Grain boundary character and stress corrosion cracking behavior of Co-Cr alloy fabricated by selective laser melting

2021 ◽  
Author(s):  
Xin Dong ◽  
Ning Li ◽  
Yanan Zhou ◽  
Huabei Peng ◽  
Yuntao Qu ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Stress Corrosion ◽  
Selective Laser Melting ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Laser Melting ◽  
Cracking Behavior ◽  
Boundary Character ◽  
Grain Boundary Character

Application of Microdiffraction in Sem for Assessing Intrinsic Materials Susceptibility to Intergranular Corrosion and Stress Corrosion Cracking

1997 ◽  
Vol 3 (S2) ◽  
pp. 573-574
Author(s):  
G. Palumbo ◽  
E.M. Lehockey ◽  
P. Lin
Keyword(s):  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Service Failure ◽  
Coincidence Site Lattice ◽  
Corrosion Cracking ◽  
Polycrystalline Materials ◽  
Materials Synthesis ◽  
Intergranular Cracking ◽  
Grain Boundary Character

Intergranular degradation processes (e.g., corrosion, stress corrosion cracking) are a frequent cause of premature and unpredictable service failure of engineering components. Since these processes cause component failure via propagation through the intercrystalline network, they are strongly dependent upon the distribution of specific grain boundary structures in the material. Previous studies have shown that grain boundaries crystallographically described by low Σ (Σ≤29) Coincidence Site Lattice (CSL) relationships can often selectively display a high resistance (and often immunity) to corrosion and fracture. Recent advances in automated microdiffraction techniques (e.g., EBSP) in SEM have now made it possible to readily evaluate grain boundary character distributions in conventional polycrystalline materials. by utilizing this technique, and by formulating and applying simple stochastic models for the propagation of intergranular cracking and corrosion processes, the opportunity now exists for (1) improved component lifetime prediction, and (2) the optimization of materials synthesis techniques to yield intergranular-degradation resistant microstructures.

Evolution of Grain Boundary Precipitates in Al 7075 Upon Aging and Correlation with Stress Corrosion Cracking Behavior

2012 ◽  
Vol 44 (3) ◽  
pp. 1268-1278 ◽  
Author(s):  
Ramasis Goswami ◽  
Stanley Lynch ◽  
N. J. Henry Holroyd ◽  
Steven P. Knight ◽  
Ronald L. Holtz
Keyword(s):  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Cracking Behavior ◽  
Al 7075

Effects of Cold-Work Degree on Stress Corrosion Cracking Behavior of Alloy 600 in Simulated Boiling Water Reactor (BWR) Water Environments

CORROSION ◽  
10.5006/3426 ◽  
2020 ◽  
Vol 76 (10) ◽  
pp. 930-940
Author(s):  
Wen-Feng Lu ◽  
Jiunn-Yuan Huang ◽  
Tai-Cheng Chen ◽  
Kun-Chao Tsai
Keyword(s):  
Grain Boundary ◽  
Stress Corrosion ◽  
Crack Growth ◽  
Stress Corrosion Cracking ◽  
Cold Work ◽  
Growth Behavior ◽  
Corrosion Cracking ◽  
Boiling Water ◽  
Alloy 600 ◽  
Cracking Behavior

The growth behavior of stress corrosion cracking (SCC) of Alloy 600 with different cold-work levels was investigated in simulated boiling water reactors water environments. In addition, a correlation of cold-work levels, grain boundary characteristic, and the SCC growth behavior of Alloy 600 were studied. The results show that grains with high residual strain caused by cold work provide transgranular crack growth paths. The SCC growth rates of the specimens also increase with an increase in the degree of cold work and decrease remarkably after switching to the hydrogen water chemistry environment. Grain boundary character proves to be a factor more important than the localized strain concentration at the grain boundary in terms of its role in the intergranular crack growth rate of the Alloy 600 with a cold-work degree from 20% to 30%.

Effect of Grain Boundary Character Distribution on Stress Corrosion Cracking Behavior in Austenitic Stainless Steels

2005 ◽  
Vol 475-479 ◽  
pp. 3863-3866 ◽  
Author(s):  
Ryo Ishibashi ◽  
Toshiaki Horiuchi ◽  
J. Kuniya ◽  
M. Yamamoto ◽  
Sadahiro Tsurekawa ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Stainless Steels ◽  
Austenitic Stainless Steels ◽  
Corrosion Cracking ◽  
Grain Boundary Character Distribution ◽  
Grain Boundary Character ◽  
Character Distribution ◽  
Boundary Character Distribution

The effect of grain boundary character distribution (GBCD) on intergranular stress corrosion cracking (IGSCC) in austenitic stainless steels in high temperature water was verified experimentally. GBCD control using the strain annealing method increased the fraction of low- S coincidence site lattice (CSL) boundaries and the segmentalized network of random grain boundaries in austenitic stainless steels. The fractions of low- S CSL boundaries of GBCD controlled steels were 75–85%, while those of uncontrolled steels were 60–70%. Creviced bent beam tests were conducted at 561 K in pure water containing 8 ppm dissolved oxygen for stress corrosion cracking (SCC) evaluation. The tests revealed that GBCD control suppressed IGSCC initiation or propagation and that cracks were predominantly propagated along random grain boundaries. It is considered that induced lower- S CSL boundaries result in high resistance to IGSCC.

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