大型部品を対象とした低合金鋼の質量効果の研究(熱処理)

概要

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A simple method is proposed to predict mechanical properties of heattreated large steel forgings. The method is based on the findings. Firstly, the main considerations for the strength and the ductility are the carbon content of the forging and the microstructures induced during quenching. Secondarily, the microstructures can be computed from available CCT diagrams and cooling rates of quenching in the temperature range of 600℃ to 300℃. These findings are verified experimentally on carbon steels and low-alloyed steels containing such elements as Ni, Cr and/or Mo. Equations for the rapid estimates of the cooling rates of steel forgings of the maximum diameter of 1000mm are derived experimentally as follows : logD+0.513 logC=2.37 when quenched in water logD+0.699 logC=2.02 oil logD+0.954 logC=1.18 air where, D is the diameter of a steel forging in mm. and C the looling rate in the temperature range of 600℃ to 300℃ in ℃/sec. Discussions are given on the validities of the findings and the equations.
社団法人日本鉄鋼協会の論文
1968-03-01