Statistical study on the effects of heterogeneous deformation and grain boundary character on hydrogen-induced crack initiation and propagation in twining-induced plasticity steels

2021 ◽  
pp. 109796
Author(s):  
Hao Fu ◽  
Xiaojun Chen ◽  
Wei Wang ◽  
Giorgio Pia ◽  
Jianliang Zhang ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Grain Boundary ◽  
Statistical Study ◽  
Crack Initiation And Propagation ◽  
Boundary Character ◽  
Grain Boundary Character ◽  
Initiation And Propagation ◽  
Heterogeneous Deformation

scholarly journals Effect of Carbides and γ/γ' Eutectic on Crack Initiation and Propagation in Ni-based Superalloy

2020 ◽  
Vol 2 (2) ◽  
Author(s):  
Junwei QIN ◽  
Xiaohua CHEN ◽  
Kaixuan CHEN ◽  
Xinghai YANG ◽  
Weiyang XIE ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Grain Boundary ◽  
Induction Melting ◽  
Boundary Carbide ◽  
Crack Initiation And Propagation ◽  
Casting Method ◽  
Arc Melting ◽  
Initiation And Propagation ◽  
Tensile Process ◽  
Strain Hardening Rate

The Ni-based Udemit720Li superalloy tends to form large γ/γ' eutectic on grain boundaries (GBs) during solidification due to the addition of excessive Al and Ti elements, which provides convenience to study the effect of carbide and γ/γ' eutectic on crack initiation and propagation during tensile process. In this paper, Udemit720Li superalloy samples were prepared by induction melting casting method, arc melting and suction casting method. The microstructure, tensile properties and mechanism of crack initiation and propagation in Ni-based superalloy fabricated by two methods are investigated. The results exhibit γ/γ' eutectic accelerates the stress concentration at GB and thus leads to premature fracture failure. The samples with grain-boundary eutectic have higher strain hardening rate, but their cumulative and local misorientations are lower. For samples without eutectic at GB, the primary crack initiates at grain-boundary carbide along GB and extends along GB or into grain matrix, and exhibits better deformation performance and dislocation storage capacity within grains.

scholarly journals Effects of Different Parameters on Initiation and Propagation of Stress Corrosion Cracks in Pipeline Steels: A Review

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 590 ◽  
Author(s):  
M.A. Mohtadi-Bonab
Keyword(s):  
Grain Boundary ◽  
Crack Propagation ◽  
Grain Boundaries ◽  
Stress Corrosion ◽  
Coincidence Site Lattice ◽  
Rolling Plane ◽  
Pipeline Steels ◽  
Boundary Character ◽  
Grain Boundary Character ◽  
Initiation And Propagation

The demand for pipeline steels has increased in the last several decades since they were able to provide an immune and economical way to carry oil and natural gas over long distances. There are two important damage modes in pipeline steels including stress corrosion cracking (SCC) and hydrogen induced cracking (HIC). The SCC cracks are those cracks which are induced due to the combined effects of a corrosive environment and sustained tensile stress. The present review article is an attempt to highlight important factors affecting the SCC in pipeline steels. Based on a literature survey, it is concluded that many factors, such as microstructure of steel, residual stresses, chemical composition of steel, applied load, alternating current (AC) current and texture, and grain boundary character affect the SCC crack initiation and propagation in pipeline steels. It is also found that crystallographic texture plays a key role in crack propagation. Grain boundaries associated with {111}∥rolling plane, {110}∥rolling plane, coincidence site lattice boundaries and low angle grain boundaries are recognized as crack resistant paths while grains with high angle grain boundaries provide easy path for the SCC intergranular crack propagation. Finally, the SCC resistance in pipeline steels is improved by modifying the microstructure of steel or controlling the texture and grain boundary character.

306 Evaluation of Fracture Strength by crack initiation and propagation on grain boundary in polycrystals

2006 ◽  
Vol 2006.55 (0) ◽  
pp. 123-124
Author(s):  
Takaaki SANO ◽  
Kazuaki TOYAMA ◽  
Hirohisa KIMACHI ◽  
Takashi IAI ◽  
Keisuke TANAKA ◽  
...  
Keyword(s):  
Crack Initiation ◽  
Grain Boundary ◽  
Fracture Strength ◽  
Crack Initiation And Propagation ◽  
Initiation And Propagation

The Influence of Copper Addition on Crack Initiation and Propagation in an Al-Si-Mg Alloy During Cyclic Testing

2020 ◽  
Author(s):  
Toni Bogdanoff ◽  
Lucia Lattanzi ◽  
Mattia Merlin ◽  
Ehsan Ghassemali ◽  
Salem Seifeddine
Keyword(s):  
Crack Initiation ◽  
Mg Alloy ◽  
Cyclic Testing ◽  
Crack Initiation And Propagation ◽  
Copper Addition ◽  
Initiation And Propagation

scholarly journals Influence of Grain Boundary Character on Creep Void Formation in Alloy 617

2009 ◽  
Vol 40 (12) ◽  
pp. 2803-2811 ◽  
Author(s):  
Thomas Lillo ◽  
James Cole ◽  
Megan Frary ◽  
Scott Schlegel
Keyword(s):  
Grain Boundary ◽  
Void Formation ◽  
Alloy 617 ◽  
Boundary Character ◽  
Grain Boundary Character

Impact of grain boundary character on grain rotation

2014 ◽  
Vol 80 ◽  
pp. 141-148 ◽  
Author(s):  
Luis A. Barrales-Mora ◽  
Jann-Erik Brandenburg ◽  
Dmitri A. Molodov
Keyword(s):  
Grain Boundary ◽  
Grain Rotation ◽  
Boundary Character ◽  
Grain Boundary Character
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