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Questions tagged [metallurgy]

Metallurgy is the science of the production and the processing of different metals and other metallurgic usable elements.

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1answer
26 views

(moulded) cast properties of the untreated surface

While my research about the untreated surface of moulded cast I read that the properties such as tensile strength, 0,2% proof stress and so on are different (much smaller) from the properties you can ...
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0answers
21 views

In oxidising roasting why phosphorus can't oxidising?

In the sinter process of oxidising roasting, why phosphorus can't oxidising?
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1answer
22 views

Effect of annealing on the defects

What is the effect of annealing on the defects present in the sample? Does it remove defects in the sample? Is there any chance that due to annealing the point defects present in the sample combine to ...
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0answers
16 views

At which stage can borate solutions be injected to metallurgical coke?

Borates are effective to increase CSR of metallurgical cokes so that can be added to the metallurgical coke in the process, which place is best for this belching process? Coke ovens? Coke ovens (...
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1answer
33 views

Is it possible to cast copper around another metal

So i have seen these super conductor rods around (which appear to be copper around titanium/niobium). Now I am wondering (for a maker usecase) if its possible to create something similar by for ...
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0answers
13 views

Electric Current Based Shape-Memory Alloy

Would it be possible to create a piece of metal, made out of an alloy or combination of alloys, that undergoes a shape-memory-esque change in structure in reaction to an electric current? Could it ...
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1answer
30 views

Fastening rotating surfaces

This is probably very well explained but I'm lacking the terminology knowledge and that's keeping me from finding the information I need. I have a frame to which I need to attach a weight carrying ...
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0answers
27 views

How to produce aluminium powder by E. J. Hall method

I have watched videos on YouTube producing Aluminum powder by mechanical methods. Like this one. It uses Aluminum foil and coffee grinder: There are similar videos which use the same basic method but ...
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0answers
17 views

How to calculate feasibility of %1 CSR increase of metallurgical coke?

We want to increase CSR (Coke Strenght After Reactivity) value of metallurgical coke by adding borate solutions on industrial scale. How to calculate feasibility of % 1 CSR increase of it for 1 ...
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1answer
52 views

Why do Blast Furnace flue dust generates high rates of Zn (Zinc)?

The Blast Furnace flue dust contains high rates of Zn (Zinc). I'd like to know the reason behind this. The chemical reaction of Zn inside blast furnace dust. Why it's rates becoming high?
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1answer
57 views

How do old wind turbine towers pickup magnetism overtime?

I was conducting some robotics tests on a old wind turbine today, and noticed strong magnetic fields around the steel tower. This magnetic field does not exist on other modern wind turbines at the ...
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0answers
25 views

When were the japanese yellow/white/blue/silver paper steels introduced?

The steel series called kigami/shirogami (yellow/white paper steel, high purity carbon steels in different grades), aogami (blue paper steel, a tungsten alloyed tool steel series), aogami super (a ...
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0answers
21 views

Steel Worm/Steel Wheel vs Steel Worm/Bronze Wheel

I have a question regarding worm drives, specifically double-enveloping types: Do steel worm/steel wheel combinations last longer than steel worm/bronze wheel or steel worm/brass wheel combinations? ...
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0answers
18 views

Can heat treated steel have a higher resistance to thermal distortion (while welding) than normal steel?

I'm working with SAE1141. There are other ways of dealing with weld distortion too, I imagine, but changing the welding setup would be too expensive for now.
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1answer
38 views

Engineering standards or testing standards for hot punched metal holes for rolled steel

So, I have a problem with fatigue cracking originating from hot punched holes. From failure forensic reviews, it seems like surface conditions contributed to some of the failures, especially where ...
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1answer
31 views

What are equations related to the compaction of composite metal powders?

