Which material with high stiffness and good corrosion resistance?
Which material with high stiffness and good corrosion resistance?
(OP)
We have chosen 316L for a piston of Ø 0.8mm but it seems that the mechanical properties are too low for the application = bending pbs
The dimensions cannot be modified==> we are seraching for materials with good corrosion properties, higher young modulus and if possible correct machining response.
Every advice will be welcome
The dimensions cannot be modified==> we are seraching for materials with good corrosion properties, higher young modulus and if possible correct machining response.
Every advice will be welcome





RE: Which material with high stiffness and good corrosion resistance?
RE: Which material with high stiffness and good corrosion resistance?
The 2205 should be a good bet as long as you don't get it hot, nothing over 600F.
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Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: Which material with high stiffness and good corrosion resistance?
I would prefer a material with a higher young modulus because I think the yield stress of our 316L is already good (Ø 0.8mm)
Could you please tell me where I can find mechanical caracteristics of 2205 to compare with.
RE: Which material with high stiffness and good corrosion resistance?
UNS S32550: TS 110 ksi min. YS 80 ksi min
316L: TS 75ksi min. YS 25 ksi min.
A very modest increase in Modulus but large increase in strength can be achieved with Inconel Alloy 718 at appreciable added cost.
If you need greater Modulus , alloy groups outside ferrous or nickel based will be required - at very high cost.
RE: Which material with high stiffness and good corrosion resistance?
Maui
RE: Which material with high stiffness and good corrosion resistance?
RE: Which material with high stiffness and good corrosion resistance?
Concerning the young modulus, where can I find a comparative table of a wide variety of alloys?
RE: Which material with high stiffness and good corrosion resistance?
To better help us to help you, what are the design parameters for this piston? What is the corrosive environment?
ASM Handbooks have much info on Young's Modulus for a variety of materials. Manufacturers like Carpenter have considerable information for the alloys, which they manufacture, on their web sites.
RE: Which material with high stiffness and good corrosion resistance?
RE: Which material with high stiffness and good corrosion resistance?
TTFN
RE: Which material with high stiffness and good corrosion resistance?
RE: Which material with high stiffness and good corrosion resistance?
For really high $$$ and high Modulus and corrosion resistance, why not Osmium?
RE: Which material with high stiffness and good corrosion resistance?
But for the ultimate $$$$$ and highest modulus and ultimate corrosion resistance-Diamond.
Actually a CVD diamond or diamond like coating would give another high modulus material an almost chemically inert surface-perhaps not unrealistic for a 0.8 mm piston.
RE: Which material with high stiffness and good corrosion resistance?
(I have some cantilever beam test samples that are much stiffer than comparable steel beams due to a TiN coating.)
RE: Which material with high stiffness and good corrosion resistance?
An other problem could be the bad behaviour of such a hard coating against possible shocks.
RE: Which material with high stiffness and good corrosion resistance?
I havent done anything quantitative with this info, there was some push originally to investigate fatigue life performance of TiN stiffened thin beams, but production work has pushed that to the side.
nick
RE: Which material with high stiffness and good corrosion resistance?
If you have parts bending (yielding) that is because the strength is too low, not the modulus. There are a lot of good options at much higher strengths. You have selected about the softest iron based alloy around.
If the parts are flexing too much (but not yielding) then higher modulus will help. The highest stiffness engeneering materials that I have worked with are tungsten carbides and ceramics (SiC).
= = = = = = = = = = = = = = = = = = = =
Corrosion never sleeps, but it can be managed.
http://www.trenttube.com/Trent/tech_form.htm
RE: Which material with high stiffness and good corrosion resistance?