摘要
针状铁素体(AF)一直被认为是提升大线能量焊接用钢粗晶热影响区(CGHAZ)韧性最有效的组织之一,但在一些试验中,有时即使发现CGHAZ中有大量AF组织,韧性也并不好。为了研究大线能量焊接用钢CGHAZ中不同类型组织及夹杂物对其冲击韧性的影响作用,从CGHAZ冲击试验出发,借鉴前人研究经验,对影响CGHAZ韧性的主要因素进行深入分析。结果显示,CGHAZ中微米级夹杂物容易成为裂纹萌生点,而晶内位错效应、冲击触发的体积效应等可以抑制裂纹传播,CGHAZ中析出的少量纳米级碳氮化物可以提升AF形核能力,增强CGHAZ韧性和强度,但当析出粒子过多时,会降低CGHAZ韧性。
Acicular ferrites(AF)are considered to be one of the most effective structures to improve the toughness of the coarse-grain heat affect zones(CGHAZ)for high heat input welding steels.But sometimes,the toughness of the CGHAZ is not satisfactory in some experiments,even if there are a large number of AF structures.In view of this,the factors that hinder or accelerate the propagation of cracks in the CGHAZ are analyzed with reference to the previous studies and the impact experiment of CGHAZ.The analysis results show that the micron inclusions in the CGHAZ are easy to become the crack initiation point,but the interaction of intragranular dislocation and the volume effect produced by the impact can increase the propagation resistance of crack.Meanwhile,the study also found that a small number of nanoscale carbides can enhance the ability to induce AF nucleation in the CGHAZ,and increase the toughness and strength of the CGHAZ.However,when the precipitated particles are too much,the toughness of the CGHAZ is reduced.
作者
邹宗园
韩舒婷
李银潇
王超
ZOU Zong-yuan;HAN Shu-ting;LI Yin-xiao;WANG Chao(Key Laboratory of Advanced Forging and Stamping Technology and Science of Ministry of Education, Yanshan University,Qinhuangdao 066004,Hebei,China;The State Key Laboratory of Rolling and Automation,Northeastern University,Shenyang 110819,Liaoning,China;Chinese 91315 People's Liberation Army Troops,Dalian 116041,Liaoning,China)
出处
《中国冶金》
CAS
北大核心
2019年第1期18-24,共7页
China Metallurgy
基金
国家自然科学基金资助项目(51475408
51675465)
河北省重点研发计划自筹资助项目(17211911)
华中科技大学材料成形与模具技术国家重点实验室开放课题研究基金资助项目(P2019-018)
