Effect of martensitic transformation on nano/ultrafine-grained structure in 304 austenitic stainless steel

2017 ◽  
Vol 24 (12) ◽  
pp. 1231-1237 ◽  
Author(s):  
Na Gong ◽  
Hui-bin Wu ◽  
Gang Niu ◽  
Jia-ming Cao ◽  
Da Zhang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Martensitic Transformation ◽  
Austenitic Stainless Steel ◽  
Ultrafine Grained Structure ◽  
Ultrafine Grained ◽  
304 Austenitic Stainless Steel

Formation of Ultrafine Grained Structure in SUS 304 Stainless Steel Produced by High Pressure Torsion (HPT)

2007 ◽  
Vol 561-565 ◽  
pp. 847-852 ◽  
Author(s):  
Jin Guo Li ◽  
Minoru Umemoto ◽  
Yoshikazu Todaka ◽  
Koichi Tsuchiya
Keyword(s):  
Stainless Steel ◽  
Strain Rate ◽  
High Strain ◽  
Rotation Speed ◽  
High Pressure Torsion ◽  
304 Stainless Steel ◽  
Ultrafine Grained Structure ◽  
Ultrafine Grained ◽  
304 Austenitic Stainless Steel ◽  
High Rotation Speed

SUS 304 austenitic stainless steel was processed by HPT at room temperature with different rotation speed. It was found that the microstructure evolution and composed phases along the progress of HPT were sensitive to the strain rate (rotation speed). During deforming with the low strain rate, the deformation-induced dynamic phase transformation (DPT) from austenite (γ) to martensite (α’) occurred and the microstructure is characterized by elongated submicron α’ grains after 10 revolutions. While the euqiaxed nanocrystalline α’ grains were produced after HPT at the continuously alternative low and high strain rate. XRD analyses showed that multiple DPT of γ→α’→γ→α’ took place during HPT at the continuously alternative low and high rotation speed. Based on the experimental results, it was proposed that the euqiaxed ultrafine grained structure were produced by multiple DPT under the high strain and strain gradient.

The effect of Ni depletion on athermal martensitic transformation in 304 austenitic stainless steel

2021 ◽  
pp. 111063
Author(s):  
Fazlollah Sadeghi ◽  
Tahereh Zargar ◽  
Jong Wan Kim ◽  
Yoon-Uk Heo ◽  
Jae Sang Lee ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Martensitic Transformation ◽  
Austenitic Stainless Steel ◽  
304 Austenitic Stainless Steel
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