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- since 1996 -
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Technical Discussions
Ken Meinert
Applied Research Lab - Penn State University, USA, Joined May 2011, 1

Ken Meinert

Applied Research Lab - Penn State University,
USA,
Joined May 2011
1
15:40 May-20-2011
Methods to Detect 0.005" Porosity in Titanium

We are developing a process to repair worn tips on titanium (Ti-6Al-4V) compressor blades. The sponsor has requested that we determine NDT method(s) that can be used to detect internal porosity 0.005" (at 90% probability, with 95% confidence) in those repairs.

Looking to determine which NDT methods (and suppliers) that would be able to detect such flaws.

 
 Reply 
 
hoi nagi
hoi nagi
17:08 May-31-2011
Re: Methods to Detect 0.005" Porosity in Titanium
In Reply to Ken Meinert at 15:40 May-20-2011 (Opening).

If the thickness of the blade is fairly thin (3mm-5mm, i recommend using a high frequency ultrasonic transducer. between 15-25MHZ and small crystal diameter, this way you can get the most sensitivity and resolution.

or depending on the size of this blades and thickness a magnetic particle wet bench might show you something.

good luck

 
 Reply 
 
Wieslaw Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 262

Wieslaw Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
262
17:37 May-31-2011
Re: Methods to Detect 0.005" Porosity in Titanium
In Reply to Ken Meinert at 15:40 May-20-2011 (Opening).

You should measure the scattering of sound waves, this is always the best measurement of porosity and granulity.

With a simple setup, allowing the measurement of waves, scattered under some angles and some suitable calculations you can measure thestatistical distribution of porosity. The best suitable frequency can be about 5MHz, if the porosity is in the region of about 0.1mm (0.005").

 
 Reply 
 
Lalit Mohan Kothari
Consultant, -
On ..IOCL and BARC(Bhabha Atomic Research Centre).etc, India, Joined Jan 2003, 128

Lalit Mohan Kothari

Consultant, -
On ..IOCL and BARC(Bhabha Atomic Research Centre).etc,
India,
Joined Jan 2003
128
19:43 Jun-21-2011
Re: Methods to Detect 0.005" Porosity in Titanium
In Reply to Ken Meinert at 15:40 May-20-2011 (Opening).

Ken,
For thin object only UT echoes pattern is helpful and frequency is depend upon your sensitivity.

Thanks & Regard

 
 Reply 
 
Kevin Paul Humphreys
NDT Inspector,
ALS, Australia, Joined Jun 2011, 13

Kevin Paul Humphreys

NDT Inspector,
ALS,
Australia,
Joined Jun 2011
13
02:19 Jun-22-2011
Re: Methods to Detect 0.005" Porosity in Titanium
In Reply to Ken Meinert at 15:40 May-20-2011 (Opening).

Ken,
It may be worth looking at some high tech xray solution like the one mentioned at link below.
As an ultrasonic operator the problem with using ultrasonics on an irregular shape is getting consistent contact to get accurate sizing

http://www.sciencedirect.com/science/article/pii/0308912677900189

 
 Reply 
 

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