ELECTRON MICROSTRUCTURE OF THE WORK ROLL FOR COLD ROLLING (II)
1957 Volume 43 Issue 4 Pages 451-456
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1957 Volume 43 Issue 4 Pages 451-456
In sequence of Report I ("Tetsu-to-Hagane" Vol. 43. No. 2, 1957, p. 127), the quenched structures of the small specimens of roll material were examined. By water quenching after holding 3 hours at 860°C, specimens which had been completely spheroidized showed properly distributed carbides in fine martensite matrix. On the contrary, specimens imperfectly spheroidized corresponded to coarse martensite and retained austenite.
Upon heating for succesive quenching, the effect of holding temperature and time was examined on another roll material, the best condition for the structure and hardness was found in the neighbourhood of 860°C.
