各種強靱鋼の熱處理に關する研究 (I)

概要

論文の詳細を見る
In order to obtain higher strength, toughness and lower notch-susceptibility without losing sufficient wear resistance, the authors intended to determine the most preferable conditions of tempering for oil hardened alloy steel pinions and gear wheels. Testing bars of several heats of Mn-Cr, Mn-Cr-Mo, Si-Mn-Cr, low Ni-Cr and high Xi-Cr steels, melted in electric arc furnaces were oil quenched and tempered at various temperatures, and the effect of tempering temperature on mechanical properties and microstructures were studied. The results obtained are summarized as follows : 1. Every kinds of steel, tempered at 300-350℃, shows remarkable inferiority in shock value and repeating shock durability, but these properties will be somewhat improved when tempered at 200℃. In order to remove such a defect it is recommended to lower the phosphor content of the heat. 2. Every kinds of steel, tempered at approx, 450-500℃ has the highest durabillity in repeating shock test. In spite of its low Charpy values, Ni-Cr steel, temper at low temperature, has exceedingly better durability than other steels. 3. Effect of tempering temperature on notched tensile strength is apparently similar to repeating shock property, accordingly, it would be considered that the variation of notch-susceptibility on low temperature tempering will have a similar effect on both statical and dynamical stress applied.
社団法人日本鉄鋼協会の論文
1951-03-25