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.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    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




    3D cohesive modelling of hydrogen embrittlement in the heat affected zone of an X70 pipeline steel

    Alvaro, Antonio / Olden, Vigdis / Akselsen, Odd Magne | Tema Archive | 2013


    Hydrogen embrittlement of high strength pipeline steels

    Hardie, D. / Charles, E.A. / Lopez, A.H. | Tema Archive | 2006


    3D cohesive modelling of hydrogen embrittlement in the heat affected zone of an X70 pipeline steel – Part II

    Alvaro, Antonio / Olden, Vigdis / Akselsen, Odd Magne | Tema Archive | 2014


    Transformation behavior of heat-affected zone during underwater wet welding

    Kinugawa, J. / Fukushima, S. / Fukushima, T. | Tema Archive | 1979


    Heat-affected-zone toughness of welded joints in micro-alloy steels

    Rothwell, A. B. ;White, D. W. G. | TIBKAT | 1979