Re: Re: [MW:28673] Deformation during PWHT - P92

Implications found with several facts from TWI not just one, it wasnt highlighted for microstructure implications, but with other metallurgical factors, yes as hardness was within limit poor microstructure has nothing to do with failure.

How about, below implications from TWI?

Another issue to be careful of is hydrogen control. A high strength weld metal may not be able to tolerate hydrogen introduced by welding over it with a high hydrogen consumable.

In addition to metallurgical factors, it is worth bearing in mind that an existing weld is more likely than parent material to contain defects, such as fabrication flaws or cracking from service. Defects which are welded over, and not melted out, can suffer locally intensified strain age embrittlement by static or dynamic strain ageing at the region of concentrated strain???

 Thanks,

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From: George Dilintas

Date: 2018-11-23 00:42

To: materials-welding

Subject: Re: [MW:28660] Deformation during PWHT - P92

The allowable stress at this temperature is much lower that in the operating temperature. You were in the creep range and most propably the pipe was not well supported. So permanent plastic deformation occured. 

The hardness was good because the pwht were most propably correct.

The deformation in that case had nothing to do with the micro structure 

Στις Τρί, 6 Νοε 2018, 08:53 ο χρήστης José Luís Ferreira <Jluis.nf@gmail.com> έγραψε:

After the PWHT it was observed that along the side of the weld a deformation appeared as a collapsed pipe (see figure). After the PWHT were performed hardness test (ICU) and PAUT. All tests were accepted.

The main hypothesis about the causes of the occurrence is related to the thermal expansion constraint (due to heavy equipment and fixation devices).

PWHT Parameters:

Temp. 760 ° C

Time: 2h

Thickness: 15.1mm

Material: A335 Gr.P92

Position: vertical (tube)

Has anyone seen this? What can happen to the mechanical properties of this material? Some bibliographical references that follow. indicate to follow for an opinion?

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