Hi all,
Have some parts made from 300M. Been doing standard processing per AMS 6419. Tensile specimens come back with good ductility and yield. Issue is recent brittle failures at low stress levels. Potentially impact loaded, but nothing that's very different from normal use.
I've been playing...
Wondering if anyone has used PEEK for a piston seal on here? Application is for a linear seal. Normal design is a standard slipper seal with o-ring underneath a ring of PTFE to energize. If I replace the PTFE with PEEK it should still work I think. Benefit is increased extrusion resistance and...
Hi all,
I'm hoping someone can back me up here. I'm making some extreme stress parts out of 4340 round bar per AMS 6415 (air melt). They are machined in the normalized condition then send for hardening. Tempered at 475F to 50-52 HRC. Tensile tests on some test coupons done with the parts put the...
Hi all,
Utilizing 4330 MOD per AMS 6411. After going through the document I found it odd that a temper temperature was not listed in order to hit the minimum mechanical properties specified. Below I list the heat treatment spelled out in AMS6411H.
3.4.5 Response to Heat Treatment
Extracted...
Hi all,
Designing some parts out of 300M VAR per AMS6417 and heat treating per AMS2759/2. I have some general metallurgy questions regarding normalizing and it's effect on the material's response to heat treating.
The raw stock is sent to us in the hot rolled normalized and tempered condition...
Hi all,
Problem: Parts made out of 440C are too brittle. Need more toughness and ductility. Current parts are tempered at 600F to HRC 56.
Solution: Re-heat treat to reduce hardness and obtain increased toughness and ductility. Using 440A as reference. Shooting for HRC of 51.
Question: Is it a...
