Fatigue and SCC Behavior of Sensitized SUS304 Stainless Steel in Pressurized Hot Water at 7.3MPa and 288°C

2011 ◽  
Vol 399-401 ◽  
pp. 2276-2282 ◽  
Author(s):  
Anchalee Saengsai ◽  
Yuichi Otsuka ◽  
Yoshiharu Mutoh
Keyword(s):  
Stainless Steel ◽  
Threshold Stress ◽  
Constant Load ◽  
Fatigue Tests ◽  
Hot Water ◽  
Mean Stress ◽  
Threshold Stress Intensity ◽  
Sus304 Stainless Steel ◽  
R Ratio ◽  
Threshold Stress Intensity Factor

Plain fatigue and fretting fatigue tests of sensitized SUS304 stainless steel under pressurized hot water at 7.3MPa and 288°C have been carried out. Fatigue strengths for both fatigue tests almost coincided. Fretting contact could nucleate small SCC cracks near the contact edge in the direction perpendicular to cyclic loading. High R–ratio reduced fatigue strength due to longer exposure time to corrosive environment at high mean stress. From the constant load SCC tests of the specimen with small SCC pre–crack induced by fretting contact, it was found that the threshold stress intensity factor for growth of small SCC precrack was 4.1MPa·m1/2, which was significantly lower than that for long crack (10MPa·m1/2).

Prevention of Stress Corrosion Cracking of SUS304 by Tensile Overload

2010 ◽  
Author(s):  
Hayato Sano ◽  
Koji Takahashi ◽  
Kotoji Ando
Keyword(s):  
Stress Intensity Factor ◽  
Stainless Steel ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
Threshold Stress ◽  
Threshold Stress Intensity ◽  
Threshold Stress Intensity Factor ◽  
Tensile Overload

The effects of overload on the threshold stress intensity factor (KISCC) for stress corrosion cracks (SCC) in stainless steel were studied. Tensile overload was applied to a wedge opening loaded specimen of SUS304, and SCC tests were carried out to determine the resultant KISCC. The value of KISCC was found to increase with increasing stress intensity caused by tensile overload. Comparison of the effects of tensile overload on KISCC of SUS304 and SUS316 revealed that the effect on KISCC of SUS304 was smaller than that of SUS316.

Effect of Overload on the Threshold Stress Intensity Factor Range of SUS316 as a Function of Crack Size

2010 ◽  
Author(s):  
Kotoji Ando ◽  
Koji Takahashi ◽  
Yasuaki Hashikura ◽  
Keiji Houjyou
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Threshold Stress ◽  
Crack Size ◽  
Fatigue Tests ◽  
Stress Intensity Factor Range ◽  
Threshold Stress Intensity ◽  
Dugdale Model ◽  
Threshold Stress Intensity Factor

The effects of overload on the threshold stress intensity factor range (ΔKth) in SUS316 were studied. Tensile overload was applied to a CT(Compact tensiton) specimen of SUS316. Then, fatigue tests were carried out to determine the resultant threshold stress intensity factor range (ΔKth). The mechanism of the improvement of ΔKth by the tensile overloading was analyzed using the Dugdale model. It was clarified that the value of ΔKth increases as increasing the overloading. The compressive residual stress intensity factor (Kr) is the key factor controlling the value of ΔKth.

Improvement of the Threshold Stress Intensity Factor for Stress Corrosion Cracking in SUS316 by Tensile Overload

2010 ◽  
Author(s):  
Koji Takahashi ◽  
Yuji Miyazaki ◽  
Yasuaki Hashikura ◽  
Kotoji Ando
Keyword(s):  
Stress Intensity Factor ◽  
Stainless Steel ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Stress Corrosion ◽  
Threshold Stress ◽  
Stress Intensity Factor Range ◽  
Threshold Stress Intensity ◽  
Threshold Stress Intensity Factor ◽  
Tensile Overload

The effects of overload on the threshold stress intensity factor (KISCC) for stress corrosion cracks (SCC) in stainless steel were studied. Tensile overload was applied to a wedge opening loaded specimen of SUS316, and SCC tests were carried out to determine the resultant KISCC. As a result, the value of KISCC was found to increase with increasing stress intensity factor by tensile overload. The effects of tensile overload on KISCC and the threshold stress intensity factor range for fatigue (ΔKth) were compared. It was found that the effect of tensile overload on KISCC was larger than that of ΔKth.

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