Heat treatment impact on defect

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Zakaria ghrab

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Nov 24, 2016, 10:20:02 PM11/24/16
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Dear expert,

  Could you please give us your feedback & return experience about impact of PWHT (Heat treatment in general) in defect.

Could  size of porosity (volumic defects) can change after PWHT especially for ally steels ?
Any information for surfacic defects ?

Could you please confirm and give us some reference from codes and/or litterature.

Thank you very much.

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زكرياء غراب
GHRAB Zakaria 
Tunisia : +216 96 635 805

Yesterday is the past, tomorrow is the future; and today? Today is the present, the gift: Enjoy it!

George Dilintas

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Nov 27, 2016, 9:46:08 PM11/27/16
to Meghanadh K
Not at all unless you "burn" it

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Dr. Georgios Dilintas,
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Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

Zakaria ghrab

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Nov 28, 2016, 4:58:05 AM11/28/16
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In that case what'is the  advantage to perform NDE after PWHT.

Thank you.


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Alan Denney

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Nov 28, 2016, 5:38:47 AM11/28/16
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PWHT can open up lack of fusion defects which were held closed prior to PWHT by the residual stresses (and were transparent to UT).

Final acceptance is based on the article in its finished condition. NDT before PWHT is carried out so that repairs on the defects detected at that stage are cleared at that stage.

 

Alan Denney

AKD Materials Consulting Ltd

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Dr. Georgios Dilintas,

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Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

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زكرياء غراب
GHRAB Zakaria 

Tunisia : +216 96 635 805

Yesterday is the past, tomorrow is the future; and today? Today is the present, the gift: Enjoy it!

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George Dilintas

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Nov 28, 2016, 6:28:35 AM11/28/16
to Meghanadh K
residual stresses are usually tensile stresses. This would be the case when residual stresses were compressive ones.

2016-11-28 12:32 GMT+02:00 Alan Denney <al...@denney1.freeserve.co.uk>:

PWHT can open up lack of fusion defects which were held closed prior to PWHT by the residual stresses (and were transparent to UT).

Final acceptance is based on the article in its finished condition. NDT before PWHT is carried out so that repairs on the defects detected at that stage are cleared at that stage.

 

Alan Denney

AKD Materials Consulting Ltd

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Dipl. Ing. In Aeronautic and Space Engineering

Ph.D in Mechanics of Solids - Computational Mechanics

A.I.S, A.N.I, IRCA Lead Auditor

Welding, Stress Analysis, Corrosion, QA/QC, Failure Analysis, Risk Analysis

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Thanks and Regards, ?

-----

زكرياء غراب
GHRAB Zakaria 

Tunisia : +216 96 635 805

Yesterday is the past, tomorrow is the future; and today? Today is the present, the gift: Enjoy it!

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