低合金熱間鍛造用型鋼の研究

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In order to develope the low-alloy hot-work forging-die steels with a superior thermal-crack risistivity, the effec of alloy components : C, Si, Mn, Cr, Mo, and V, and the effect of additional alloying elements : Ni, Cu, Co, Ti, W, Zr and Nb, on the properties of the Si-Cr-Mo-V steel have been investigated. Critical transformation temperatures, length change due to transformation, a thermal expansion coefficient, hardenability, elevated temperature mechanical properties as well as room-temperature tensile and impact properties of variously heat-treated structures (quenched and tempered, normalized and tempered) were determined. Si, which was considered to be most important alloying element, was very effective for the elevation in transformation temperatures and reduction in length change due to transformation. On the other hand, the variation in hardenability and transformation characteristics with increasing Si content was relatively small. The effect of increasing Si content on the mechanical properties of tempered martensitic structure was small, up to 2%Si. As for normalized and tempered structures, the variation of tensile properties with Si was small, but the impact value at the lower hardness level was decreased as Si content was increased. By the thermal-crack resistivity measurements, it was shown that these Si-Cr-Mo-V steels have very excellent resistivity in comparison with the conventional forging-die steel. Characteristics of Si-Cr-Mo-V steels in the present investigation (basic composition : 0.35%C-1.5% Si-1%Cr-0.4%Mo-0.2%V) are considered as follows : high resistivity for softening during tempering, high yield and tensile strength at elevated temperature, relatively good ductility and toughness, and superior thermal-crack resistivity.
社団法人日本鉄鋼協会の論文
1968-04-01

低合金熱間鍛造用型鋼の研究

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