扩展初始角对镍基合金焊接过渡区裂纹应力腐蚀行为的影响

发布时间：2018-04-27 00:10

本文选题：应力腐蚀开裂 + 镍基合金　；参考：《中国科技论文》2016年16期

【摘要】：焊接接头过渡区的复杂成分分布和材料性能梯度都会改变裂尖的力学状态,进而影响接头的应力腐蚀开裂行为。为了对镍基合金焊接过渡区的应力腐蚀裂纹扩展行为进行准确预测,利用ABAQUS软件对不同扩展初始角裂纹尖端的应力应变及扩展驱动力进行了分析,研究结果表明:裂纹扩展到达熔合线边界后会停止扩展;若扩展驱动力足够大,裂纹会发生偏折,转为沿熔合线边界在镍基合金焊缝内扩展;有限元分析的结果与实验结果一致。
[Abstract]:The complex composition distribution and material performance gradient in the transition zone of welded joint will change the mechanical state of the crack tip and then affect the stress corrosion cracking behavior of the joint. In order to accurately predict the stress-corrosion crack propagation behavior in the welding transition zone of nickel-based alloys, the stress-strain and propagation driving forces at the tip of different initial corner cracks were analyzed by using ABAQUS software. The results show that the crack growth will stop when it reaches the boundary of the fusion line, and if the driving force is large enough, the crack will deflect and propagate along the boundary of the fusion line in the Ni-base alloy weld. The results of finite element analysis are in agreement with the experimental results.
【作者单位】：西安科技大学理学院;西安科技大学机械工程学院;西安科技大学工程训练中心;
【基金】：国家自然科学基金资助项目(11502195) 高等学校博士学科点专项科研基金资助项目(20136121110001) 西安科技大学博士启动金资助项目(2015QDJ041)
【分类号】：TG407;TG172.9

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