| The response of a martensitic stainless steel, AISI 403, to stress corrosion cracking (SCC) under Mode Ⅰ and Mode Ⅲ loading has been investigated. SCC tests were conducted in 3.5 % NaCl solution using precracked specimens, tempered at 390℃, 520℃ and 610℃. Average crack propagation rates at various stress intensity levels were measured and compared for each mode. Experimental evidence indicates that Mode Ⅰloading exhibits higher crack propagation rate or stronger susceptibility to SCC than Mode Ⅲ loading under all the tempering conditions, which suggests that hydrogen embrittlement is involved in SCC. Furthermore, fractographic study reveals that SCC under both of the loading mode occurs on the notch plane with a predominant mode of intergranular fracture in all of the aforementioned tempering conditions. |
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