朱海山, 徐连勇, 曹健, 贾鲁生. t8/5对X100管线钢热影响区粗晶区断裂韧性的影响[J]. 焊接, 2021, (3): 5-12. DOI: 10.12073/j.hj.20201106002
引用本文: 朱海山, 徐连勇, 曹健, 贾鲁生. t8/5对X100管线钢热影响区粗晶区断裂韧性的影响[J]. 焊接, 2021, (3): 5-12. DOI: 10.12073/j.hj.20201106002
ZHU Haishan, XU Lianyong, CAO Jian, JIA Lusheng. Effect of t8/5on fracture toughness of CGHAZ of X100 pipeline steel[J]. WELDING & JOINING, 2021, (3): 5-12. DOI: 10.12073/j.hj.20201106002
Citation: ZHU Haishan, XU Lianyong, CAO Jian, JIA Lusheng. Effect of t8/5on fracture toughness of CGHAZ of X100 pipeline steel[J]. WELDING & JOINING, 2021, (3): 5-12. DOI: 10.12073/j.hj.20201106002

t8/5对X100管线钢热影响区粗晶区断裂韧性的影响

Effect of t8/5on fracture toughness of CGHAZ of X100 pipeline steel

  • 摘要: 按照BS 7448标准并结合显微分析方法,采用热模拟技术对t8/5条件下X100级管线钢焊接热影响区粗晶区(CGHAZ)的断裂韧性(CTOD)进行了研究。结果表明,CTOD值随着t8/5的增加而增加,显微组织由板条贝氏体向粒状贝氏体转化。当t8/5=40 s时,原奥氏体晶界处出现的粗化链状M-A组元,使得断裂韧性出现下降;当t8/5=50 s时,断裂韧性继续增加,但随着热输入的增大,晶粒有粗化的倾向。

     

    Abstract: According to BS 7448 standard and microscopic analysis method, thermal simulation technique was used to study the fracture toughness (CTOD) of the coarse grain zone in heat affected zone of X100 grade pipeline steel under different t8/5. The results showed that CTOD value increased as the t8/5 time increased, and microstructure was transformed from lath bainite to granular bainite. The coarse chain M-A component appeared at the grain boundary of the prior austenite att8/5= 40 s, which caused a small decrease in fracture toughness. Whent8/5 was 50 s, the fracture toughness continued to increase. However, the grains tended to coarsen as t8/5 increased.

     

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