Estimation method of an adiabatic shear band formed on low carbon steel when cold-forged

摘要

The present invention relates to cold forging with respect to thermal insulation when shear band formation evaluation method and thermal insulation shear band formation inhibiting method for a low carbon steel. Cold forging during thermal insulation shear band formation evaluation method for low carbon steel is, (a) with the tensile test method comprising in order the tensile behavior analysis for each of the low-carbon Steel plurality of specimens under the same forging conditions, with or without cracks at the time of cold forging occur , (b) solution heat for the steps and, (c) each specimen the yugyunyeol low carbon steel to dynamic torsion test for the low-carbon, the cracks of the steel occurs shear stress for each specimen for the shear strain curve and the failure mode investigation processing steps and, (d) thermal insulation from the yugyunyeol step of cooling while varying the cooling conditions for each specimen of low carbon steel and (e) the tensile test for each sample the yugyunyeol low carbon steel and the dynamic twisting test shear bands It characterized in that it proceeds to a step of analyzing the likelihood of formation. It is possible to not only reduce the percentage of pearlite that acts in the deformation resistance is faster cooling rate To improve the efficiency of the cold forging to suppress the diffusion of the entire top of the interstitial employed atom to cause the yield point phenomenon by preventing the yield point phenomenon .