where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -
2395 views
Technical Discussions
Lanh Huyet
NDT Inspector,
Vietnam, Joined Jun 2013, 25

Lanh Huyet

NDT Inspector,
Vietnam,
Joined Jun 2013
25
08:00 Jul-03-2013
Grain size 11Cr2Ni

Can anybody help me to find out the grain size of stell 11Cr2Ni.
Thanks for any help.

 
 Reply 
 
Ed T.
Other, ASNT Level III, UT, RT, MT, PT, VT
NDT Level III, Saudi Arabia, Joined Sep 2011, 169

Ed T.

Other, ASNT Level III, UT, RT, MT, PT, VT
NDT Level III,
Saudi Arabia,
Joined Sep 2011
169
08:15 Jul-03-2013
Re: Grain size 11Cr2Ni
In Reply to Lanh Huyet at 08:00 Jul-03-2013 (Opening).

Try Acid Etch with a mild acid solution.

 
 Reply 
 
lanh Huyet
NDT Inspector,
Vietnam, Joined Jun 2013, 25

lanh Huyet

NDT Inspector,
Vietnam,
Joined Jun 2013
25
08:40 Jul-03-2013
Re: Grain size 11Cr2Ni
In Reply to Ed T. at 08:15 Jul-03-2013 .

It's seem that you don't understand my question,Ed.
As I know, We can perform UT when the grain size in steel< 10 wave length.So,I need to know the grain size of 11Cr2Ni.

 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
12:30 Jul-03-2013
Re: Grain size 11Cr2Ni
In Reply to lanh Huyet at 08:40 Jul-03-2013 .

Use a lower frequency probe to accomplish UT on coarse-grained materials. If its a weld then you may need to use twin crystal longitudinal wave angle probes to penetrate the columnar grain structure.

 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1286

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1286
14:33 Jul-03-2013
Re: Grain size 11Cr2Ni
In Reply to lanh Huyet at 08:40 Jul-03-2013 .

Lanh, I think Ed T. was suggesting that you could determine the grain size by actually looking at the sample after it is polished and etched. The only thing published material will give you is an approximate range for the processed metal. If you are doing a weld inspection the grain size is not easily predicted since it will be a function of the welding heat input parameters...you will need to actually put a probe to the metal and find out for yourself if it can be tested. There is no text-book way around it.

 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1286

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1286
15:20 Jul-03-2013
Re: Grain size 11Cr2Ni
In Reply to Nigel Armstrong at 12:30 Jul-03-2013 .

Nigel, this may be a separate topic but since you recommended it...I have long been curious about how a "twin-crystal" L-wave angle beam probe gets a reputation as being a superior solution to inspecting coarse-grained materials. How is it superior to a monoelement probe with the same incident angle? When I do a Civa model of the conditions there is no improvement and I have the added limitation with a twin crystal that it is only providing a maximum returned signal if the target occurs at the Tx-Rx centre of beam crossing points. Length sizing with a twin crystal probe is significantly greater than with a monoelement probe. For the same size probe the elements in the twin are effectively half the width of a monoelement so we might even expect slightly less pressure at the same transmitted soundpath. When I actually place a probe on steel and use a SDH target, the only difference I see is the entry noise is greater with the monoelement probe. And although I can find a SDH at a depth where both have the same sensitivity, moving to a greater depth the twin element probe sensitivity quickly drops off compared to the monoelement.

1
 
 Reply 
 
Rick Lopez
R & D,
John Deere - Moline Technology Innovation Center, USA, Joined Jul 2011, 190

Rick Lopez

R & D,
John Deere - Moline Technology Innovation Center,
USA,
Joined Jul 2011
190
15:22 Jul-03-2013
Re: Grain size 11Cr2Ni
In Reply to lanh Huyet at 08:40 Jul-03-2013 .

Grain size can only be determined destructively (as mentioned by former and latter Eds). An example document to follow for destructive metallography would be ASTM E112.

 
 Reply 
 
Carlos Correia
R & D, - -
UCV & EGROUP, Venezuela, Joined Oct 2008, 120

Carlos Correia

R & D, - -
UCV & EGROUP,
Venezuela,
Joined Oct 2008
120
05:07 Jul-04-2013
Re: Grain size 11Cr2Ni
In Reply to Rick Lopez at 15:22 Jul-03-2013 .

Some contribution to this interesting Nigel and Ed posts, and Sorry if I am wrong but It seems that dual element transducers were created to explore a specific zone of the material, at a particular depth, for defects with a particular geometry and a particular orientation. For example if a component always show the same type of cracking, and the crack occurs at specific well known zone, dual transducers could be design with the proper roof angle to have this type of “focusing effect(?)” at the proper sound path to improve the signal amplitude from reflectors at this distance. I think that for good detection using dual is preferable a planar reflector who rest in a well oriented plane, the geometry and orientation of the reflector and his relation with external geometrical restrictions as weld crown, could make the dual transducer less sensitive compared with a mono-transmitter-receiver element or a very good option, but it is important to remember that each dual L-transducers with an specific roof angle are linked with an specific depth in the material.

 
 Reply 
 

Product Spotlight

Conformable wedge transducer

The conformability is obtained with a flexible membrane filled with water between the transducer and
...
the inspected component. The coupling between the membrane and the component requires a small quantity of water or couplant. The conformable wedge combines the acoustic performance of immersion technique with good coupling and low attenuation.
>

Panther

M2M PANTHER is a phased-array equipment designed for both desktop and industrial applications, offer
...
ing unparalleled performance in a compact unit. It combines the speed required for industrial integrated Phased-Array Ultrasound (PAUT) solutions, with the most complete set of total focusing method (TFM) imaging techniques, making it the ultimate tool for R&D and procedure qualification.
>

FD800 Bench Top Flaw Detectors

The bench-top FD800 flaw detector range combines state-of-the-art flaw detection with advanced mater
...
ial thickness capabilities. Designed for use in the laboratory these gauges are the tool you need for all your flaw detecting needs.
>

MUSE Mobile Ultrasonic Equipment

The MUSE, a portable ultrasonic imaging system, was developed for in-field inspections of light-weig
...
ht structures. The MUSE consists of a motor-driven manipulator, a water circulation system for the acoustic coupling and a portable ultrasonic flaw detector (USPC 3010). The MUSE provides images of internal defects (A-, B-,C- and D-scan).
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window