摘要
采用热模拟技术模拟了不同焊接条件下的焊接粗晶区 ,研究了工艺参数、组织和韧性的关系。结果表明 :线能量对冲击韧性的影响最为显著。当采用 8kJ/cm的线能量和 14 0℃的预热温度时 ,粗晶区的组织由板条贝氏体和一定量的粒状贝氏体组成 ,由于粒状贝氏体对板条贝氏体的分割作用 ,使板条贝氏体的长度较小 ,方向性弱 ,韧性优越。因此在焊接X80管线钢时 ,应采用较小的线能量和适当的预热温度。
Thermal simulating technology was used to simulate weld CGHAZ of pipeline steel X80 for the purpose of investigation on the relationship between welding parameters and toughness. The experimental results showed that heat input strongly affected toughness. For the heat input of 8 kJ/cm and preheated temperature of 140 ℃, impact toughness value of specimen was highest for the formation of a certain quantity of granular bainite which can effectively partite lath bainite. So it is concluded that lower heat input and suitable preheated temperature should be adopted for the welding process of high strength pipeline steel X80.
出处
《压力容器》
北大核心
2005年第2期5-8,13,共5页
Pressure Vessel Technology
关键词
X80管线钢
热模拟
粗晶区
工艺参数
冲击韧性
X80 pipeline steel
thermal simulation
CGHAZ
welding parameters
impact toughness
