Loading direction dependence of temper embrittlement observed in 21/4Cr-1Mo steel under sustained loading.
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概要
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A study to determine the effect of applied stress on the temper embrittlement, particularly the loading direction dependence of the embrittlement, was conducted for a 21/4Cr-1Mo steel. Isothermal ageings at 450°C for times up to 3000h were done for this purpose with and without the applied stress (210MPa). Charpy impact tests were mainly adopted to evaluate the degree of the embrittlement and SEM (scanning electron microscopy) and AES (Auger electron spectroscopy) were used for the fractographic examination of the fracture surfaces. The results showed that the embrittlement was enhanced especially for the specimen whose longitudinal direction is parallel to the loading direction.The cause for the embrittlement was attributed to the further weakening of grain boundaries, where phosphorus was segregated substantially to cause temper embrittlement, by the stress application.
- The Iron and Steel Institute of Japanの論文
The Iron and Steel Institute of Japan | 論文
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