Effect of temperature and time on microstructure, hardness and impact energy of CF8M
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Abstract
The primary coolant system of a nuclear power plant is made of stainless steel casting and the operating temperature is in the range of 290~330°C. If the coolant system is exposed to this temperature range for a long period, degradation of the material may occur. The present investigation is concerned with the degradation characteristics of CF8M(cast duplex stainless steel), exposed to temperatures of 326°C, 430°C and 700°C, respectively. After the CF8M specimens are maintained at the given temperature for particular thermally degraded specimens, all the specimens are water quenched. Each degraded specimen of the thermally degraded materials is classified into four or five types, depending on the holding time at the given temperatures. In order to investigate the characteristics of degradation, microstructure, micro vickers hardness, tensile and impact tests are performed for each type of specimen.
Keywords
CF8M embrittlement virgin material degraded material optical micrograph micro vickers hardness test tensile test impact testPreview
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