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The flow curves were measured for the stable austenitic steels 304L and 304LN by means of tensile test at room temperature,which are described by the models σ=K1εn1 + exp(K2 + n2ε), σ=Kεn1+n2lnε and σ=σ0+Kεn (where, K1, K2, n1 andn2; K, n1 and n2; σ0, K and n are constant). The comparison of the maximum deviations and the consideration of thevariation of the work hardening rate with true strain show that the flow curves for the austenitic steels 304L and 304LN canbe described by the model σ=Kεn1+n2 lnε at higher precision.The derivatives of the models σ=K1εn1 + exp(K2 + n2ε) and σ=Kεn1+n2lnε with respect to true strain, exhibit theextreme at low true strain. This inherent character indicates that both models are unsuitable to describe the part of the workhardening rate curve at low true strain.
The flow curves were measured for the stable austenitic steels 304L and 304LN by means of tensile test at room temperature, which are described by the models σ = K1εn1 + exp (K2 + n2ε), σ = Kεn1 + n2lnε and σ = σ0 + Kεn (where, K1, K2, n1 andn2; K, n1 and n2; σ0, K and n are constant). The comparison of the variance of the work hardening rate with true strain show that the flow curves for the austenitic steels 304L and 304LN canbe described by the model σ = Kεn1 + n2 lnε at higher precision. The derivatives of the models σ = K1εn1 + exp (K2 + n2ε) and σ = Kεn1 + n2lnε with respect to true strain, exhibit theextreme at low true strain. This inherent character indicates that both models are unsuitable to describe the part of the workhardening rate curve at low true strain.