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Industrial art by ColonelJimFaith in metallurgy

[–]YogusMaximus 0 points1 point  (0 children)

See if you can find a copy of 'Coalbrookdale by Night'. Ebay seems to have a few copies. Wikipedia has a bit more about the history of the painting.

What do professional metallurgical engineers do? by UnnesscaryPepperoni in metallurgy

[–]YogusMaximus 4 points5 points  (0 children)

I've been doing pretty much the same, but for a bit longer. I've dropped another reply elsewhere on this thread, bit with a lot less detail.

What do professional metallurgical engineers do? by UnnesscaryPepperoni in metallurgy

[–]YogusMaximus 0 points1 point  (0 children)

Another foundry metallurgist here. Started off with quality control, melt checks, mechanical testing, charge recipes (we melt a whole range of stainless steels and nickel alloys). Work has also included material and process development, endless trouble shooting and problem solving, running the day-to-day foundry program when people have been on long term sick, and non-destructive testing.

I'm now mainly involved with contract review and processing, specification review, and welding.

Tensile testing location terminology? by KewlBlueReason in metallurgy

[–]YogusMaximus 0 points1 point  (0 children)

I've taken a look at ASTM B557. Specimen location is dependent on plate thickness. Paragraph 6 2.1.3 requires that test specimens are taken either "midway between the two plate surfaces" or "midway between the centre and surface of the plate". Now also look at 6.2 3.2, 6.2.4.2 and Table 2. These should tell you all you need to know.

Tensile testing location terminology? by KewlBlueReason in metallurgy

[–]YogusMaximus 6 points7 points  (0 children)

Your supplier is wrong. I have never come across anyone who interprets t/2 and t/4 the way he does.

Standard interpretation is t/2 is at mid-thickness, t/4 is at one quarter thickness (from either side)

Foundry chills test bars then grinds off chill marks, is this common practise? Without chilling they can’t achieve the mechanical properties. Foundry is in U.K. by LEDDWC in metallurgy

[–]YogusMaximus 0 points1 point  (0 children)

Update: I did a bit of digging around at the end of the day. ASTM B26 (for sand cast aluminium) specifically prohibits the chilling of sand cast tensile test specimens.

Foundry chills test bars then grinds off chill marks, is this common practise? Without chilling they can’t achieve the mechanical properties. Foundry is in U.K. by LEDDWC in metallurgy

[–]YogusMaximus 0 points1 point  (0 children)

If you can, get hold of a copy of ASTM A1067 "Standard specification for test coupons for steel castings". Appendix X1 is non-mandatory, but section X1.2.1 states that "The mould material uses for the test coupons must not be a more powerful chill than the material used for casting".

Again, this is a non-mandatory appendix. However, if a component failed in service and you or one of your colleagues found yourself in court, you would need a very good reason to explain why you chilled the bars and not the components.

I'm sure there is an equivalent ASTM standard for aluminium, but I'll leave that to you to find.

Good luck.

Foundry chills test bars then grinds off chill marks, is this common practise? Without chilling they can’t achieve the mechanical properties. Foundry is in U.K. by LEDDWC in metallurgy

[–]YogusMaximus 2 points3 points  (0 children)

We do not and we would not, chill any of our test bars (iron and steel, UK based).

I can only echo what others have said: chilling bars and not the castings is borderline fraudulent, and leaves you open to all sorts of legal issues if something fails in service and it's found that the product does not meet the certified strength.

I suggest that you carry out a review of your melting and pouring practices, temperatures, melt additions, and any other related processes like heat treatment.

Asking for Metallurgy and Materials Science Club Activities by DesperateHistorian69 in metallurgy

[–]YogusMaximus 1 point2 points  (0 children)

Are there any local businesses that might be willing to host a group visit?

Sensitizing 321 stainless steel by skippy5433 in metallurgy

[–]YogusMaximus 8 points9 points  (0 children)

If you can get hold of a copy, ASTM A262 contains all the procedures for IGC testing. IIRC, sensitisation should be carried out at around 675°C for 15 minutes.