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。
The welding transition zone exhibits complicated composition and material property grads, which has an obvious effect on the mechanical state of crack tip, and thus influences the stress corrosion cracking behavior of the welding joints. To accurate- ly predict the stress corrosion cracking behavior in welding transition zone of Ni-based alloys, the stress-strain fields and their crack driving forces at crack tips with different propagation initiation angle are analyzed by ABAQUS software. Results show that the crack growth reveals cession after crack front reaching the fusion boundary. The crack growth direction will deviate along the fusion boundary if the crack driving force is large enough, which leads the crack propagation in the Ni-based alloy weld. The FEM analysis is consistent with the experimental results.
出处
《中国科技论文》
CAS
北大核心
2016年第16期1864-1866,1871,共4页
China Sciencepaper
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)
关键词
应力腐蚀开裂
镍基合金
过渡区
扩展初始角
扩展驱动力
stress corrosion cracking
Ni-hased alloy
transition zone
propagation initiation angle
crack driving force
