‘Hall-Petch’ type of relationship between the extent of intergranular corrosion and grain size in a Ni-based superalloy

On the role of grain size variation on pitting corrosion and passive film behavior of Alloy 600H

“…Grain boundary overlaid IQ maps of (a) R10‐1373K‐1h, (b) AR, (c) R0‐1423K‐24h, and (d) R0‐1473K‐12h specimens (grain boundary color code: Σ3, Σ9, Σ27—white; random high‐angle grain boundaries—black). [ 17 ] …”

“…GBCD and retained strain do not occur. [ 17 ] To obtain fine‐grained microstructure, the AR specimen was cold rolled to 10% thickness reduction and subsequently annealed at 1373 K for 1 h followed by water quenching. Furthermore, the AR specimens were subjected to prolonged annealing treatment for 24 h at 1423 K and 12 h at 1473 K followed by water quenching to achieve a distinct range of coarser grain sizes.…”

“…This parameter could be evaluated through the following equation: [27] F I G U R E 1 Grain boundary overlaid IQ maps of (a) R10-1373K-1h, (b) AR, (c) R0-1423K-24h, and (d) R0-1473K-12h specimens (grain boundary color code: Σ3, Σ9, Σ27white; random high-angle grain boundariesblack). [17] d l = 2.785 × , eq (3) where l is the intercept length. While measuring the intercept length from EBSD maps, the twin boundary was not considered as a grain boundary to essentially obtain the surface area per unit volume of RHAGBs.…”

Intergranular corrosion in evolving media: Experiment and modeling by cellular automata

“…The preferential attack of these grain boundaries results in a specific corrosion mode named intergranular corrosion (IGC). Challenges relative to intergranular corrosion concern various materials such as nickel based alloys [1][2][3], aluminum based alloys [4][5][6] or steels [7][8][9]. One specific issue is about IGC of nonsensitized stainless steels (SSs) in nitric acid.…”

Effects of a Magnetic Field on the Intergranular Corrosion of Inconel 690 in NaCl Solution

“…Sunil et al (B. et al, 2013) improved IGC resistance of the 600 alloy through thermal mechanical processing. Kaithwas et al (2020) studied the effect of grain size on the sensitization-desensitization and IGC response of the 600H alloy, and they proposed that microstructures with coarse grains showed enhanced anti-sensitization ability, which was attributed to the inhibition of Cr diffusion from inside the body of the alloy to the grain boundaries by large grains. Recently, Xu et al (2019) studied IGC of 625-X65 welded joints and found that small grain size and high Fe content were the main reasons for the high sensitivity to IGC of welded joints.…”