抄録
A piston rod made of nickel-chrome steel for the 4, 800H.P. Gas blowing engine, manufactured by the foreign works was fractured. Investigating the cause of failure, the Corrosion fatigue due to cooling water was found to be an important factor.
Therefore, series of fatigue tests on the fractured material and also on carbon steels with a tensile strength of about 60kg/mmmm2 were carried out with special care to the corrosion fatigue, the conclusions are as follow;-
1. The carbon steel is sufficiently good as a material for the piston rod.
2. The degree of forging increases the resistance to corrosion fatigue.
3. By using emulsion oil as a cooling medium, the corrosion fatigue can be prevented to a certain extent.
