Influencing Factors of Bending Assessment Method for Intergranular Corrosion of Stainless Steels
摘 要
用嵌含有GTN延性损伤模型的ABAQUS有限元法, 模拟研究了不锈钢晶间腐蚀弯曲评价方法中材料力学性能、弯曲角度和压头直径对弯曲试样塑性应变分布、延性损伤和裂纹起裂的影响规律, 分析了其对晶间腐蚀弯曲评价结果的影响。结果表明: 随着试样弯曲角度的增大和弯曲压头直径的减小, 试样拉伸面的塑性应变增加, 试样越容易产生弯曲开裂; 在晶间腐蚀弯曲评价标准中, 当固定弯曲角度和压头直径时, 对于塑性、韧性和抗断裂综合力学性能较低的不锈钢材料, 在弯曲过程中材料本身会发生开裂; 因此, 需要考虑材料力学性能对晶间腐蚀弯曲评价结果的影响; 对于该研究中的典型的奥氏体不锈钢材料, 当其弯曲断裂应变低于0.51左右时, 在弯曲过程中材料本身会发生开裂, 不宜用弯曲方法来评价其晶间腐蚀敏感性。
Abstract
The finite element method (FEM) based on GTN damage model was used to investigate the effects of mechanical properties of materials, bending angle and pressure head diameter on plastic strain distribution, ductile damage and crack initiation of bending specimens for assessing intergranular corrosion of stainless steels. The results show that the tensile plastic strain in the specimens increases with the increasing of bending angle and decreasing of pressure head diameter, and the specimens become easier to crack. For the fixed bending angle and pressure head diameter in the assessment standard for intergranular corrosion, cracks may initiate during bending for some stainless steels with lower plasticity, toughness and fracture resistance. So the effects of the mechanical properties of materials on the bending assessment results for intergranular corrosion should be considered. For the typical austenitic stainless steel in this study, when its bending fracture strain is less than about 0.51, cracks may occur during bending test. In this case, the bending method may not be suitable for assessing the intergranular corrosion of stainless steels.
中图分类号 TG142.71
所属栏目 试验与研究
基金项目 上海市重点科技攻关项目子课题(10521100507); 国家自然科学基金资助项目(51075149)
收稿日期 2011/11/30
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备注邱智伟(1988-),男,硕士研究生。
引用该论文: QIU Zhi-wei,WANG Guo-zhen,XUAN Fu-zhen. Influencing Factors of Bending Assessment Method for Intergranular Corrosion of Stainless Steels[J]. Physical Testing and Chemical Analysis part A:Physical Testing, 2012, 48(8): 495~499
邱智伟,王国珍,轩福贞. 不锈钢晶间腐蚀弯曲评价方法的影响因素[J]. 理化检验-物理分册, 2012, 48(8): 495~499
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参考文献
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【3】强健. 对不锈钢焊接接头腐蚀试验方法的探讨[J]. 安装,1993(5):10-13.
【4】徐在林. 关于奥氏体不锈钢晶间腐蚀试验的几点体会[J]. 焊接,2000(6):39-40.
【5】WANG X,ROY G,XU S. Numerical simulation of ductile crack growth in pipeline steels[C]. San Antonio,Texas,USA:ASME Pressure Vessels and Piping Division Conference,2007:105-111.
【6】RAKIN M,CVIJOVIC Z,GRABULOV V. Prediction of ductile fracture initiation using micromechanical analysis[J]. Engineering Fracture Mechanics,2007,71:813-827.
【7】荆洪阳,徐连勇,霍立兴,等. 考虑材料微观塑性损伤的焊接接头延性裂纹扩展行为分析[J]. 焊接学报,2003(12):4-6.
【8】JIANG F,ZHAO K,SUN J. Evaluation of interfacial crack growth in biomaterial metallic joints loaded by symmetric three-point bending[J]. International Journal of Pressure Vessels and Piping,2003,80(2):129-137.
【9】TVERGARRD V. Influence of voids on shear band instabilities under plane strain conditions[J]. International Journal of Fracture,1981,17(3):389-395.
【10】KUNA M,SUN D Z. Three-dimensional cell model analyses of void growth in ductile materials[J]. International Journal of Fracture,1996,81(3):235-258.
【11】SIEGMUND T,BERNAUER G,BROCKS W. Two models of ductile fracture in contest:Porous metal plasticity and cohesive elements[J]. ECF12 Fracture from Defects,1998,9:933-938.
【12】SCHMITT W,SUN D Z,BLAUEL J G. Damag mechanics analysis (Gurson model) and experimental verification of the behaviour of a crack in a weld-cladded component[J]. Nuclear Engineering and Design,1997,74(3):237-246.
【13】SKALLERUD B,ZHANG Z L. A 3D numerical study of ductile tearing and fatigue crack growth under nominal cyclic plasticity[J]. International Journal of Solids and Structures,1997,34(24):3141-3161.
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