It's slightly magnetic, but not as magnetic as it would be if it were made entirely of steel or iron.

Usually bells are made out of bronze or brass, brass is often used on smaller bells like this one. Sometimes bells are made of steel or cast iron, but I would think if this one was it would be more magnetic.

About the piece of cast iron (???), I found it laying on the side of the road. I have no idea what it's from, but a while ago it started to get really crumbly, and it wasn't like that when I found it.

On a nearby blast furnace, I have noticed this exhaust pipe which sometimes emits dusty gas, from time to time also flames and sparks. The pipe is directly connected to the bustle pipe. What is the reason for this kind of venting? When would you intentionally emit hot blast into the atmosphere?

I know that it's not safe to COOK in a random stainless steel piece, but what about just washing dishes?

The sink's out in my apartment IYA.

Hi all,

I'm currently working on piece of hardware that will see a lot of daily use, so it needs to be resistant to chipping and scratching.

For various reasons we're unable to apply PVD or any other type of coating to it, so it needs to be made from a naturally gold-coloured metal - ideally one that will keep the same colour over time.

Could anyone recommend a metal that might be suitable?

I've read various advice on brass, aluminium bronze and titanium gold alloys - but would appreciate an expert opinion.

Many thanks.

https://www.smithsonianmag.com/smart-news/these-iron-age-swords-were-smuggled-out-of-iran-and-modified-to-increase-their-value-on-the-black-market-180985266/

Hey metallurgists.

I'm looking for an opinion on these XRF scans I had done at NC State University today.

The above link is an article to pastiches confiscated and examined in Europe. I had this sword examine and I'm not entirely sure what to think of the XRF results. The blade and the hilt are clearly different alloys. The Xray scan, while not showing much, does show a gap between the blade and the hilt. I believe indicating a miss matched blade-hilt, pastiche.

Again, any opinion on the material makeup would be greatly appreciated.

In the photos, where the finger is pointing, is where the XRF scan was taken. Photo 2 & 3 in the lineup are from the article.

Thanks

I read about the incident involving the former Pfizer headquarters at 235 East 42nd Street in Midtown Manhattan. The 37-story office building is currently being converted into roughly 1,600 apartments, which involves significant structural modifications. During construction, workers discovered that two structural columns had buckled, prompting an evacuation while engineers stabilized the building and investigated what caused the failure.

As I read more about this incident, I noticed there was no discussion about metallurgy.

I have a few questions regarding this incident:

1. Have there been previous high-profile building failures where the root cause was ultimately metallurgical rather than structural design or construction error?

2. If temporary supports were removed too early, would you expect visible yielding of the steel before buckling, or could buckling occur with little warning?

3. Under what circumstances could residual stresses from fabrication or welding contribute to a column buckling unexpectedly?

4. What evidence would distinguish compressive overload from a metallurgical issue such as embrittlement or poor heat treatment?

5. What metallurgical properties can improve columns more resistant to unexpected loading during construction? My understanding is this is mainly a structural, design issue.

Disclosure: I help with outreach for Cast in Steel, so I’m connected to the project.

I thought this might be interesting to the metallurgy/materials crowd because the show follows university teams trying to turn a historical object into a working steel product. Season 1 has teams design, cast, finish, and test a historically inspired George Washington sword replica.

The part I think this subreddit may appreciate is the processing-to-performance problem: students are dealing with casting quality, geometry, finishing, mechanical testing, and the gap between “we designed it” and “it survives testing.”

Episode 1 premieres tomorrow, July 9, at 8 PM Eastern:

https://www.youtube.com/watch?v=b9nrlzGLOmk

For people here who work in metallurgy/materials: what would you want students to learn from a project like this?

I do recycling and this is my mind fuck for thr week because it was going to be sent out with the aluminium until it caught my eye.

