研究了焊接贝氏体-奥氏体钢管贝氏体钢侧显微组织变化和残余应力分布对巴克豪森噪声（BN）的影响。
The effects of change in microstructure and residual stress distribution on Barkhausen noise (BN) on the bainitic steel side in a welded bainitic and austenitic steel pipe are studied.
SS400的显微组织为铁素体、珠光体和少量的贝氏体。
The microstructures of super-steel SS400 were composed of ferrite, the pearlite and small amount of bainite.
X100管线钢的显微组织以粒状贝氏体为主，同时弥散分布着大量细小的M/A岛和少量的板条贝氏体；
Moreover, the microstructure of X100 pipeline steel mainly consists of massive granular bainite, and some fine and dispersive M/A islands with a few lath bainite in the matrix also.
随着冷却速率的增加，实验钢的显微组织由铁素体+粒状贝氏体逐步转变为板条贝氏体+板条马氏体及板条马氏体组织；
The microstructure of the steel transforms from ferrite plus granular bainite, lath bainite plus lath martensite and then to lath martensite successively with the increasing of cooling rate;
随着冷却速率的增加，实验钢的显微组织由铁素体+粒状贝氏体逐步转变为板条贝氏体+板条马氏体及板条马氏体组织；
The microstructure of the steel transforms from ferrite plus granular bainite, lath bainite plus lath martensite and then to lath martensite successively with the increasing of cooling rate;
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