Abstract
Two X70 pipeline steel plates with different finishing cooling temperature showed different DWTT indexes. In order to investigate the influences of microstructure and texture on toughness EBSD and X-ray were employed. Plates with lower toughness had higher low angle boundary proportion than the other, which is different from the previous research. Then the macro textures of the two plates were obtained by the X-ray diffractometer. It was shown that the ‹110›//ND were dominant in both of the two plates. The effects of several components on the toughness were analyzed. This work shows that the {112}‹110› component is the favorable texture benefiting the toughness. ‹111›//ND has direct influence on the yield stress and toughness.
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