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对节镍型高氮奥氏体不锈钢在不同应变速率、不同变形温度下进行热变形模拟试验,并根据试验数据绘制应力-应变曲线。利用加工硬化率θ与应力-应变σ的曲线拐点和-dθ/dσ-σ曲线最小值点判定动态再结晶开始状态。确定动态再结晶临界应力σ_c和临界应变ε_c。同时计算出临界应变ε_c与峰值ε_p间的关系:ε_c≈0.378ε_p。构建出节镍型奥氏体不锈钢动态再结晶临界应变预测模型:lnε_c=0.026 85lnZ-4.7358。
The high-nitrogen austenitic nickel-austenitic stainless steel is subjected to the thermal deformation simulation test under different strain rates and different deformation temperatures, and the stress-strain curve is drawn according to the experimental data. The onset of dynamic recrystallization was determined using the inflection point of the work-hardening ratio θ and the stress-strain σ curve and the minimum point of the -dθ / dσ-σ curve. Determine the dynamic recrystallization critical stress σ_c and critical strain ε_c. At the same time, the relationship between critical strain ε_c and peak value ε_p is calculated: ε_c≈0.378ε_p. The predictive model of dynamic recrystallization critical strain of Ni-austenitic stainless steel was established: lnεc = 0.02685lnZ-4.7358.