Investigation of the effect of the types and densities of grain boundary carbides on grain boundary cavitation resistance of AISI 321 stainless steel under creep–fatigue interaction

2004 ◽  
Vol 370 (1-2) ◽  
pp. 223-229 ◽  
Author(s):  
Kyung Seon Min ◽  
Ki Jae Kim ◽  
Soo Woo Nam
Keyword(s):  
Stainless Steel ◽  
Grain Boundary ◽  
Cavitation Resistance ◽  
Creep Fatigue ◽  
Aisi 321

scholarly journals Effect of The Degree of Cold Work and Sensitization Time on Intergranular Corrosion Behavior in Austenitic Stainless Steel

2019 ◽  
Vol 19 (1) ◽  
pp. 32-43 ◽  
Author(s):  
Z. Ławrynowicz
Keyword(s):  
Stainless Steel ◽  
Grain Boundary ◽  
Intergranular Corrosion ◽  
Cold Work ◽  
Cold Deformation ◽  
Carbide Precipitation ◽  
Boundary Carbide ◽  
Wide Range ◽  
Aisi 321 ◽  
Sensitization Time

AbstractPresent paper deals with the influence of a wide range of cold rolling (5, 10, 15 and maximum 40% cold deformation) and the sensitization time (aging at 700°C for 0.12, 0.5, 1, 4, 16 and 32 hours) on intergranular corrosion (IGC). Intergranular corrosion of commercial stainless steel type X6CrNiTi18-10 (1.4541, AISI 321) is frequently observed in several process environments. These localized attacks are normally attributed to the carbide precipitation and concomitant depletion of chromium near grain boundary due to steel exposure to sensitization temperature. Such undesirable microchemistry is expected to be changed further if the material undergoes deformation prior to sensitization. The consequences of deformation on IGC have been investigated by using EN ISO 3651-1methods (Huey test – Corrosion test in nitric acid medium by measurement of loss in mass). Introducing deformation to the investigated stainless steel seems to change the kinetics of carbide precipitation M23C6 and thereby changes it resistance to IGC. Cold deformation before sensitization reduces the intensity of intergranular corrosion of this steel. The deformed structure created during the cold work process, numerous slip planes and the twins boundaries are just like the grain boundaries and the places where the chromium carbides preferentially precipitates. Due to the more evenly occurring precipitation processes within the whole deformed grains, there is no phenomenon of local grain boundary carbide precipitation, and thus there is no decrease in the resistance of this steel to intergranular corrosion. The assessment of the degree of intergranular corrosion was based on the measurement of mass loss and observation of corroded surfaces on optical and electron transmission and scanning microscopes.

scholarly journals Effects of TiC and Cr23C6 Carbides on Creep-Fatigue Properties in AISI 321 Stainless Steel

2002 ◽  
Vol 43 (11) ◽  
pp. 2808-2812 ◽  
Author(s):  
Kyung Seon Min ◽  
Soo Chan Lee ◽  
Soo Woo Nam
Keyword(s):  
Stainless Steel ◽  
Fatigue Properties ◽  
Creep Fatigue ◽  
Aisi 321
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