Abstract
Experimental methods, such as OM, SEM and X-EDS, were used to study the transverse cracks appeared on the external arc of tensile region during pipe bending. The pipe line steel consists of acicular ferrite (AF) and granular bainite (GB) with good mechanical properties. Copper phase enrichment occurs at prior austenite grain boundaries near the cracks of bend pipe, which is the main reason for the surface cracks. In order to decrease the cracks ratio, the microstructure evolution and stress state during the bending process need to be researched deeply.
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