A Study on Microstructural Evolution and Dynamic Recrystallization During Isothermal Deformation of a Ti-Modified Austenitic Stainless Steel

2010 ◽  
Vol 42 (4) ◽  
pp. 1062-1072 ◽  
Author(s):  
Sumantra Mandal ◽  
A. K. Bhaduri ◽  
V. Subramanya Sarma
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Dynamic Recrystallization ◽  
Microstructural Evolution ◽  
Isothermal Deformation

Kinetics, Mechanism and Modeling of Microstructural Evolution during Dynamic Recrystallization in a 15Cr-15Ni-2.2Mo-Ti Modified Austenitic Stainless Steel

2007 ◽  
Vol 550 ◽  
pp. 601-606 ◽  
Author(s):  
Sumantra Mandal ◽  
P.V. Sivaprasad ◽  
R.K. Dube ◽  
Baldev Raj
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Dynamic Recrystallization ◽  
Microstructural Evolution ◽  
Artificial Neural Network Model ◽  
Processing Conditions ◽  
Microstructural Study ◽  
Experimental Findings ◽  
Kinetics Of ◽  
Alloy D9

Kinetics, mechanism and modeling of the microstructural evolution of a 15Cr-15Ni- 2.2Mo-0.3Ti modified austenitic stainless steel (alloy D9) during dynamic recrystallization (DRX) have been investigated. The kinetics of DRX has been investigated employing a modified Johnson- Mehl-Avrami-Kolmogorov (JMAK) model. The microstructural study shows that nucleation of new grains during DRX takes place on the parent grain boundary by a bulging mechanism. No significant texture component has been found to develop in the recrystallized matrix. A substantial amount of twins have been observed in the recrystallized matrix. It is proposed that twins play an important role during the nucleation and subsequent expansion of DRX in alloy D9, which in turn moderates the texture in the recrystallized matrix. An artificial neural network model has also been developed to predict the fraction of DRX and grain size, as a function of processing conditions. A good correlation between experimental findings and predicted results has been obtained.

Effects of Helium Production and Displacement Damage on Microstructural Evolution and Mechanical Properties in Helium-Implanted Austenitic Stainless Steel and Ferritic/Martensitic Steel

2021 ◽  
Vol 1024 ◽  
pp. 53-69
Author(s):  
Eiichi Wakai ◽  
Shuhei Nogami ◽  
Akira Hasegawa ◽  
Nariaki Okubo ◽  
Shigeru Takaya ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Microstructural Evolution ◽  
Martensitic Steel ◽  
Microstructural Development ◽  
Displacement Damage ◽  
Lifetime Measurements ◽  
Helium Concentration ◽  
Positron Annihilation Lifetime

The effects of helium concentration and displacement damage on microstructural evolution at low dpa and low helium concentration were mainly investigated in specimens of austenitic stainless steel 316FR or SUS304 and a high chromium martensitic steel (HCM12A). The 316FR and HCM12A specimens were implanted uniformly with helium at 823 K up to 30 appm-He or 50 appm-He by 50 MeV cyclotron accelerator using energy degraders. After the helium implantation, the microstructures were examined by a transmission electron microscopy and positron annihilation lifetime measurements. Irradiation hardening behaviors were analyzed using SUS304 and HCM12A steels at 823 K implanted with He ion up to 100 appm with different He/dpa ratios in the HIT ion irradiation experiments and the hardening behaviors were examined by nano indentation method. In the irradiation and annealing specimens, these mechanical properties and microstructures were examined to understand the effects of helium production, displacement damage and annealing on microstructural development, and kinetic Monte Carlo (kMC) simulations were also performed to understand the microstructural development, and the results were compared with the results of TEM observation and positron annihilation lifetime measurements. Important some differences in the microstructural developments such as cavity formation and growth between austenitic stainless steel and martensitic steel were observed in low dpa and low helium concentration conditions.

Austenitic Stainless Steel: Microstructural Evolution

2016 ◽  
pp. 243-253 ◽  
Author(s):  
Andrey Belyakov ◽  
Zhanna Yanushkevich ◽  
Iaroslava Shakhova ◽  
Rustam Kaibyshev
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Microstructural Evolution
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