corrosion fatigue crack initiation behavior of stainless
The present article addresses the stress corrosion cracking (SCC) and subsequent corrosion fatigue cracking (CFC) behavior of a heat-treated duplex stainless steel (DSS)in paper- machine white waters containing chloride and thiosulfate ions.
Corrosion current transients synchronized with the cyclic strain were observed when AISI Type 316 stainless steel plate was strained by reverse bending at 24 Hz in selected aqueous media. This was accomplished by extracting for oscilloscope display the regular fluctuating component of the corrosion current flowing when the sample was polarized to prescribed potentials. Continuity of Environmentally Assisted Fatigue and Stress Oct 26, 2017 · It has been reported that F en for stainless steel saturates at a very low strain rate. However, the relationship between environmentally assisted fatigue (EAF) and stress corrosion cracking (SCC) is still unclear. The aim of this study is to investigate the short crack growth behavior and possible continuity of EAF and SCC at very low strain
Aug 01, 2019 · Corrosion fatigue behavior of type 316N stainless steel (SS) weldments on the damage characteristics is studied. The S-N curve of the fatigue life versus stress amplitude showed a specific two slope Basquin relationship. At low stress amplitude, the deformation microstructure consists mainly of planar slip dislocation structure and at high-stress amplitudes, planar multiple slip Corrosion Fatigue Crack Initiation of Type 316N Weldment Aug 06, 2019 · Corrosion fatigue cracks initiation time of type 316N SS weldments in acidic chloride solution was investigated using compliance based approach. The decrease in fatigue life was observed with an increase in stress amplitude for type 316N weldment. However, no fatigue limit was observed.
Corrosion fatigue behavior of type 316N stainless steel (SS) weldments on the damage characteristics is studied. The SN curve of the fatigue life versus stress amplitude showed a specific two slope Basquin relationship. At low stress amplitude, the deformation microstructure consists mainly of planar slip dislocation structure and at high-stress amplitudes, planar multiple slip dislocations Dependence of Corrosion Fatigue Crack Initiation Nonmetallic inclusions were found to play an important role in corrosion fatigue crack initiation. In the 12% chromium steel, sulfide inclusions acted as pit initiation sites. Chemically inert niobiumcarbonitrides in the 18% chromium steel induced local corrosion attack, but only under corrosion fatigue conditions in the 4N sodium chloride solution.
Aug 30, 2018 · Corrosion fatigue (CF) behavior of AISI 316L was investigated in a 3 pct NaCl aqueous solution at an R = 1 stress ratio and a frequency of 60 Hz at room temperature. The test scale specimen was 7 cm2. The passive (0 mVRef), pitting (120 mVRef), and cathodic ( 1400 mVRef) polarization potentials were statically applied and recorded during CF tests until the samples were Effect of cold deformation on corrosion fatigue behavior And improvement in fatigue limit of 20% and 35% pre-strained HNASS is in comparison with the 0% HNASS, while corrosion would undermine the fatigue behavior of HNASS. In a suitable range, the pre-straining had a beneficial effect on corrosion fatigue strength of HNASS, such as nearly 300 MPa improved with 20% cold deformation.
May 01, 2015 · On the one hand, the high temperature water environment can promote the fatigue crack initiation by pitting corrosion or dissolution at the surface of specimens , . On the other hand, the effect of high temperature water on the crack propagation of SSs can be attributed to the anodic dissolution or hydrogen embrittlement at the crack tip of the SSs  ,  ,  . Fatigue Crack Initiation and Early Growth Behavior of a Shimizu, Toshihiro This paper examines fatigue crack initiation and growth behavior in a ferritic stainless steel, SUS444. Fatigue tests were conducted in laboratory air and in 3%NaCl aqueous solution using an electro-hydraulic fatigue testing machine. Specimens with two different orientations, L
Apr 13, 2020 · The fatigue crack propagation is characterized by using Paris law which relates the crack growth rate, , to the range of energy release rate at the crack tip. The fatigue crack initiation is governed by the following equation:where is the number of cycles and and are the material constants, and their values are taken to be and Ultrasonic Corrosion Fatigue Behavior of High Strength Corrosion pit was observed on corrosion fatigue crack initiation area. Striation was predominantly observed on crack propagation area in air and in 3% NaCl aqueous solution. The reduction of corrosion fatigue strength of high strength austenitic stainless steels such as YUS270 and SUS304N2 is due to the corrosion pit formation at corrosion fatigue crack initiation area.
Nov 15, 2007 · The most of the corrosion fatigue life of 12% chromium stainless steel is spend by fatigue crack initiation. Electrochemical noise measurement method can be the available to observe corrosion fatigue crack initiation process. The following investigations are still required:(i) Evaluation of corrosion fatigue crack initiation mechanism. (ii)