论文部分内容阅读
采用热模拟试验,研究了不同焊接工艺条件下高强度船板钢E550焊接热影响区的组织和性能。结果表明:t8/5对粗晶区组织有较大的影响,当t8/5较小时,组织以板条贝氏体和粒状贝氏体为主;随着t8/5的增加,粒状贝氏体逐渐增加,冲击韧性逐渐降低;当t8/5为300s时,组织以粒状贝氏体为主。随着峰值温度的升高,单道次焊接热影响区的冲击功先升高后降低,存在粗晶区和临界区脆化,而双道次焊接热影响区的冲击功逐渐升高,临界粗晶区韧性较低。组织分析表明,粗晶区脆化主要是由粗大粒状贝氏体造成的,而临界区和临界粗晶区脆化主要是由沿晶界分布的粗大M-A组元所致。
The thermal simulation test was used to study the microstructure and properties of the HAZ of high strength ship steel E550 under different welding conditions. The results showed that t8 / 5 had a significant effect on the coarse grain structure. When t8 / 5 was small, the lath bainite and granular bainite were the main components. With the increase of t8 / 5, Body gradually increased, impact toughness gradually reduced; when t8 / 5 is 300s, the organization mainly granular bainite. With the increase of the peak temperature, the impact energy of heat affected zone firstly increases and then decreases, and the coarse grain zone and critical zone are embrittled, while the impact energy of double pass weld heat affected zone gradually increases, Coarse grain toughness lower. The microstructure analysis shows that the embrittlement in the coarse grain region is mainly caused by the coarse granular bainite, while the brittleness in the critical region and the critical coarse grain region is mainly caused by the coarse M-A component distributed along the grain boundary.