Study on fracture toughness and fatigue crack growth rate of X80 pipeline steel

1. Study on fracture toughness and fatigue crack growth rate of X80 pipeline steel Reporter: Luo Li Advisor: Xu Chen

2. 4

3. Introduction 目录 References COD gage 4 The plan

4. 总体概况 Introduction 目录 References Introduction COD gage 4 The plan

5. 调研方法 Introduction

6. 调研方法 X120 X65 X80 X100 X70 Introduction

7. Microstructural FAD Pre-strain Crack closure LBB Criterion Introduction References

8. [1] S.Y. Shin, B. Hwang, S. Kin, S. Lee. Fracture toughness analysis in transition temperature region of API X70 pipeline steels[J]. Materials Science and Engineering : A , 2006,429(15):196~204 [2] S.Y. Shin, B. Hwang, S. Kin, S. Lee. Correlation of microstructure and charpy impact properties in API X70 and X80 line-pipe steels[J]. Materials Science and Engineering : A , 2007,458:281~289 [3] 赵亚娟.针状铁素体型管线钢的显微组织分析[J].南钢科技与管理, 2007,(4):7~9 MA GBF PF P References

9. Microstructural FAD Pre-strain Crack closure LBB Criterion References

10. [1] Cosham, A., Palmer, A., and Hopkins, P., 2003, “An experimental Study of the Effect of Pre-strain on the Fracture Toughness of Line Pipe Steel,” in Proceedings of the 10th International Conference on Pressure Vessel Technology (ICPVT-10), Vienna, Austria, p. 357 [2] Cosham, A., 2001, “A Model of Pre-Strain Effects on Fracture Toughness,” ASME J. Offshore Mech. Arct. Eng., 123, pp. 182–190. [3]Cosham, A., Hagiwara, N., Fukuda, N., and Masuda, T., 2002, “A Model toPredict the Effect of Pre-strain on the Fracture Toughness of Line Pipe Steel,”in Proceedings of the 4th International Pipeline Conference (IPC 2002), Calgary,Alberta, Canada, ASME, IPC02–27324, B, pp. 1965–1978. Pre-strain Negative effect References X

11. Microstructural FAD Pre-strain Crack closure LBB Criterion References

12. [1] K. Shinobu, H. Naoto, M. Tomoki. Evaluation of Leak-Before-Break (LBB) Behavior For axially Notched X65 and X80 Line Pipes[J]. Journal of Offshore Mechanics and Arctic Engineering, NOVEMBER 2004, 126:350~357 [2] K. Shinobu, H. Naoto, M. Tomoki. Experimental Evaluation of Leak-Before-Break (LBB) Behavior for High-Grade Line Pipes With an Axial Through-Wall Flaw. 21st International Conference on Offshore Mechanics and Arctic Engineering. OMAE2002-28204 pp. 173-180  References

13. Microstructural FAD Pre-strain Crack closure LBB Criterion References

14. FAD: Failure Assessment Diagram [1] M.Hadj Melian, Z. zari, G. pluvinage. Gouge assessment for pipes and associated transferability problem[J]. Engineering Failure Analysis, 2010,17(5):1117~1126 [2] S. Cicero, V. Madrazo. Assessment of notched structural components using Failure Assessment Diagrams and the Theory of Critical Distances[J]. Engineering Fracture Mechanics, 2011,78(16):2809~2825 References

15. Microstructural FAD Pre-strain Crack closure LBB Criterion References

16. [1] GB/T 21143-2007 Metallic materials-Unified method of test for determination of quasistatic fracture toughness [2] GB/T 6398-2000 Metallic materials-fatigue crack growth rate tests [3] ASTM MNL27 28-027096-30 Elastic-Plastic fracture : Laboratory test procedures [1]Y.P. Kim, C.M. Kim.Near- threshold Fatigue Crack Growth Behavior and Crack Closure of Natural Gas Pipeline Steels[J]. Procedia Engineering, 2011,10:813~820 The crack closure phenomenon of the X80 steel in the low ΔK region is roughness-induced. References

17. 建议总结 Proposals References COD gage

18. COD gage Scale=2.43

19. The plan COD gage

20. Uniaxial tensile Test Under displacement control The plan

21. Fracture ToughnessTest Under displacement control at room temperature The plan

22. The plan

23. 1. Introduction 2. References 3. COD gage 4. The plan Thank you!