607 Reverse Transformation Behavior Induced by Shot-peening for SUS410S Martensitic Stainless Steel

2016 ◽  
Vol 2016.65 (0) ◽  
pp. _607-1_-_607-2_
Author(s):  
Nagomi Tsuboi ◽  
Serika Higa ◽  
Hisashi Sato ◽  
Yoshimi Watanabe
Keyword(s):  
Stainless Steel ◽  
Shot Peening ◽  
Martensitic Stainless Steel ◽  
Reverse Transformation ◽  
Transformation Behavior

Reverse Transformation Behavior Induced by Shot-Peening for SUS410S Martensitic Stainless Steel

2016 ◽  
Vol 879 ◽  
pp. 2003-2007
Author(s):  
Nagomi Tsuboi ◽  
Serika Higa ◽  
Hisashi Sato ◽  
Yoshimi Watanabe
Keyword(s):  
Stainless Steel ◽  
Shear Strain ◽  
Shot Peening ◽  
Martensitic Stainless Steel ◽  
Volume Fraction ◽  
Martensite Phase ◽  
Reverse Transformation ◽  
Transformation Behavior ◽  
Thermally Induced ◽  
Large Shear Strain

Reverse transformation behavior of thermally-induced martensite phase (α’) in martensitic stainless steel by the shot-peening is investigated. It is found that volume fraction of austenite phase (γ) on the peened surface is increased by the shot-peening under elevated temperature. This means that reverse transformation from thermally-induced α’ to γ can be induced by the shot-peening. Moreover, with decreasing the distance between blast nozzle and specimen (blast distance), the reverse transformation occurs more remarkably. This is because that larger shear strain can be induced by the shot-peening with shorter blast distance. Furthermore, thickness of the deformation-induced layer becomes larger as the blast distance decreases. It can be concluded that the reverse transformation in SUS410S with thermally-induced α’ occurs by large shear strain during the shot-peening.

Effects of Peening Direction on Reverse Transformation Induced by Shot-Peening for Fe-33%Ni Alloy

2021 ◽  
Vol 1016 ◽  
pp. 1252-1257
Author(s):  
Hisashi Sato ◽  
Takuto Tominaga ◽  
Tadachika Chiba ◽  
Tomokazu Moritani ◽  
Yoshimi Watanabe
Keyword(s):  
Phase Transformation ◽  
Compressive Stress ◽  
Shot Peening ◽  
Transformation Temperature ◽  
Volume Fraction ◽  
Residual Compressive Stress ◽  
Reverse Transformation ◽  
Phase Transformation Temperature ◽  
Transformation Behavior ◽  
Ni Alloy

Effects of peening direction on the reverse transformation induced by the shot-peening for the Fe-33 mass%Ni alloy with large amount of martensite (α’) are investigated. When the angle between the peened surface and the peening direction (Hereafter, peening angle) is 90 o, the reverse transformation occurs and subsequently martensitic transformation is induced by the shot-peening. On the other hand, in case of the peening angle of 30 o, only reverse transformation occurs. Furthermore, the volume fraction of austenite (γ) in the specimen after the shot-peening increases as the peening angle decreases. This means that the reverse transformation induced by the shot-peening is enhanced by decreasing the peening angle. Moreover, residual compressive stress around the peened surface increases as the peening angle decreases. Since the hydrostatic compressive stress decreases phase transformation temperature, the phase transformation temperature around the peened surface would be decreased by the shot-peening. Therefore, the reverse transformation behavior depending on the peening angle can be explained by the residual compressive stress due to the shot-peening.

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