摘要
采用ABAQUS有限元分析软件对氢在不均质焊接接头的扩散进行了模拟计算 ,结果表明 ,对 2 0MnNiMo钢焊接接头 ,随时间延续 ,焊缝金属中的氢浓度逐渐降低 ,而熔合区以外区域氢的浓度经历了一个峰值变化过程。由于焊接接头不同部位氢的扩散系数和溶解度不同 ,一定时间以后热影响区中的氢浓度超过焊缝金属和母材 ;预热使焊缝金属中的氢浓度快速降低 ,并缩短热影响区出现峰值浓度的时间 ;后热可加速氢从焊接接头的逸出 ,降低热影响区氢浓度峰值并缩短其出现时间。
In this study,finite element analyses were performed to simulate hydrogen diffusion behavior in heterogeneous welded joints.The results indicated that:(1)for 20MnNiMo welded joint,the hydrogen concentration within weld metal decreases in a monotonic manner as time elapses,in contrast,hydrogen concentration outside the fusion zone goes through a local maximum.Because of different diffusivity and solubility in different region of welded joint,the hydrogen concentration within heat affected zone(HAZ)will exceed that within weld metal and base metal some time later;(2)preheating decreases hydrogen concentration within weld metal rapidly and shortens the time to reach a peak hydrogen concentration within HAZ;(3)postheating may accelerate hydrogen removal from welded joint and reduse the peak hydrogen concentration within HAZ and shorter time of reaching the pear value.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2000年第3期51-54,共4页
Transactions of The China Welding Institution
基金
国家科委攀登B计划预选项目
机械工业技术发展基金!资助项目 (95JA0 40 6 )
