摘要
采用焊接热模拟技术、冲击试验和显微组织分析方法,对X100管线钢在二次焊接热循环不同峰值温度条件下获得的组织性能进行了系统的研究,着重讨论了临界粗晶区韧性及组织的变化规律。结果表明,在X100管线钢的双面焊或多道焊中,当二次热循环峰值温度处于Ac1～Ac3临界区时,韧性急剧降低,表现为临界粗晶区局部脆化。粗大晶粒和粗大、富碳M-A组元的形成是临界粗晶区局部脆化的主要原因。
The microstructure and properties of X100 pipeline steel heated in different second peak temperature were studied by thermal simulation technique, impact test and microscopic analysis method. The change rules of toughness and microstructure in intercritical coarse-grained heat-affected zone （ICCGHAZ） were discussed. The results indicate that when the second peak temperature is in the range of Ac1-Ac3, the toughness of X100 pipeline steel decreases obviously during the both sides or multi-pass welding, which can exhibit local embrittlement of ICCGHAZ. The large size grain and constituent （M-A） with rich carbon are the main reasons leading to the local embrittlement of ICCGHAZ.
出处
《热加工工艺》
CSCD
北大核心
2012年第23期150-153,共4页
Hot Working Technology
基金
国家自然科学基金资助项目(51174165)
西安石油大学全日制硕士研究生创新基金资助项目(2011cx100936)
陕西省教育厅科研计划资助项目(11JK0803)
关键词
X100管线钢
二次峰值温度
局部脆化
X100 pipeline steel
second peak temperature
local embrittlement
