I have a "brittle" material (Mn-Ir antiferromagnetic alloy), cracking is often created right after hot flattening or, at water jet. Micros analysis indicates an intergranular cracking. so decreasing grain size could help, but decreasing hot roll temp for smaller grain can crack material at...
Does an AC magnetic field (say 100Hz) attract iron filings? my guess is No, but never tried.
A practical question is, could the magnetic field in a VIM cause iron contamination (pick-up) from the iron particle residuals (from previously iron-based melt) on the melting chamber?
anyone in the society is aware of/familiar with this method for PTF of magnetron sputter targets?
in 9.2, "Magnetically condition the target by rotating it counterclockwise on the target support table five complete turns", what is the purpose of "magnetically condition"? in the note it claims...
We have an EDM cracking issue to solve. The material was a chill casted alloy with a columnar structure perpendicular to the cutting plane. The alloy is very brittle in nature, we have tried different casting methods to make it cracking free before EDM to cut into slices, using copper mold for a...
Is dendrite bigger than grain, or grain bigger than dendrite, or they are the same?
I have a binary alloy. It is easy to see the dendrite structure, but I never see grain structure no matter what etching method is used.
i am hot pressing atomized powder, the alloy is brittle and very reactive. oxidation and cracking are the main concerns. I am thinking about de-gas before hot press (no vacuum press capability) and HP under low pressure high temperature. would these techniques help? Other tricks? relatively...
The thin (.005'') PH stainless strip got heat tints after H2 anneal. Material will be aged and then acid passivated.
Do the heat tints have a negative effect on passivation? Or, it does not matter because the acid could eventually clean up the tints?
When straightening and cut from coil to bar, a noticable diameter increase is observed (confirmed this is not due to the measurement/material variability). Anyone knows the physical/metallurgical reason behind?
Also a strength level decrease is observed after straightening, whcih is not...
Anyone knows the possible physics behind this?
I did stress relief annealing (800, 850, 900, 950F/ 4hous) on heavily cold worked flat 316 LS bars. It was found tensile and yield strengths were increased considerably! It seemed unlikely the test variation issue because all 4 temperatures had...
Does anyone have experience in the effect of Al on machinability/polishability for Type 431. We currently have a heat with Al .004%, but customer wanted .001% stating "high" Al is detrimental. Is this anecdotal, or scientifically sound?
I have two N strengthened steels, one has N .1%, the other .2%. The lower N one has a lower yield strength but higher elongation. Are you expecting poorer machinability from lower N steel?
I have a customer claim for lower N steel saying it promoted the hardening during manufacturing process...
Anyone has an idea why ASTM A276 "Standard specification for Stainless Steel Bars and Shapes" doesnot include the mechanical requirements for 420, 431, and 440, while all other grades, including 403, 410 martenstic grades list the strength requirements (refer to Table 2)? Thanks!
Anyone has info. regarding the compatibility of 405 and carbon steels with rocket propellants such as hydrazine, mono methyl hydrazine (MMH), nitrogen tetroxide (NTO) and nitrogen tetroxide with 3% nitric acid (MON3)?
Thanks in advance!
We reheat and then soak a specilty steel for 3 hr at a temperature about 100C below austenitizing temperature, and then quench in a water spray tub. It is coil strip with a thickness of .1''.
The material is breaking during re-coiling at the take up reel. SEM anaysis of fracture surface showed...
During the static full-flux test, the stator windings were put through several full-current thermal cycle cycles that were quite severe. After that, the stator windings were subjected to resistance testing and leakage current testing. It was found that several of the stators exhibited...
My customer asks for .147mm - .151mm strip product, i.e. the tolerance is +/- 1.34% (width 12''), saying another supplier can meet the tolerance. Is that possible? If yes, what kinds of equipment or practices are needed to accomplish that tight tolerance?
