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首页> 外文期刊>Science and Technology of Welding & Joining >Effect of single pass welding heat input on microstructure and hardness of submerged arc welded high strength low carbon bainitic steel
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Effect of single pass welding heat input on microstructure and hardness of submerged arc welded high strength low carbon bainitic steel

机译：单道次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

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摘要

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.
机译：采用平板焊道试验方法研究了单道次焊接热输入对埋弧焊高强度贝氏体钢组织和硬度的影响。焊接金属的微观结构包含非常高的针状铁素体体积分数，而与热量输入无关。相比之下，随着热量输入的增加，粗粒热影响区（HAZ）的主要微观结构从板条马氏体和铁素体侧板的混合物变为全铁素体侧板。显微硬度测量表明，在较低的热输入条件下，粗粒热影响区始终存在最大硬度值，这表明实验钢的最小热输入应高于0·92 kJ mm-1，以避免形成焊接冷裂纹。对于所有热输入，焊缝金属中复杂夹杂物的尺寸分布非常相似，这主要是因为停留时间短并不能使夹杂物迅速生长。

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