P92钢蠕变-疲劳交互作用下的裂纹扩展行为
在630℃下，对P92钢进行应力控制下的蠕变-疲劳交互作用实验，研究P92钢高温蠕变-疲劳交互作用下的裂纹扩展行为，并结合断口形貌分析蠕变-疲劳裂纹扩展的机理以及a-N曲线的转折点含义。结果表明：P92钢在蠕变-疲劳交互作用下的断裂属于蠕变韧性断裂，应该用（Ct）avg作为裂纹扩展的断裂参量；P92钢在蠕变-疲劳交互条件下，试样的断口主要表现为蠕变孔洞以及微裂纹。此外，发现a-lg（Ni/Nf）曲线以及（da-dN）-N曲线中的拐点，分别对应蠕变-疲劳裂纹萌生区向扩展区转变周次以及扩展区向瞬断区转变的周次。...
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| Published in | 材料工程 Vol. 45; no. 5; pp. 112 - 117 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
天津市现代连接技术重点实验室,天津300072
2017
天津大学材料科学与工程学院,天津300072 |
| Subjects | |
| Online Access | Get full text |
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| Summary: | 在630℃下，对P92钢进行应力控制下的蠕变-疲劳交互作用实验，研究P92钢高温蠕变-疲劳交互作用下的裂纹扩展行为，并结合断口形貌分析蠕变-疲劳裂纹扩展的机理以及a-N曲线的转折点含义。结果表明：P92钢在蠕变-疲劳交互作用下的断裂属于蠕变韧性断裂，应该用（Ct）avg作为裂纹扩展的断裂参量；P92钢在蠕变-疲劳交互条件下，试样的断口主要表现为蠕变孔洞以及微裂纹。此外，发现a-lg（Ni/Nf）曲线以及（da-dN）-N曲线中的拐点，分别对应蠕变-疲劳裂纹萌生区向扩展区转变周次以及扩展区向瞬断区转变的周次。 |
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| Bibliography: | JING Hong-yang1,2, TANG Meng-ru1,2, ZHAO Lei1,2, XU Lian-yong1,2 （1. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;2. Tianjin Key Laboratory of Advanced Joining Technology, Tianjin 300072, China） 11-1800/TB P92 steel creep-fatigue interaction crack growth fracture morphology fracture parameter Creep-fatigue interaction tests of P92 steel at 630℃ under stress-controlled were carried out, and the crack propagation behaviour of P92 steel was studied. The fracture mechanism of crack growth under creep-fatigue interaction and the transition points in a-N curves were analyzed based on the fracture morphology. The results show that the fracture of P92 steel under creep-fatigue interaction is creep ductile fracture and the （Ct）avg parameter is employed to demonstrate the crack growth behaviour; in addition, the fracture morphology shows that the crack growth for P92 steel under creep-fatigue interaction is mainly caused by the nucleation and growth of the creep voids and micro-cr |
| ISSN: | 1001-4381 1001-4381 |
| DOI: | 10.11868/j.issn.1001-4381.2015.000699 |