The effect of cold work on the precipitation kinetics of an advanced austenitic steel

Todd, J. A.; Ren, J. C.

doi:10.1016/0921-5093(89)90106-8

Cited by 23 publications

(8 citation statements)

References 23 publications

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“…[88][89][90][91][92] Dutta et al reported for Nb micro-alloyed steels that due to the deformation process, the precipitate formation and coarsening are enhanced. [78] Nowotnik reported the presence of Morich precipitates on the deformation bands after hot compression tests of alloy 718.…”

Section: Strain-induced Precipitationmentioning

confidence: 99%

Identification of Mo-Rich M23C6 Carbides in Alloy 718

Aghajani¹,

Tewes²,

Parsa

et al. 2016

Metall Mater Trans A

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In the present study, we systematically identify and characterize a (Nb, Mo)-rich M 23 C 6 type of M 23 C 6 carbide with a lattice parameter of 1.094 nm in alloy 718 for the first time using a combination of selected area electron diffraction pattern and powder X-ray diffraction analysis. The time-temperature-precipitation diagrams of the precipitates in both annealed and strained conditions are obtained by particle analysis using an automated scanning electron microscopy method. (Nb, Mo)-rich M 23 C 6 carbides first precipitate after 24 hours at 1223 K (950°C) annealing, while they form after 10 minutes at 1273 K (1000°C) in the strained condition. This correlates with the excess dislocations produce during deformation.

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Section: Strain-induced Precipitationmentioning

confidence: 99%

Identification of Mo-Rich M23C6 Carbides in Alloy 718

Aghajani¹,

Tewes²,

Parsa

et al. 2016

Metall Mater Trans A

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“…Other studies also suggested that the carbides were identified as type M23C6 precipitates (M= Cr, Fe) .Therefore, the particles at the grain boundaries were likely to be chromium carbides and titanium carbides. From the results reported previously [26][27][28], it is also speculated that the very fine intragranular precipitates were likely to be MC type carbides. The EDS results were taken at four different points to accurately predict the particles present and XRD analysis was also made at the weld region (Figure 12 and 13).…”

Section: Eds and Xrd Analysismentioning

confidence: 71%

Modelling and Characterization of Laser Welded Incoloy 800 Ht Joints

Sathiya¹,

Srirangan²

2016

Adv. Sci. Technol. Res. J.

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This study aims at finding the effect of laser welding speed on incoloy 800 HT. This alloy is one of the potential materials for Generation IV nuclear plants. Laser welding has several advantages over arc welding such as low fusion zone, low heat input and concentrated heat intensity. Three different welding speeds were chosen and CO 2 laser welding was performed. 2D modeling and simulation were done using ANSYS 15 to find out the temperature distribution at different welding speeds and it was found that an increase in the welding speed decreased the temperature. Mechanical properties such as tensile strength, toughness and hardness were evaluated. The effect of welding speed on metallurgical characteristics was studied using optical microscopy (OM), Scanning Electron Microscopy (SEM) with EDS, X-Ray Diffraction (XRD) technique and fractographic analysis. From the results it was found that high welding speed (1400 mm/min) decreased the joint strength. The M23C6 and Ni3Ti carbides were formed in a discrete chain and in a globular form along the grain boundaries of the weld region which increased the strength of the grain boundaries. Fractographic evaluations of the tested specimens for welding speed (1000 and 1200) mm/min showed deep and wide dimples indicating ductile failures.

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“…Metallographic observations [8] indicated the presence of grain boundary precipitates in the thermally aged alloys. In cold worked and thermally aged steel of this type, grain boundary precipitates of the type M 23 C 6 and MC have been reported [9,10]. In this paper, it is shown that the Larson-Miller parameter can be used to describe the effects of static thermal exposure of 20% cold worked Alloy D9 on the subsequent tensile properties at 300, 723 and 923 K.…”

Section: Introductionmentioning

confidence: 95%