Dear sir,in my project i want to inspect the aisi stainless steel casting components by using phased array ultrasonic testing technique which is an advanced technique among non destructive testing techniques to find the defects in the material.in this material i want to detect the defects on them.but the major disturbance is attenuation loss and scattering noise is occurred during the inspection due to their coarse grain structure.how to overcome this problem,and how to detect the defects in the material.instruct me.
What kind of defects are you looking for? What phased array equipment do you have access to? Have you looked at Full Matrix Capture and The Total Focussing Method?
Main preparation for a UT test always includes the selection of excitation wavelength. It depends on how small the defect you want to detect and how small the grain size is. Low frequency excitation will decrease the overall attenuation but also the detectability. High frequency excitation will increase both. Therefore, you have to make a smart selection based on the UT sensors you can find.
Kumar,
I found the following webinar by Olympus which may be helpful to you. It gives a general idea on what you are working on. You can register for free if you are interested:
http://www.business-review-webinars.com/webinar/Energy/Phased_Array_Inspection_of_Difficult_Materials-j34QMTWh/register
UT inspection of Cast SS304 is difficult because ,as you have indicated, their coarse grain microstructure. It depends on many factors, the most important being the defect size, types, part thickness, etc. You may have to do actual trials. Some people only look at attenuation differences to assess the quality of these structures.
UT inspection of cast SS 304 is difficult. But from my experience you can try annealing the sample as it refine the grains and then do UT.
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