Abstract
In succession to our 13th and 14th report, the present investigation has been carried out to ascertain the effect of nitrogen, copper and arsenic on the impact-resistance, the decrease of impact-resistance by cold-work and V.P.H. The experiment was done on specimens containing C 0.01∼0.20, Cu 0∼0.85, As 0∼1.6, N2 0.003∼0.030. From the present investigation, the following results was obtained. (a) The same effect of nitrogen which was reported in the 13th and the 14th reports was recognized also in steels containing copper or arsenic. (b) The impact-resistance is not much changed by addition of ocpper. (c) By addition of arsenic, the impact-resistance is reduced, but the begree of reduction is not so strong as compared with the specimens containing phosphorous, (d) The strain-aging due to nitrogen increased severally in the range of 0∼0.006% of nitrogen in 0.4 percent copper steel as well as of 0∼0.005 percent in 0.2 percent arsenic steel.
