预热温度对X100管线钢焊接性的影响

Influence of preheating temperature on weldability of X100 pipeline steel

关键词:  X100管线钢  焊接性  预热温度  插销试验

Key words:  X100 pipeline steel  weldability  preheat temperature  implant test

摘要:

采用插销试验法和热影响区最高硬度法测定了在80，120，160℃三种预热温度下X100管线钢的临界断裂应力以及热影响区的硬度值，并对金相组织以及断口形貌进行分析，综合研究了预热温度对X100管线钢焊接性的影响.结果表明，随着预热温度的升高，X100管线钢临界断裂应力逐渐增大，HAZ区硬度逐渐降低；呈板条束状的BF组织越来越窄小且分布越来越紧密；起裂区氢致开裂的断口特征逐渐减少.

Abstract:

comprehensive study the influence of preheating temperature on weldability of X100 pipeline steel. The results showed that with the increase of preheating temperature, X100 pipeline steel critical fracture stress increases gradually, HAZ hardness reduced gradually; As preheating temperature increases, the lath bundle of BF is more and more narrow and the distribution is more and more closely; As preheating temperature increases, the HIC features reduced gradually. Though the implant test method and heat affected zone the highest hardness method, this article measure the critical fracture stress and hardness value of heat affected zone of X100 pipeline steel under different preheat temperatures which is 80, 120, and 160℃, analysis the microstructure and fracture morphology. This paper research the influence of preheating temperature on weldability of X100 pipeline steel. The results showed that with the increase of preheating temperature, the critical fracture stress of X100 pipeline steel increases gradually and the hardness of HAZ reduced. The lath bundle of BF become narrower and closer, and the HIC features in the cracking zone decreased when the preheating temperature raised.