ChemInform Abstract: GRAIN BOUNDARY DIFFUSION OF HYDROGEN DURING STRESS CORROSION CRACKING OF ALZNMG

1980 ◽  
Vol 11 (52) ◽  
Author(s):  
L. RATKE ◽  
W. GRUHL
Keyword(s):  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Boundary Diffusion ◽  
Grain Boundary Diffusion ◽  
Corrosion Cracking ◽  
Diffusion Of Hydrogen

Grain boundary engineering for improving stress corrosion cracking of 304 stainless steel

2019 ◽  
Vol 35 (4) ◽  
pp. 477-487 ◽  
Author(s):  
Tingguang Liu ◽  
Qin Bai ◽  
Xiangkun Ru ◽  
Shuang Xia ◽  
Xiangyu Zhong ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
304 Stainless Steel ◽  
Grain Boundary Engineering

Microstructure and Microchemistry of Inconel 600 STEAM Generator Tubing

2000 ◽  
Vol 6 (S2) ◽  
pp. 356-357
Author(s):  
V. Perovic ◽  
A. Perovic ◽  
G.C. Weatherly ◽  
A.M. Brennenstuhl
Keyword(s):  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Analytical Electron Microscopy ◽  
Corrosion Cracking ◽  
Steam Generators ◽  
Intergranular Stress Corrosion ◽  
Candu Reactors ◽  
Inconel 600 ◽  
Water Reactors

Inconel 600 is an austenitic Ni-Cr-Fe alloy which is extensively used for tubing in steam generators of pressurized light water reactors (PWR) and CANDU heavy water reactors, because of its excellent mechanical properties and corrosion resistance. However, there have been instances of intergranular stress corrosion cracking of tubes in operating steam generators. The chemistry and the structure of grain boundaries and grain boundary precipitation have emerged as factors of prime importance in understanding stress corrosion cracking and intergranular attack of nickel-base alloys (see e.g. ref. l).In this study analytical electron microscopy was used to determine the microstructure of grain boundary and matrix precipitates, grain boundary chromium content and dislocation substructure of selected steam generating tubes of CANDU reactors. The results of the in-service materials are compared with as-received material. Two JEOL 2010 STEM instruments were used in this study.

Intergranular microchemistry and stress corrosion cracking

1981 ◽  
Vol 377 (1771) ◽  
pp. 477-501 ◽  
Keyword(s):  
Grain Boundary ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Nitrate Solution ◽  
Corrosion Cracking ◽  
Low Alloy Steels ◽  
Intergranular Stress Corrosion ◽  
Oxidation Potentials ◽  
Alloy Steels ◽  
Impurity Elements

An important contributory role of grain boundary segregation of residual impurities in the intergranular stress-corrosion cracking of carbon and low alloy steels is proposed. Experimental results are presented of the stress corrosion susceptibility of mild steel in nitrate solution, and in relation to varying grain boundary composition as monitored by Auger electron spectroscopy. The harmfulness of a particular impurity element depends on three factors: its bulk level; its segregation thermodynamics and kinetics resulting in an equilibrium enrichment at the grain boundaries; and its ability to promote electrochemical dissolution of the grain boundary. A hierarchy of impurity elements that exacerbate stress corrosion cracking is presented and correlated with equilibrium oxidation potentials. The results and simple model allow the prediction of the relative harmfulness of impurity elements with respect to intergranular stress corrosion in commercial carbon and low alloy steels from a knowledge of the bulk concentration only. This enables significant improvements in performance to be designed in the alloy by respecifying lower levels of only the one or two highly detrimental impurities.

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