MAR-M

[JAMMAN]

Has anyone worked with mar-m or know of an american foundry that deals with casting it or...

 

has anyone even heard of it?

 

A web search turned up very little and most of the places were on the other side of the earth.

[JAMMAN]

So I can assume no mastercammers have heard of this material.

[lynnz]

Jamman,

Don't know much about it but located some info on this material at the link below. Sounds like some tough stuff.

 

http://www.suppliersonline.com/propertypages/marm918.asp

 

lynnz

[JAMMAN]

It is tough stuff that's why I'd like to use it for the turbine wheels in our next generation of pro stock turbo's.

 

Thanks for the link!

[Wally]

Grain boundary etch for a Nickel based alloy tradename Mar M 002

[Wally]

The material composition is

Ni Bal

Co 5.0

Cr 8.5

W 9.5

Al 5.5

Ti 2.2

Ta 2.8

C 0.02

[crazy^millman]

Well I know some foundaries but not sure if they deal with this stuff or not. I am thinking you might be looking at something like a forging verse a Casting. Here is a company I have used in the past for crazy stuff.

 

Specality Steel & Forge

26 Law Drive

Fairfeild, NJ 07004

1-201-808-8300

www.steelforge.com

 

And for you guys looking for exotic stuff here is a good contact also.

 

Admiral Steel

4152 West 123rd Street

Alsip, Illinos 60803

1-800-323-7055

www.admiralsteel.com

 

They have Damascus as well as other knife blade Steel.

HTH

[JAMMAN]

Cool, I'll check it out for real.

[?Mark]

Bringing this thread back from the depths of emastercam archives...

Looking at a large project involving this MAR M material... blade/turbine kind of work.

Anyone with the experience of successfully cutting it?

Any tips/tricks that can be shared will be greatly appreciated.

 

TIA

[Greg_J]

What is the ending designation?

MAR M-247? 246, 509 ,302

I'm trying to compare it to a Nickel Super alloy we work with.

How hard is it?

[?Mark]

Info about any of those would be great, but this one is a 247 series.

Lots of 5 axis milling with small dia end mills.

[Greg_J]

The nickel content of Mar-M 247 is way higher than the material I've been working with, it also has tungsten in it.

So it's not quite the same beast that I've been dealing with it looks much worse.

 

80-125 SFPM .010 FPT .10 RDOC - Rough Turning my best guess.

80-125 SFPM .005-.008 FPT .03 DOC (DEPENDS ON THE SIZE)

10% Coolant concentration.

Give ceramics a try we have had great success.

[Colin Gilchrist]

On 4/14/2021 at 7:02 PM, ?Mark said:

Info about any of those would be great, but this one is a 247 series.

Lots of 5 axis milling with small dia end mills.

OSG

Ceramic Endmills > 6, 8, 10, 12 mm

https://www.osg.co.jp/en/products/endmill/index.html

But, they are not cheap!!!

 

 

[crazy^millman]

On 4/16/2021 at 10:55 AM, Colin Gilchrist said:

OSG

Ceramic Endmills > 6, 8, 10, 12 mm

https://www.osg.co.jp/en/products/endmill/index.html

But, they are not cheap!!!

 

 

Where you have to understand shop rate and ROI processes to understand what are the gains with using tools like this. Shop rate of $60/hr probably not going to see an advantage using these tools. Shop rate of $475/hr going to see it real quick.

[Colin Gilchrist]

They are scary to use. Because they run above 700 C.  to soften the material. An Operator sees the tool and material glowing, and wants to turn down the feed, and "pop", there goes several hundred dollars...

[crazy^millman]

1 minute ago, Colin Gilchrist said:

They are scary to use. Because they run above 700 C.  to soften the material. An Operator sees the tool and material glowing, and wants to turn down the feed, and "pop", there goes several hundred dollars...

Some of the parts we make programs for cannot get that hot due to stress issues. They are strictly forbidden due to part failures of past parts where that happened. 50-60 year legacy on things makes some companies weary of even rethinking using tools like this. Can only image getting HST toolpaths used on this material. That has only taken 3 years to finally get a test going.

On the machine broaching was a fun conversation with flight directors, heads of engineering and other groups. Made the test part and when they put it all together I get the strange looks and begin ask how did you do that? I was not sure what they meant and they asked about the finished height. I told them I could only hit it with a 1/4 turn of the thread. They went yeah you said that, but hit them with .001" of the nominal. Is that a problem? No, but how? I will take dumb luck any day of the week if that is a good enough answer for you.

[Colin Gilchrist]

Just smile, and say "the four P's".

Proper Preparation = Perfect Performance.

[huskermcdoogle]

2 hours ago, Colin Gilchrist said:

Just smile, and say "the four P's".

Proper Preparation = Perfect Performance.

Or you could look at it as the 7 P's   

Proper Planning and Preparation Prevent Pi$$ Poor Performance