軟鋼板の n 値におよぼす材質的要因

概要

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Metallurgical factors affecting the work hardening exponents (n-values) of low carbon rimmed steels were studied. The following results have been obtained ; (1) In the tension test, the amount of work per unit volume which was done on the specimen to the maximum load showed 8.3±0.4 kg/mm^2 in the low carbon rimmed steel samples, while those of the sample containing 0.1 wt% of phosphorus showed about 9.2 kg/mm^2. (2) Theoretical equations concerning n-value, and σ_O and K(which were obtained in a relationship σ=σ_0+K. ε near the maximum load) were obtained considering (1), and agreed well with the experimental results. (3) Effects of grain diameter on n-value shown by the next equation, was obtained by using (1) and (2). n=10/(10+σ_i+1.3d^<-1/2>) where d(mm) is average grain diameter and σ_i (kg/mm^2) is intrinsic strength. (4) The true effect of the content of a chemical element on n-value, eliminating the effect of grain size, was determined by using (1) and (2). Mn : the effect is related to manganese content in solid solution. N : the effect is dependent on manganese content. C. : the effect is saturated above about 0.03 wt%. S : the effect is far smaller than those of carbon, nitrogen and manganese. O : the effect is negligible. (5) Singularity of n-values of the samples containing phosphorus above about 0.05 wt% was found and explained well by using (1).
1972-07-01