Abstract:In order to clarify the influence of common alloying elements on high heat input welding coarse-grained heat affected zone(CGHAZ) in steel,experimental steels containing different alloy mass percent were designed and treated by oxide metallurgy process. Impact toughness and microstructural characteristics of simulated welding CGHAZ of each steel were researched. Results showed that low C and high Mn is in favor of toughness improvement,but there exists a proper range of C mass percent. Grain boundary ferrite needs to be inhibited when C mass percent is ultra low. Relatively high CGHAZ toughness could be obtained with 0.01% Nb addition. However,excessive Nb will cause bainite formation and toughness deterioration. A percentage of 0.05% of V addition could increase matrix strength and keep good CGHAZ toughness,while a larger amount will impair toughness because of carbide precipitation. Increase of Ni-Cu mass percent in a proper range can improve combined properties of strength and CGHAZ toughness. Addition of Cr and Mo can prohibit grain boundary transforming product and promote the formation of fine acicular ferrite. However,CGHAZ toughness had not been improved effectively because of a large amount of M/A formation for the present steel composition.
王 超,娄号南,王丙兴,王昭东,王国栋. 合金元素对大线能量焊接用钢组织性能的影响[J]. , 2018, 53(6): 85-91.
WANG Chao,LOU Hao-nan,WANG Bing-xing,WANG Zhao-dong,WANG Guo-dong. Effect of alloying elements on microstructure and properties of high heat input welding steel. Iron and Steel, 2018, 53(6): 85-91.