INTERGRANULAR CORROSION BEHAVIOUR OF IMPLANT STAINLESS STEEL DURING CORROSION FATIGUE
植入不锈钢腐蚀疲劳过程中的晶间腐蚀

The behaviours of intergranular corrosion on the rolled 316L and cast 317L implant stainless steels were studied by using SEM in the process of corrosion fatigue in Hank physiological solution. It was concluded that the initial fatigue cracks engender at the corroded granular boundaries and propagate along intergranule first and then transgranule under the fatigue stress. The intergranular corrosion is not due to the chrome-deficiency induced by the precipitation of carbide at the granular boundary but due to non-sensitized intergranular corrosion.