Effect of processing parameters on grain boundary modifications to alloy Inconel 718

Li, Qiangyong; Guyot, B.M.; Richards, N.L.

doi:10.1016/j.msea.2006.12.129

Cited by 16 publications

(11 citation statements)

References 15 publications

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“…One approach involves pre-straining the material followed by annealing at comparatively lower temperature for a long time (24-72 hours). Another multi-cycle approach uses two or more iterations of cold work (6-30%) followed by relatively high temperature annealing for short times minutes) and has also been shown to increase the low CSL boundary fraction [11,12]. In addition, the multi-cycle approach results in numerous disruptions in the random high angle grain boundary (HAB) network.…”

Section: Introductionmentioning

confidence: 99%

Iterative thermomechanical processing of alloy 600 for improved resistance to corrosion and stress corrosion cracking

Telang

Gill²,

Kumar

et al. 2016

Acta Materialia

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The effects of thermomechanical processing (TMP) with iterative cycles of 10% cold work and strain annealing, on corrosion and stress corrosion cracking (SCC) behavior of alloy 600 was studied. The associated microstructural and cracking mechanisms were elucidated using transmission (TEM) and scanning electron microscopy (SEM), coupled with precession electron diffraction (PED) and electron back scatter diffraction (EBSD) mapping. TMP resulted in increased fraction of low coincident site lattice (CSL) grain boundaries whilst decreasing the connectivity of random high angle grain boundaries. This disrupted random grain boundary network and large fraction of low CSL boundaries reduced the propensity to sensitization, i.e. carbide precipitation and Cr depletion. After TMP, alloy 600 (GBE) also showed higher intergranular corrosion resistance. Slow strain rate tests in 0.01 M Na 2 S 4 O 6 solution at room temperature show TMP lowered susceptibility to intergranular SCC. To better understand the improvements in corrosion and SCC resistance, orientation maps of regions around cracks were used to analyze the interactions between cracks and various types of grain boundaries and triple junctions (TJs). Detailed analysis showed that cracks were arrested at J1 (1-CSL) and J2 (2-CSL) type of TJs. The probability for crack arrest at special boundaries and TJs, calculated using percolative models, was found to have increased after TMP, which also explains the increase in resistance to corrosion and SCC in GBE alloy 600. A clear correlation and mechanistic understanding relating grain boundary character, sensitization, carbide precipitation and susceptibility to corrosion and stress corrosion cracking was established.

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Section: Introductionmentioning

confidence: 99%

Iterative thermomechanical processing of alloy 600 for improved resistance to corrosion and stress corrosion cracking

Telang

Gill²,

Kumar

et al. 2016

Acta Materialia

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“…Electron backscatter diffraction (EBSD) technique is a powerful method to obtain the detailed information on the orientations of grains and subgrains. Many researchers have studied the deformation microstructures and the nucleation mechanisms of DRX for different alloys by EBSD [11][12][13][14], and it was also in application to the orientation analysis of superalloy 718 in the last few years [10,15,16]. The aim of the present study was to investigate the evolution of DRX microstructure in hot deformed superalloy 718.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution during dynamic recrystallization of hot deformed superalloy 718

Wang

Shao

Zhen

et al. 2008

Materials Science and Engineering: A

195

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“…The associated grain growth during GBCD optimization has been reported in many low to medium stacking fault energy materials. [31,32] This signifies that some grain growth is always associated with GBE, at least in the case of low to medium stacking fault energy materials, whereas increase in CSL frequency is primarily due to R3 twin boundaries. Figure 13 also reveals that the fraction of R1 boundaries decreases with the increase in fraction of R3 boundaries.…”

Section: Discussionmentioning

confidence: 99%

Grain Boundary Microstructural Control through Thermomechanical Processing in a Titanium-Modified Austenitic Stainless Steel

Mandal

Sivaprasad

Raj

et al. 2008

Metall Mater Trans A

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The present study discusses the grain boundary microstructural control in a 15Cr-15Ni-2.2Mo-Ti modified austenitic stainless steel (commonly known as alloy D9) through a one-step thermomechanical treatment. The experimental methodology adopted in this investigation was based on the strain annealing approach in which a small amount of strain (5 to 15 pct) was imparted on the solution-annealed (SA) sample. The cold-deformed samples were subsequently annealed at various temperatures (1173 to 1273 K) for different time periods (0.5 to 2 hours). It was observed that annealing after 5 pct deformation induces anomalous grain growth with a moderate increase in number fraction of coincidence site lattice (CSL) boundaries. However, a prestrain of 10 to 15 pct followed by annealing at 1273 K for 0.5 to 2 hours was found to be a suitable thermomechanical processing schedule to increase the number fraction of CSL boundaries (particularly R3 and its variants) significantly. Further, the well-connected network of random grain boundaries present in the SA specimen was substantially disrupted in these processing conditions due to the incorporation of R3 and its variants. The preceding results were discussed with reference to strain-induced grain growth vis-a`-vis strain-induced boundary migration (SIBM) following deformation and annealing.

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Effect of processing parameters on grain boundary modifications to alloy Inconel 718

Cited by 16 publications

References 15 publications

Iterative thermomechanical processing of alloy 600 for improved resistance to corrosion and stress corrosion cracking

Iterative thermomechanical processing of alloy 600 for improved resistance to corrosion and stress corrosion cracking

Microstructure evolution during dynamic recrystallization of hot deformed superalloy 718

Grain Boundary Microstructural Control through Thermomechanical Processing in a Titanium-Modified Austenitic Stainless Steel

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