ニッケルクロムモリブデン鋼 (SNCM 439) のせん断強度のひずみ速度および温度依存性

概要

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The influence of strain rate and temperature on the flow stress of nichel chromium molybdenum steel (SNCM 439) was studied through experiments. In the experiments, thin walled tubular specimens of short gage length were loaded at strain rates of 70〜10^3sec^<-1> in sheat by using a forsionalsplit Hopkinson bar apparants, and loaded at strain rates of 10^<-4>〜10^<-1>sec^<-1> by usinga combined tension-torsion loading apparatus and an Instron testing machine. Ths experiments were performed in shear over the temperature range -185℃ to 120℃. It is shown that the strain rate sensitivity of the yield point and of the flow stress in the region of small strain at -185℃ and -60℃ is remarkable, and that, below about -50℃, the influence of temperature on the flow stress reveal itself remarkably. It is confirmed that the experimental results obtained on the strain rate dependency and the temperature effect on the flow stress can be described fairly well with the practical conctitutive equation for an elastic/viscoplastic body proposed by one of the authors. The values of the parameters contained in the consititutive equation are also presented.
1985-12-15