I have specified round pins be made of 17-4 H1150 double-aged. I want to freeze these pins prior to insertion into bores. My first question, any metallurgical change that can occur during freezing step that should cause me concern?
Second question. My supplier, in their infinite wisdom...
In ISO 3471 ( Roll-over protective structures or ROPS ) there is a section regarding charpy v-notch testing. This section contains a table of charpy specimen size, test temperature, and energy requirement. The language in this section requires steel members to meet or exceed one of the charpy...
Can someone provide or point me in the direction of where I would find a governing industry weld standard for welding stainless steel pipe, used in a pressurized water application? My first search led me to AWS D1.6, but this appears to be a "structural" welding standard, which is not my...
Can anyone provide the typical titanium wt% additive, or ratio to boron, in boron treated (carbon/low-alloy) steels? Ex. 51B60,94B30,15B35. Titanium is typically utilized to tie up nitrogen and allow boron to be effective in increasing a given steel's hardenability.
Can someone who has the MMPDS-03 tell me if it has fatigue data for Al-alloy 7085 other than axial loading? I have the green letter for this alloy, and it contains the axial loading data. I'm interested to know if bending fatigue data is listed. I have noticed that all other 7000-series...
I have an alumina ceramic sample. I would like to know what phase(s) is present (alpha, beta, etc?). How would one go about determining this other than an XRD technique?
Looking for some feedback from users of the Q-Fog Cyclic Corrosion Tester. We are in the process are replacing a 20 year old salt fog chamber, and are extremely interested in the the Q-Fog chamber. Can anyone here provide good, bad, indifferent opinions on this chamber and the quality of...
I have a sample of pearlitic GCI (grade used in a brake application). The material was exposed to an unknown elevated temperature in service. When looking at the microstructure, some of the pearlite is starting to break up (disassociate to form secondary ferrite). At what temperature or...
Can someone please decifer this designation for me in terms of a USA grade? I have a guess that it is a variant of SAE 4140 low-alloy steel (i.e. what is the "V" designating).
I have an aluminum storage tank used for tap water. It is corroding from the inside out in a very strange manner. I have included some photos at the link below. Does anyone recognize this type of corrosion and possible cause? I think I may have two types of corrosion occurring: #1 pitting...
I can't find a good explanation for what this stuff, meonite, is. Can anyone go into further detail other than "it is a gray iron". History? Chemistry? Whose trademark/patent?
I have a bolt material with this chemistry:
C - 0.40
Mn - 1.13
S - 0.005
P - 0.010
Si - 0.26
Mo - 0.22
Cu - 0.17
Al - <0.005
V - <0.005
Nb - <0.005
I couldn't really match it up with a US grade (possibly an SAE 40XX grade). Any idea what this could be? Foreign grade?
I have an aluminum (300 series) casting with a bright chrome type finish. It is mainly an aesthetic coating, although the corrosion protection it provides is a plus. Analyzing the coating I've found it to have two layers: a copper layer and a chromium + nickel layer. The two layers are equal...
Looking for experienced users of never-seez. Can I use it as a pre-lubricant, and then add standard grease on top of it, and expect normal (or better) performance of the standard grease?
Which method from ASTM E112 is typically used (by the foundry's lab) to measure grain size in aluminum castings? Is ASTM E112 the correct standard to use in this case (Al-castings)?
Is there a NDT instrument that can measure mechanical properties? Such as ultrasonic, eddy current NDT? I realize known standards would probably be needed to calibrate such a device/method. What I have is a wrought aluminum stucture that I would like to measure its yield or tensile strength...
I had a request to make a gear set lighter. My colleague asked about using Titanium alloy. I need 166ksi UTS material with a wear resistant surface. Is this strength obtainable with titanium? Can I make its surface wear resistant via some modification treatment (nitriding, anodize, PVD...
