Thanks folks. Yeah, short of super slow-mo video of the unexpected failure (big fan of the slow-mo guys on Youtube) we don't have any hard evidence to support one way or another.
I did manage to find some literature in my search that for oil and gas tubing. A design of experiment was run by...
As the header suggests, I'm looking for some literature for my research/investigation that can help differentiate the appearance of debris from a Deflagration vs Detonation perspective.
There are many aspects of the investigation I cannot talk about based on contracts/ legal constraints, so I...
Thanks for the quick reply CoryPad. I'll look into those.
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Bang Your Head (Metal Health)
Gentlemen,
I work at an Aluminum casting facility. Often we add large blocks of pure Mg (between 250 and 1k lbs). Some of these have been quarantined due to excessive surface oxidation.
We have procedures for cleaning the surface mechanically, but it is very time consuming and we have an...
I recently changed jobs to an Aluminum casting facility. We typically use OES for our material composition tests, but in certain situations we perform a wet-chemistry method of detection (typically for the major alloying elements).
We would like to do this for Silicon, due to the higher...
I agree with metenger.
The company I work for makes this grade on a fairly regular basis, and sample 1 does appear to have bainite. I wouldn't commit to martensite from a black and white micro-photo, but the wider streaks all running in one direction look suspiciously like it. Especially if...
I graduated with a Matl Eng degree at the age of 29, after getting another degree in a completly unrelated field (English) and working in a lumber yard for 7 years...
I had a few places tell me 'no thanks' due to my age and the previous degree, but a steel mill gave mea chance and I interned...
Apologies to metenger, I mis-read his post. He is, of course, correct. But with exception, some surface hardness checks can be done non-destructively.
"Metal Health'll cure your crazy
Metal Health'll cure your mad
Metal Health is what we all need
It's what you have to have"
-Quiet Riot...
Hardness testing is not Necessarily destructive. It really depends on your specific use.
As Metenger said, it is not defined as destructive because it can be done non-destructively (with limitations depending on the tools available and the object to be tested).
That being said, if you need...
TVP
Awesome :) thanks for the reference!
"Metal Health'll cure your crazy
Metal Health'll cure your mad
Metal Health is what we all need
It's what you have to have"
-Quiet Riot
Bang Your Head (Metal Health)
Metenger
we cast into 40'+ billets, and anneal after rolling. We pump in some type of inert atmosphere. I can get more specific information if that would help.
"Metal Health'll cure your crazy
Metal Health'll cure your mad
Metal Health is what we all need
It's what you have to have"
-Quiet...
I am an intern at a company that melts and rolls many different grades of non-stainless steel. We have had some consistent issues with de-carb in some high-silicon steels (particularly 1% or higher Si). The grades we melted with this issue also typically have .40% + carbon.
Do high Si steels...
Metengr makes a good point.
Per ASTM A29
"When copper is required 0.20
min is generally used"
since both of these are barely over .2, it seems like this amount of copper was intentional.
Looks like sample 1 is a 5135, if I had to guess...
(ASTM)5135:
0.33–0.38 C; 0.60–0.80 Mn; 0.035 max P; 0.040 max S; 0.15 to 0.35 Si; 0.80–1.05 Cr. no added Ni or Mo
not sure on teh second one... no Boron detected on sample 1?
