焊接热输入对X80管线钢及其焊管内焊缝粗晶区韧性的影响
Effect of Welding Heat Input on Toughness of Coarse-grained Zone of X80 Pipeline Steel and Inside Weld in Welded Pipe
张骁勇1， 李青霞1， 徐学利1， 张雪琴2， 杨 艳
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作者单位：（1. 西安石油大学 材料科学与工程学院，陕西 西安 710065； 2. 中国石油天然气集团公司 管材研究所，陕西 西安 710065）
中文关键字：X80管线钢； 焊管； 内焊缝； 焊接热输入； 焊接热模拟
英文关键字：X80 pipeline steel; welded pipe; inside weld; welding heat input; welding thermal simulation
中文摘要：利用焊接热模拟技术、材料力学性能检测和显微分析方法，对X80管线钢及其制管过程中内焊缝在不同热输入下粗晶区的韧性以及组织特征进行了研究。结果表明，对于X80管线钢母材粗晶区及其焊管内焊缝粗晶区，随着焊接热输入的增大，其韧性变化规律存在一定的差别。对于X80管线钢母材，其获得最佳韧性的热输入范围为10～20 kJ/cm，此时的韧性值基本和母材保持在同一水平；当热输入大于20 kJ/cm后，其韧性呈下降趋势；当热输入大于35 kJ/cm后，韧性急剧下降。而对于焊管内焊缝，当热输入处于17～3 5 kJ/cm时，其粗晶区可获得最佳韧性水平；当焊接热输入小于17 kJ/cm和大于35 kJ/cm时，其粗晶区的韧性水平均有所下降。
英文摘要：The effects of welding heat input on toughness and microstructure characteristics of coarse-grained heat-affected zone(CGHAZ) in X80 grade pipeline steel and inside weld in welded pipe were investigated by welding thermal simulation technology, microscopic analysis method and mechanical property testing. The results show that with the increase of welding heat input, the toughness distribution of CGHAZ of X80 pipeline steel base metal and inside weld in welded pipe is different. For the steel, when the heat input is 10～20 kJ/cm, CGHAZ get the best toughness and toughness values remain the same level with the base metal. When the welding heat input is greater than 20 kJ/cm, the toughness presents downward trend; when the welding heat input is greater than 35 kJ/cm, the toughness drops sharply. But for the inside weld in welded pipe, when the welding heat input is 17～35 kJ/cm, inside weld CGHAZ can get the best toughness level; when the welding heat input is less than 17 kJ/cm or greater than 35 kJ/cm, the toughness levels of X80 inside weld CGHAZ entirely decline.