Effect of single pass welding heat input on microstructure and hardness of submerged arc welded high strength low carbon bainitic steel
Effect of single pass welding heat input on microstructure and hardness of submerged arc welded high strength low carbon bainitic steel
复制标题
单道焊接热输入对埋弧焊高强度低碳贝氏体钢组织和硬度的影响
DOI：
10.1179/1362171812y.0000000048
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发表时间：
2012-10-01
影响因子：
3.3
通讯作者：
Du, L. X.
中科院分区：
文献类型：
--
作者：
Lan, L. Y.;Qiu, C. L.;Du, L. X.
采用平板堆焊试验方法，研究了单道焊热输入对高强度贝氏体钢埋弧焊组织和硬度的影响。无论热输入如何，焊缝金属组织中都含有很高的针状铁素体体积分数。相反，随着热输入的增加，粗晶热影响区(HAZ)的主要组织从板条马氏体和铁素体侧板的混合体转变为完全的铁素体侧板。显微硬度测试表明，在低热输入条件下，粗晶HAZ处硬度最大，为避免焊接冷裂纹的形成，实验钢的最小热输入应大于0.92kJ mm−1。对于所有的热输入，焊缝金属中复杂夹杂物的尺寸分布非常相似，主要是因为较短的停留时间不会使夹杂物迅速长大。
The bead on plate test method was employed to investigate the effect of single pass welding heat input on microstructure and hardness of submerged arc welded high strength bainitic steel. The weld metal microstructure contains very high volume fraction of acicular ferrite regardless of heat input. By contrast, with the increase in heat input, the main microstructure in coarse grained heat affected zone (HAZ) changes from a mixture of lath martensite and ferrite sideplate to full ferrite sideplate. Microhardness measurement showed that maximum hardness values always present at the coarse grained HAZ under lower heat input condition, which indicates that the minimum heat input of experimental steel should be higher than 0·92 kJ mm−1 to avoid the formation of welding cold crack. The size distributions of complex inclusions in the weld metal are very similar for all heat inputs mainly because the short residence time does not make the inclusion grow rapidly.