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10～20kJ/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35kJ/cm后,韧性急剧下降。而对于焊管内焊缝,当热输入处于17～35kJ/cm时,其粗晶区可获得最佳韧性水平;当焊接热输入小于17kJ/cm和大于35kJ/cm时,其粗晶区的韧性水平均有所下降。
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.
出处
《热加工工艺》
CSCD
北大核心
2010年第9期1-4,7,共5页
Hot Working Technology
基金
国家自然科学基金资助项目(50874090)
关键词
X80管线钢
焊管
内焊缝
焊接热输入
焊接热模拟
X80 pipeline steel
welded pipe
inside weld
welding heat input
welding thermal simulation
