Effect of Heat Treatment on the Microstructure Evolution and Sensitization Behavior of High-Silicon Stainless Steel

2020 ◽  
Vol 29 (9) ◽  
pp. 6014-6024
Author(s):  
Prince Setia ◽  
Ayush Anand ◽  
T. Venkateswaran ◽  
K. Thomas Tharian ◽  
Sudhanshu S. Singh ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Microstructure Evolution ◽  
High Silicon ◽  
Sensitization Behavior

Microstructure Evolution in Isothermal Heat Treatment of 0Cr32Ni7Mo4NDuplex Stainless Steel

2014 ◽  
Vol 789 ◽  
pp. 314-319
Author(s):  
Yu Lai Chen ◽  
Hong He ◽  
Fei Fang
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Microstructure Evolution ◽  
Volume Fraction ◽  
Decomposition Reaction ◽  
Optical Microscope ◽  
Isothermal Heat Treatment ◽  
Σ Phase ◽  
Temperature Range ◽  
Δ Phase

The microstructure evolution of as-cast 0Cr32Ni7Mo4N hyper duplex stainless steel during the isothermal heat treatment in the temperature range of 800°C-1300°Cwas studied in the present investigation. The morphologies and precipitates were observed and determined by using optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The results show that eutectoid decomposition reaction (δ→σ+γ2) take place in ferrite (δ) phase during isothermal heat treatment in the temperature range of 800°C-1000°C. Sigma (σ) phase and secondary austenite (γ2) phase coexist as cellular structure. Lamellar Cr2N precipitates in δ phase mostly when isothermal heat treatment at 800°Cand 850°C, while it only appears in γ phase between 900°C and 1050°C. As the annealing temperature rising, the quantity of σ phase, Cr2N and γ2 phase decreases. The volume fraction ratio of ferrite and austenite is stable between 1100°C and 1300°C, and γ → δ transformation is hard to occur.

A Study on Structural, Corrosion, and Sensitization Behavior of Ultrafine and Coarse Grain 316 Stainless Steel Processed by Multiaxial Forging and Heat Treatment

2017 ◽  
Vol 27 (1) ◽  
pp. 271-281 ◽  
Author(s):  
Seyed Rahim Kiahosseini ◽  
Seyyed Javad Mohammadi Baygi ◽  
Gholamreza Khalaj ◽  
Ali Khoshakhlagh ◽  
Razieh Samadipour
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Coarse Grain ◽  
316 Stainless Steel ◽  
Sensitization Behavior

Effect of Twice Stablizing Heat Treatment on the Properties of 347H Stainless Steel

2021 ◽  
Vol 904 ◽  
pp. 82-87
Author(s):  
Zhi Juan Zhao ◽  
Xue Tao Zhang ◽  
Qiang Dai ◽  
Yan Rong ◽  
Jing Miao Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Stainless Steel ◽  
Room Temperature ◽  
Corrosion Properties ◽  
Double Ring ◽  
Microstructure Observation ◽  
Sensitization Process ◽  
Sensitization Behavior ◽  
Test Impact

In this study, the mechanical properties and intergranular corrosion properties of 347H austenitic stainless steel were studied by tensile test, impact test, double-ring electrochemical potentiodynamic reactivation test (DL-EPR) and microstructure observation in three states of solution, primary and twice stabilized state. Results showed that the key mechanical properties of 347H stainless steel under three different conditions had little change, and the mechanical properties at room temperature were not affected by the stabilizing heat treatment. After 12h of sensitization, the solution material showed obvious sensitization behavior, and the Ir/Ia index exceeded 0.3, indicating that the material entered the range of complete sensitization. Both primary and twice stabilizing heat treatment can significantly reduce the occurrence time of sensitization and prevent the sensitization process. However, the stabilizing heat treatment cannot completely prevent the material sensitization, and it must be combined with other methods .

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