A STUDY OF THE SIZE EFFECT IN THE PLATING EMBRITTLEMENT OF HIGH STRENGTH STEELS.
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (ENGLAND)
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The report describes sustained load tests made on cadmium plated notched K sub t 3.2 specimens 14 in and 1 in diameter. Two steels were studied, En 24 and NCMV heat treated to 120 tonsq in TS. The results showed that En 24 was very susceptible to plating embrittlement, the maximum stress for unlimited life being in the region of 43 tonsq in 30 NTS. NCMV steel was found to be less sensitive having a corresponding value of 62-70 tonsq in 40 to 45 NTS. Comparative tests on NCMV steel showed no significant difference between the lives of large and small specimens. In determining the life under sustained load, a minimum testing time of 500 hr was found to be necessary. Author
- Metallurgy and Metallography