RE: [MW:18068] RE: 18041] metallurgy of weld joint PWHT

Dear all.,

First of all I would like to thank Goswami sir for his replies., whenever I posted my queries I have got his replies and study materials.

I have gone through all replies and some sites in web and I think both P.Goswami sir and Ramin kondari sir are right in this regard. Here am trying to conclude the matter as given below. Please correct me if I'm wrong.,

1.due to sudden cooling austenite couldn't change to ferrite and forms unstabled or distorted martensite.

2.atoms in the distorted martensite creates the stress in the haz and weld.,which we call residual stress.

3. During pwht, atoms of unstable martensite regain or rearrange its location and form tempered or stabled martensite and reduces the stress up to some level. But there is no phase change or microstructual change.

Please send your feedback.

Sandeep.M.V

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