It is possible that the plant constructor is referring to their own material designations within their system. For example, Westinghouse and GE used their own designations in drawings even if the material used was nonpropriatary. In the case of Westinghouse those designations continue in all of...
ASM publishes a handy fatigue fracture chart in the Fractography volume of ASM handbook that has been printed many places. Here is one of the links to Fastenal that printed it: https://www.fastenal.com/fast/services-and-solutions/engineering/fatigue Fatigue zones lead from origin to the final...
Have you eliminated the possibility of microbiologically-induced corrosion? This seems a localized area that was attacked that would not make me think of general pitting corrosion.
Your should pay attention to Ed's comment. There are definite beachmarks at the 2:30 position that indicate a fatigue origin. This is at the outer edge of a feature that may have once been a keyway though it may have distorted over time or from the failure.
Most of the fracture looks like...
Your should pay attention to Ed's comment. There are definite beachmarks at the 2:30 position that indicate a fatigue origin. This is at the outer edge of a feature that may have once been a keyway though it may have distorted over time or from the failure.
Most of the fracture looks like...
There is not a need to post a minimum carbon provided it is a sufficient amount to meet mechanical property requirements. You did not say whether you also met yield and elongation requirements but if you did, then you can be assured there is sufficient carbon in the steel
I wonder if real world environmental conditions are simply too harsh to use unpainted stainless steel as on Cybertruck. It easily shows up dings and imperfections as compared with painted/coated surfaces, and as this thread notes corrosion can occur if conditions are not perfect. (Personally, I...
ASTM A370 only reports equivalent tensile strength for steel hardness, not yield strength. There may well be some proprietary equivalency but I do not think it is reported in any standards. This is the standard of your customer so you have to make sure you meet it.
This steel is not intended for heat treatment. You probably should first google before asking the question. Your answer is in the attached link https://www.steelnumber.com/en/steel_composition_eu.php?name_id=156
When you cut a strip out, it then has to be flattened to pull the tensile unless your wall is thick enough to machine a flat. This can skew results. With a tube like this, I prefer to test it full cross-section if possible.
The failure point where the shaft diameter has stepped down is typical and expected in shaft failures, especially fatigue. This is the point where stress is highest, and not in the corner itself. Visually it looks like fatigue with multiple ratchet marks at5 the OD indicating multiple origins...
Dave, I can see how the scenario you paint can work. Galvanizing is a sacrificial layer. Once it is eaten away, you will get corrosion of the steel substrate. Is the environment this particular fence sees any harsher than the other fences you installed?
I suggest looking at why the screw heads...
I used such software way back (in the 90s!) but the library was not very extensive and often took me in the wrong direction. You really do best using reference books. I always first start with the ASM Handbook (Desktop Edition will suffice) to narrow down my alloy type and see what alloys match...
RolMec is correct: You should not be reusing the bolts in the first place. Always install new ones instead as they will not have experienced any degradation of mechanical properties from previous tightening or service. This is your likely root cause of failure no matter the mechanism.
Regarding...
Given the operating temperature, I wonder if graphitization might be an issue for your application in using P1. Though not too likely, graphitization is expected to occur at temperatures above 425 deg. C. Chrome-moly steels like P11 or P22 are not prone to this mechanism as the Cr ties up the...
This is another advantage to using EDS from a mounted cross-section. You can measure coating thickness in the SEM at the same time you are collecting your EDS data.
Ed, is 0.0005" a feasible distance for an accurate OES quantification?
The advantage of using EDS in cross-section is penetration depth becomes irrelevant so you can select the energy you need to identify plating.
With field XRF (aka PMI) you would need toc clean the surface thoroughly of oxides and contaminants that would throw the results off, and also make sure the beam does not penetrate to the substrate, which may also may throw off results. I question whether OES is really viable as well for such a...
