对球墨铸铁热处理氧化皮的观察

An Observation on Oxide Film of Ductile Iron Formed during Heat Treatment

观察了球墨铸铁正火、退火后氧化皮的宏观组织和微观组织,据此,提出根据氧化皮的色泽和形态,可大致判别正火、退火温度。

An observation was made on the macro-and micro-structures of oxide films of ductile iron formed during normalizing or annealing treatment. Based on this observation the author suggested that the normalizing or annealing temperature can be approximately assessed according to the morphologies and colours of the oxide films.