Say I am trying to create a metal composite and have a mixture of 3 different metal powders each with varying weight %'s. I'm going to compact them into the shape of a ring by applying a force P. The ...
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20 views

Phase prediction by cct diagram

Can someone please help in finding out the phase proportion of each phase w.r.t time , cooling rate and temperature by using (mathematical model to predict phases from given cct diagram) Leblond ...
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1answer
27 views

Kfactor for laminated steel plates rolling

I need to make a flat pattern for a cylinder made from a steel plate 44mm thick laminated with explosion cladding stainless steel plate of 8mm total plate thickness is 52mm. How I usually work is ...
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0answers
20 views

How to find phase proportion at equilibrium - from iron-carbon diagram - Leblond

{Equilibrium proportion P, this is the proportion which is reached at a constant temperature after an infinitely long time:P is also the austenite proportion in the case of extremely slow heating. It ...
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1answer
96 views

what actually cause quench cracking ? non-uniform cooling or rapid cooling?

It’s well known that quenching most alloyed steels starting from AISI 4140 to high speed steels in water, brine , or sometimes oil will cause cracking and distortions. in industry oil quenching ...
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2answers
146 views

What is the strongest and lightest material?

I have heard titanium is the strongest and the lightest material. It is used for my glasses frame. Is it true that it is the strongest and the lightest as well? Strongest, the biggest forces can it ...
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1answer
109 views

Can high alloy tool steels be quenched in brine?

It is will known that most of tool steels are quenched in oil to prevent cracking and distortion which appears when quenching in water due to non-uniform cooling caused by formation of insulating ...
2
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1answer
57 views

Is there is vanadium-free high speed steels?

Vanadium is present in all high speed steel grades. unfortunately vanadium not only very expensive but is also a will known cytotoxic metal. some workers get severe persistent cough lasts for months ...
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2answers
91 views

which type of casting will give higher cooling rate, casting in thin water-cooled copper mold or casting in thick copper die?

It is will known that increasing cooling of a metal casting will lead to finer micro-structure which mean higher mechanical properties. If I have 2 molds one is thick copper die ,& second is just ...
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1answer
318 views

What's the Difference Between LT and T Directions?

What is the difference between LT and T directions in MMPDS (formerly MIL-Handbook 5)? I hand understood that forming metal orients its grains, destroying the isotropic nature of 'pure metal' and ...
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1answer
167 views

Carbon Phase Diagram vs. TTT diagram

A "Carbon Phase Diagram" has an upper and a lower transformation temperatures. It was my understanding that once a steel had cooled below the lower transformation temp (1333 deg F) that the austenite ...
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1answer
371 views

What is the difference between work hardening and strain hardening?

I have come across the definition somewhere,"Work hardening, also known as strain hardening, is the strengthening of a metal or polymer by plastic deformation. This strengthening occurs because of ...
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1answer
408 views

Galvanized Steel (Zinc Plated Steel) vs Stainless Steel

Zinc Plating is known for its ability to prevent most corrosion, and it is done by just dipping a metal in hot pool of zinc and letting it cooldown. Meanwhile, stainless steel, an alloy that is ...
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1answer
168 views

Why are vacancies in solids called as equilibrium defects?

My professor, when discussing about Random Walk model during diffusion in metals said that "Vacancies are equilibrium defects but dislocations are not". I could not understand why. Why is it so?
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1answer
140 views

What is the most corrosion resistant 55HRC stainless steel?

55 HRC is a very high hardness, even for steels. Ideally the corrosion resistance of the steel would have to match AISI 316L or be even better. Qenched stainless steel can go to 55HRC. Even to 65 ...
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1answer
110 views

Which materials we can use for storing liquid nitrogen?

What are the materials we can use for the long-term storage of 30~liters of liquid nitrogen with composition and grade, along with the thickness of the sheet and storage capacity? Can we use any ...
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5answers
123 views

Is it practical to make a solar furnace for small scale metal production?

Solar furnaces using mirrors to concentrate sunlight on a small area do not produce much power - perhaps 1kW per square metre of mirror - but can reach very high temperatures. From the earliest ...
2
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1answer
116 views

Arc welder? Cheap welding device for chainmail/chainmail jewelry

I'm hoping this is the correct StackExchange for this question/request for advice. I'm looking to buy a welder to introduce me a little to welding, my main use-case right now is the hobby projects I ...
3
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2answers
35 views

Where does one go to produce custom metal objects?

