SEDL / STP / STP645-EB / STP38090S

Effect of the Cyclic Rate on Corrosion Fatigue and Fractography of Type 304 Stainless Steel in Boiling 42 Percent Magnesium-Chloride Solution

Hioki, S
Doctor of Engineering, Mechanical Engineering Research Laboratory, Hitachi, Ltd., Ibaraki,

Muhai, Y
Doctor and professor, Faculty of Engineering, Osaka University, Osaka,

Pages: 20    Published: Jan 1978

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Abstract

Corrosion fatigue tests of Type 304 stainless steel were conducted at various cyclic rates between 0 and 104 rpm in boiling 42 percent magnesium-chloride (MgCI²) solution in rotating bending. As a result, the following conclusions were ob-tained: (a) the cyclic rate affects the failure life at the cyclic rates less than 10³ rpm, (b) the rate of crack propagation, da/dn, is proportional to the maximum stress intensity factor, Kmax, that is, da/dn = C ∙ Kmaxm, where C and m depend on the cyclic rate, (c) the fracture surfaces at higher cyclic rates and static loading were mostly of the transgranular type, that is, step pattern and striation, but the intergranular type was observed partly on the fracture surfaces at lower cyclic rates. Intergranular type fracture surface was observed most frequently at 1 rpm.