Ductile failure of X100 pipeline steel – Experiments and fractography

2013 ◽  
Vol 43 ◽  
pp. 513-525 ◽  
Author(s):  
Rahmatollah Ghajar ◽  
Giuseppe Mirone ◽  
Arash Keshavarz
Keyword(s):  
Pipeline Steel ◽  
Ductile Failure ◽  
X100 Pipeline Steel

Comparison of Fracture Models to Quantify the Effects of Material Plasticity on the Ductile Fracture Propagation in Pipelines

2018 ◽  
Author(s):  
Aida Nonn ◽  
Marcelo Paredes ◽  
Vincent Keim ◽  
Tomasz Wierzbicki
Keyword(s):  
Ductile Fracture ◽  
Fracture Resistance ◽  
Pipeline Steel ◽  
Ductile Failure ◽  
Fracture Propagation ◽  
Plastic Behavior ◽  
Wide Range ◽  
X100 Pipeline Steel ◽  
Fracture Models ◽  
Stress States

Various numerical approaches have been developed in the last years aimed to simulate the ductile fracture propagation in pipelines transporting CO2 or natural gas. However, a reliable quantification of the influence of material plasticity on the fracture resistance is still missing. Therefore, more accurate description of the material plasticity on the ductile fracture propagation is required based on a suitable numerical methodology. In this study, different plasticity and fracture models are compared regarding the ductile fracture propagation in X100 pipeline steel with the objective to quantify the influence of plasticity parameters on the fracture resistance. The plastic behavior of the investigated material is considered by the quadratic yield surface in conjunction with a non-associated quadratic plastic flow potential. The strain hardening can be appropriately described by the mixed Swift-Voce law. The simulations of ductile fracture are conducted by an uncoupled, modified Mohr-Coulomb (MMC) and the micromechanically based Gurson-Tvergaard-Needleman (GTN) models. In contract to the original GTN model, the MMC model is capable of describing ductile failure over wide range of stress states. Thus, ductile fracture resistance can be estimated for various load and fracture scenarios. Both models are used for the simulation of fracture propagation in DWTT and 3D pressurized pipe sections. The results from the present work can serve as a basis for establishing the correlation between plasticity parameters and ductile fracture propagation.

scholarly journals The Pitting Susceptibility Investigation of Passive Films Formed on X70, X80, and X100 Pipeline Steels by Electrochemical Noise and Mott-Schottky Measurements

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
Yang Zhao ◽  
Ping Liang ◽  
Yanhua Shi ◽  
Yunxia Zhang ◽  
Tao Yang
Keyword(s):  
Distribution Function ◽  
Electrochemical Noise ◽  
Pipeline Steel ◽  
Stochastic Theory ◽  
Gumbel Distribution ◽  
Passive Films ◽  
Initiation Rate ◽  
Pipeline Steels ◽  
X100 Pipeline Steel ◽  
Pit Initiation

The pitting susceptibility of passive films formed on X70, X80, and X100 pipeline steels was investigated by means of electrochemical noise (EN) and Mott-Schottky measurements. The EN results were analyzed according to the shot-noise theory and stochastic theory. Pit initiation process was analyzed quantitatively using the Weibull distribution function. Pit growth process was simulated by Gumbel distribution function. The experimental results of Mott-Schottky plots showed that the passive films formed on the three pipeline steels displayed an n-type semiconductor character, and the passive film for X100 pipeline steel has the lowest donor density (ND) among the three passive films. The EN results demonstrated that X100 pipeline steel had the lowest pit initiation rate and pit growth probability, which implied that the X100 pipeline steel had the lowest pitting susceptibility.

scholarly journals Effect of secondary peak temperature on microstructure and toughness in ICCGHAZ of laser-arc hybrid welded X100 pipeline steel joints

2020 ◽  
Vol 9 (4) ◽  
pp. 7838-7849
Author(s):  
Xiaonan Qi ◽  
Hongshuang Di ◽  
Xiaonan Wang ◽  
Zhenguang Liu ◽  
R.D.K Misra ◽  
...  
Keyword(s):  
Pipeline Steel ◽  
Peak Temperature ◽  
Secondary Peak ◽  
X100 Pipeline Steel ◽  
Steel Joints
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