I am wanting to produce custom mass plates for a project, very similar to those found in gyms. Here's a rough idea of what each one should look like: This is essentially identical to mass plates one ...
2
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1answer
51 views

Best way to manufacture stainless steel apparatus?

Shown in the images below I have designed a small stainless steel apparatus with accompanying hollow metal cylinders ontop. I'm looking into larger quantity production and simply CNC'ing these would ...
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1answer
366 views

What is strain hardening exponent?

Hardening leads to a material being more brittle.However I can't understand what is strain hardening or strain hardening exponent.Please explain why hardening leads to brittleness also in this answer ...
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4answers
3k views

Benefits and disadvantages of aluminium alloys as a replacement for structural steels in ships

My Answer. Benefits: The major advantage of aluminum in ship building is its strength to density ratio. Aluminum has high tensile strength with less weight, which results in lowering the weight of ...
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2answers
93 views

38CrNiMoAlA: Does it even exist?

I have some plungers made of 38CrNiMoAlA. Their required hardness to be achieved via quenching/tempering is 51 HRC. I've scoured our technical order for heat treatment of steel alloys but the material ...
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4answers
172 views

What is the purpose of grid-like details on engine blocks?

It is common to find this kind of detailing and patterning on engine blocks and related parts. Older engine blocks display much more flatter and simple geometry and this kind of mold work must come ...
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1answer
34 views

What does it mean by “loops and troughs”? [closed]

Actually, I've asked this question in "English Language & Usage" but someone told me ask it here! What does it mean by "loops and troughs" in: "Source has acquired a pattern of loops and troughs."...
2
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1answer
3k views

How to bend copper heat pipes?

I have purchased these copper heat-pipes; however, I am wondering how to bend them without kinking them or cutting them open due to pressure on weak points/bends. These are flat copper heat pipes, so ...
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1answer
479 views

Proper metal for turning/milling a ball-peen hammer

I've got a simple question here. What material should hammer's head be made of? We're talking about medium sized ball-peen hammer, used for riveting brass, copper, aluminum and steel rivets. I have ...
2
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1answer
237 views

What material should I use to store molten metal?

I'm performing an experiment based on slag corrosion behavior of the refractory material. I need to store molten metal at $\approx$ 1600-1700 K for that. Specifically, I'm working on slag corrosion ...
2
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1answer
63 views

Coating gold on to sunglasses lenses?

Recently I have been trying to find out more about the process that is used to coat glasses lenses with gold. I asked about it in another forum last night and I was directed here. I initially thought ...
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2answers
108 views

Which materials can be used to make permanent casting molds for cast iron?

I am interested in comparing the different materials that can be used to make castings of cast irons, and therefore was wondering which material is commonly used/which materials can be used to make ...
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1answer
47 views

What considerations should I take when flame-hardening a wheel?

I'm currently trying to figure out whether or not we can flame-harden a steel wheel which was supplied with a lower hardness than expected. I'm worried, however, that flame-hardening can either deform ...
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1answer
634 views

Circular keyways - advantages / disadvantages?

What are the advantages and disadvantages of using circular section ("Scotch") keys, keyseats and keyways? I am not referring to Woodruff style, I am only interested in the type where the key itself ...
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1answer
185 views

Can I mig weld to my skateboard truck? How can I test if it's weldable?

I have this skateboard truck for my off-road skateboard. I want to mig weld a piece of aluminum to it to mount a motor. How would I test if it is something I can weld to with a MIG welder? I think it ...
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1answer
54 views

Electrical Resistance of molten aluminium oxide [closed]

I would like to calculate or find the electrical resistance (in ohms) of aluminium oxide at or past its melting point, for the purposes of using it as an electrolyte in a molten state. My apologies ...
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1answer
79 views

How to create intersected conical copper coils?

I'm looking to create something like this: But the problem with solid copper wires is it tends to spring back into it's original shape and this construction will flatten. I've tried creating a ...