: S-N curve -> used for finite fatigue life Fatigue limit -> used for infinite fatigue life All modifying factors you mention usually apply to the fatigue limit only and are therefore used in the second approach. The S-N curve, although...

Okay that's a cute answer and perfectly legitimate considering that you are a student, now let me regale you with some words of wisdom :) [ol 1] All materials are tested before being commercialised: it's generally true, but the test may vary a lot depending on the intended use of the material...

Ditto tbuelna, 6915 is a former SAE grade that should not be anymore available. I have only one objection, full hardening steels are actually finding an increasing use in diesel fuel injection equipment, and in such application the knowledge of fatigue data is of great relevance due to the high...

I am a bit confused by your request, since according to Shigley the endurance limit already corresponds to a fatigue strength in the range between 10^6 to 10^7 cycles. So, based on the classical infinite-life approach, you should keep stresses well below this limit (and take into account all...

Hi, [ol 1] The fatigue behaviour of WC can be controlled. Indeed, being a composite material, not only you can change the composition of the binder and the carbides, but also their shape, size, distribution, weight fraction. See this article for a nice overview of the many parameters involved...

The SN curve and Paris curve represent two different design philosophies. The classical approach assumes a flawless material and bases the calculation on the SN curve, while according to the fracture mechanics approach the material is already cracked before being put into service and its...

Hi, Perhaps what confuses you is that Werkstoffnummern are not used exclusively by DIN standards. Indeed, there are at least two additional German institutions that employ the same designation, i.e. VDEh (Verein Deutscher Eisenhuettenleute, German for "Iron and Steel Institute") and VdTÜV...

In my company we have been using it since quite a long time so we get good discounts. Moreover, a corporate license provides the access to an unlimited number of people via IP recognition (useful if you are part of a big company). If you are dealing mainly with German suppliers, you may want to...

There is a nice quote from James Kelly, former Technical Director at Rolled Alloys, which says that "availability is the most important material property". When dealing with metals, soon or later one will run into the awkward situation in which the material that best fits a certain application...