Effect of the tempering cooling rate on the toughness of bainite welds

CAI Zhipeng; WANG Liang; PAN Jiluan; QIAO Shangfei; HUO Xin; WANG Peng; LIU Xia

doi:10.16511/j.cnki.qhdxxb.2015.22.002

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Journal of Tsinghua University(Science and Technology) ›› 2015, Vol. 55 ›› Issue (10) : 1045-1050. DOI: 10.16511/j.cnki.qhdxxb.2015.22.002

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Effect of the tempering cooling rate on the toughness of bainite welds

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Abstract

Large components with thick walls have slow cooling rates during tempering. Improper tempering parameters can cause temper brittlement in CrMoV steels. The effect of tempering cooling rate on the toughness of bainite welds is investigated for thick circular components. Slow tempering cooling rates reduce the weld toughness. Multi-layer, multi-pass welds experience layered brittle fracture, which illustrates that slow tempering cooling rates affect only local welds with the greatest toughness reduction in the heat affected zone (HAZ) between the layers. Auger electron spectroscopy (AES) analyses show that the segregation of C, O and Ni along the prior austenite grain boundaries is associated with the toughness reduction.

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multi-layer, multi-pass welding / toughness reduction / element segregation / large thick wall component

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CAI Zhipeng, WANG Liang, PAN Jiluan, QIAO Shangfei, HUO Xin, WANG Peng, LIU Xia. Effect of the tempering cooling rate on the toughness of bainite welds[J]. Journal of Tsinghua University(Science and Technology). 2015, 55(10): 1045-1050 https://doi.org/10.16511/j.cnki.qhdxxb.2015.22.002

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