试样尺寸对SA508-3钢焊接接头断裂韧度的影响
Effect of sample size on fracture toughness of SA508-3 steel welded joint
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摘要: 针对大型核容器SA508-3钢焊接接头断裂韧度进行了研究.结果表明,在大试样条件下,母材、焊缝金属及热影响区的断裂韧度存在差异,焊缝金属的断裂韧度优于热影响区,母材的断裂韧度最低.试样几何尺寸直接影响裂纹尖端的应力状态,小试样时裂纹尖端处于平面应力状态,母材、焊缝金属及热影响区全部呈韧窝断裂,表现出良好的塑性;大试样时裂纹尖端处于平面应变状态,母材断口特征转变为准解理与解理混合断裂,热影响区为典型的准解理断裂,焊缝为韧窝断裂.Abstract: Fracture toughness of S08-3 steel welded joints was investigated for large nuclear vessel. The results show that the fracture toughness was different for base metal,weld metal and heat affected zone with larger sample size. The weld metal had superior fracture toughness compared to heat affected zone,and the fracture toughness of base metal was lowest. Sample size directly affected the stress state at the crack Lip which endured plane stress in small sample. The base metal,weld metal and heat affected zone had good toughness with dimple fracture morphology. However, the crack tip in large sample endured plane strain condition. The fracture morphology of base metal presented quasi-cleavage and cleavage mixed mode. The heat af-fected zone was typical quasi-cleavage mode, and the weld metal revealed dimple fracture.
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Keywords:
- SA508-3 steel /
- fracture toughness /
- welded joint /
- sample size
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