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Sonatest Ltd
From our three distinct business centres in the UK, USA and CANADA, Sonatest design and produce a leading range of high performance ultrasonic NDT equipment and accessories.

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Technical Discussions

Jean-Pascal Reymondin

06:50 Feb-13-2004
Detection of small nonmetallic inclusion

Does anybody know how to detect small non metalic inclusion ( 0,010 mm to 0,020 mm ) into steel ( X51CrMo3 or X51CrMoV5-1 ).
Steel thickness 0,5 mm
Détection on the surface and in the volume.

Thank you

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Jim Kovarik

06:19 Feb-19-2004
Re: Detection of small nonmetallic inclusion ----------- Start Original Message -----------
: Does anybody know how to detect small non metalic inclusion ( 0,010 mm to 0,020 mm ) into steel ( X51CrMo3 or X51CrMoV5-1 ).
: Steel thickness 0,5 mm
: Détection on the surface and in the volume.
: Thank you
------------ End Original Message ------------

A radiographic linear array system should be able to detect these indications.
Lixi Inc. has some experience with these systems. Their website is www.lixi.com

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Francois Blanchard

06:27 Feb-19-2004
Re: Detection of small nonmetallic inclusion ----------- Start Original Message -----------
: Does anybody know how to detect small non metalic inclusion ( 0,010 mm to 0,020 mm ) into steel ( X51CrMo3 or X51CrMoV5-1 ).
: Steel thickness 0,5 mm
: Détection on the surface and in the volume.
: Thank you
------------ End Original Message ------------

You can also investigate the possibility of a laser ultrasonic system. Expensive but able to detect high frequency ultrasound. (www.tecnar.com) With Ghz ultrasound, I was able to measured thickness foil down to 10um.
regards,
Francois

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John Pursley
R & D
Envision Product Design, USA, Joined Oct 1999,

²³

John Pursley
R & D
Envision Product Design,
USA,
Joined Oct 1999

²³

00:06 Feb-20-2004
Re: Detection of small nonmetallic inclusion Envision's high resolution digital X-ray panels and linear arrays along with a micro-focus source will image your inclusions in the 10 to 20 micron range. http://cmosxray.com

----------- Start Original Message -----------
: : Does anybody know how to detect small non metalic inclusion ( 0,010 mm to 0,020 mm ) into steel ( X51CrMo3 or X51CrMoV5-1 ).
: : Steel thickness 0,5 mm
: : Détection on the surface and in the volume.
: : Thank you
: You can also investigate the possibility of a laser ultrasonic system. Expensive but able to detect high frequency ultrasound. (www.tecnar.com) With Ghz ultrasound, I was able to measured thickness foil down to 10um.
: regards,
: Francois
------------ End Original Message ------------

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rizal

01:03 Feb-24-2004
Re: Detection of small nonmetallic inclusion please comment and give some tips about my research.. topic:
Investigation of crack defect in roof clay product using ultrasonic
machine
thanks alot..

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Zhong Soo Lim

01:40 Apr-15-2004
Re: Detection of small nonmetallic inclusion ----------- Start Original Message -----------
: Does anybody know how to detect small non metalic inclusion ( 0,010 mm to 0,020 mm ) into steel ( X51CrMo3 or X51CrMoV5-1 ).
: Steel thickness 0,5 mm
: Détection on the surface and in the volume.
: Thank you
------------ End Original Message ------------

Magnetic Leakage Flux method can be one of the possible candidates, which is good since it is a noncontact method, and no couplant is needed.
I have done a similar research, which is very easy to apply.
The detectivity of the nonmetallic inclusion can be down to 1x10^(-4) mm^(3), or better than that in some cases.
There can be some limitations.

1. Surface condition
2. Uniformity of the inner material structure

The thickness of 0.5 mm can be a problem.
But you can access from both sides (top and bottom).

If you have any question, then we can discuss further.

Zhong Soo Lim

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