Effect of nickel and molybdenum additions on weld metal toughness in a submerged arc welded HSLA line-pipe steel
Effect of nickel and molybdenum additions on weld metal toughness in a submerged arc welded HSLA line-pipe steel
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DOI：
10.1016/j.jmatprotec.2005.10.028
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发表时间：
2006-03-30
影响因子：
6.3
通讯作者：
Liu, C
中科院分区：
文献类型：
--
作者：
Bhole, SD;Nemade, JB;Liu, C
在实验室条件下，研究了镍（Ni）、钼（Mo）以及Ni和Mo复合添加对API HSLA-70钢埋弧焊冲击韧性的影响，并讨论了影响冲击韧性的微观组织因素。镍的添加导致低的冲击韧性和增加的焊缝金属（WM）中的断裂外观转变温度（FATT）。Ni的上述影响应归因于通过增加Ni含量抑制针状铁素体（AF）的形成。相反，在WM中的Ni和Mo的组合存在降低了晶界铁素体（GBF）的体积分数，并促进形成高韧性的AF。Mo含量的增加产生了针状铁素体为主的焊缝金属显微组织，具有显著改善的韧性。添加0.881重量%的Mo在WM中，在-45 ° C下具有77% AF和20%粒状贝氏体（GB）的显微组织的最佳冲击韧性。(c)2005 Elsevier B. V.保留所有权利。
The effects of alloy additions of nickel (Ni), molybdenum (Mo), and Ni and Mo together on the impact toughness of an API HSLA-70 steel by submerged arc welding in the laboratory were investigated and micro-structural factors which affect the impact toughness were discussed. Ni additions resulted in a low impact toughness and an increased fracture appearance transition temperature (FATT) in weld metal (WM). The above influences of Ni should be attributed to the formation of acicular ferrite (AF) suppressed by increasing the Ni content. Conversely, the combined presence of Ni and Mo in the WM decreased the volume fractions of grain-boundary ferrite (GBF) and promoted formation of high toughness of AF The increase of Mo content created an acicular ferrite-predominant weld metal microstructure with impressively improved toughness. Mo addition of 0.881 wt.% in the WM gave the optimal impact toughness at -45 degrees C with a microstructure of 77% AF and 20% granular bainite (GB). (c) 2005 Elsevier B.V. All rights reserved.