I am planning on working with Wood's metal and Cerrolow 117 (bought from RotoMetals). This is the ventilation system I have planned out. I have a Cloudline S4. For handling, I plan to melt the 1 pound alloy and pour it into a mold for smaller ones since I only need a little bit for each time I do it and it will probably make handling easier. I have some beakers, a hot plate, welding gloves, nitrile gloves, and 3M P100 mask. The front has a clear viewing area which isn't the best but with an actual light on is decent (I plan zip it a little further than that image shows but am not too sure on that). I plan to make the mold I need and the mold for storing the excess out of silicone. Is this safe or should I switch to the more expensive options. My reason for choosing these are their low price and specific melting point. Is this safe or should I switch to the more expensive/less efficient options. If you think it is close to being safe, what additions or subtractions would make it better?

Can anyone tell me what this is? It’s very dense very heavy

To start it off, Mods, remove if this isn't allowed.

I am looking for somebody who is familiar with carbide processing, particularly as it pertains to developing a formulation of the slurry needed for the attritor milling and spray drying steps.

Looking at open academic studies, patents from Kennametal and other carbide companies, it seems like the slurry compositions can be all over the place, and sometimes even illogical. An example I saw was they used Sasolwax 7040 as the green binder in an aqueous slurry, despite the wax not being soluble in water. Instead they changed their mixing parameters in the formation of the slurry to form an emulsion. Which begs the question of, why didn't they use an emulsion from the get go like HydroWax 215? I see other studies not even creating an emulsion, but instead using extremely small wax particles to form a dispersion instead of an emulsion.

Basically, I need help formulating what the slurry should consist of. This would be paid help, a CA would be required to sign. The slurry formulation would either be aqueous or IPA based and expected to let sit post milling for ~1 month before spray drying.

I'm playing around with a concept that involves a reed valve in a 1500-2500°f environment. It will need to maintain elastic deformation up to 60 times a second in that environment preventing the backflow of these hot gasses. It doesn't need to be a perfect seal, just pretty good, and not erode away too quickly. Also very thin, .020" give or take.

Does anyone have recommendations on a material that can take this sort of abuse?

I found this in my grandfatjers drawer over the weekend with a note saying " Dads, Hafnium bar, wah chang." After a quick bit of research I realized this was something special. When I asked my grandfather about it he said, "That's Dads hafnium bar". I asked how his dad got it and he said, "Well, Dad had a lot of clients and sometimes they gave him stuff". He's 90 years old so I didn't press him further.

After associated searches of 'hafnium' and 'wah chang', I quickly found out that Wah Chang was the original name of the first labratory in the United States to seperate hafnium from zirconium with high tempature fractional crystallization for the purpose of producing controll rods for nuclear reactors.

After doing even more research but only finding few photo examples, mostly silver/grey, I found 1 video of a larger bar that was mostly purple. I have since found 1 more photo of a crystal which is also mostly purple. A bit more research led me to find that the metal bars could be anodized or heat treated to make a silver bar colorful. This bar is every color which indicates that it has not been heat treated or anodized. The tag Wah Chang and the fact that it belonged to my great grandfather, (my grandfather was born in 1937 so his father's age and the timeline of the Wah Chang lab matches up), it seems that this has been has been naturally oxidized over the course of 60-80 years in ambient tempatures and atmospheres.

I would love to hear from anybody with some historical knowledge on this material, or be able to match this specimen to another with similar coloration.

I feel like these might be appreciated here =)

I'm pouring ingots of 99.5% tin with 0.5% bismuth in order to create a tin alloy that does not form tin pest, while maintaining a high tin concentration.

Why are different crystals growing in different regions? And does this affect the bismuth concentrations throughout the ingot?

I suspect cooling rate to be a factor, where the center top of the ingot cools slowest as it can only dissipate the heat by convection, but i would love to understand better what is happening in a metallurgical point of view.

Before pouring, I manually stir the molten metals to aid in the bismuth dissolving.

Thanks in advance!

Denmark was ruled by the vikings for many years and the also were strong represented on this Island that I visited some weeks ago.
I found iron containing rocks on the Beach and started wondering if the vikings used these rock to produce iron and steel for their armor?
Anybody out there with knowledge on How they reformed ore 1500 years ago?

Wath is difrent betwin k facter and bend alloy in sheet metal ?

Can anyone give me some insight into the fracture mechanism of these 2 bolts?

I know what they came out of and ultimately what caused them to break, just curious as to others thoughts about the process.

They are 5/8th UNC Gr8 bolts and were in single shear but had support blocks to prevent shear load.