Sigma phase morphologies in cast and aged super duplex stainless steel

2009 ◽  
Vol 60 (8) ◽  
pp. 792-795 ◽  
Author(s):  
Marcelo Martins ◽  
Luiz Carlos Casteletti
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Sigma Phase ◽  
Super Duplex Stainless Steel

scholarly journals Thermal cycling induced stress–assisted sigma phase formation in super duplex stainless steel

2019 ◽  
Vol 182 ◽  
pp. 108003 ◽  
Author(s):  
Jian-Sin Li ◽  
Guan-Ju Cheng ◽  
Hung-Wei Yen ◽  
Liberty T. Wu ◽  
Yo-Lun Yang ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Thermal Cycling ◽  
Duplex Stainless Steel ◽  
Phase Formation ◽  
Sigma Phase ◽  
Super Duplex Stainless Steel ◽  
Induced Stress

Influence of Aging Time on Sigma Phase Precipitation in SAF2507 Super-Duplex Stainless Steel

2009 ◽  
Vol 620-622 ◽  
pp. 355-358 ◽  
Author(s):  
Wei Zhang ◽  
De Ning Zou ◽  
Guang Wei Fan ◽  
Jiao Li
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Aging Time ◽  
Sigma Phase ◽  
Phase Interface ◽  
Super Duplex Stainless Steel ◽  
Phase Precipitation ◽  
X Ray Diffraction ◽  
Austenitic Phase ◽  
Hardness Tester

Specimens of SAF2507 super-duplex stainless steel were heated at 920°C with different aging time. The phase transformation and development of microstructure in the materials were investigated by color optical microscopy, scan electron microscopy, energy-dispersive spectroscopy and X-ray diffraction. The hardness was tested by HB-3000B hardness tester. The facts that sigma phase precipitated right after 2 min. At 920°C, the grain boundaries to be the preferential precipitation sites and the sites changed from ferritic-austenitic phase interface into the inside of ferritic phase was found. Increase in aging time is proportional to the increase in sigma phase precipitation mass was most frequently observed in specimens. For phase precipitation, the values of hardness of the super-duplex stainless steel was enhanced evidently.

Sign in / Sign up

Export Citation Format

Share Document