The relationship between the microstructure and toughness of welding heat-affected zone in Z80 grade pipeline steels is studied. It is found that the intercritical reheated coarse-grained heat-affected zone (ICCGHAZ) of experimental steels has the lowest toughness values when the secondary peak temperature is at intercritical (α +γ) region during multi-pass welding. The local embrittlement is mainly attributed to the morphology, amount and size of M-A constituent. It is also found that the microstructural inhabitance at ICCGHAZ has a deleterious effect on the toughness. On the basis of above experimental results, it is suggested that the local embrittlement should be prevented by using pre-heating thermal cycle which could eliminate the microstructural inhabitance and using post-heating thermal cycle which could improve the morphology, amount and size of M-A constituent.


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    Title :

    Study on local embrittlement of welding heat-affected zone in X80 pipeline steels


    Contributors:
    Shiying, Hao (author) / Gao, Huilin (author) / Zhang, Xiaoyong (author) / Yong, Zhou (author)

    Published in:

    China Welding ; 20 , 2 ; 36-40


    Publication date :

    2011


    Size :

    5 Seiten, 8 Bilder, 2 Tabellen, 5 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English