-1下的壓縮變形行為，分析了變形溫度和應(yīng)變速率對熱流曲線的影響?；谖诲e密度理論，建立了316LN鋼的熱變形本構(gòu)模型，并揭示了316LN鋼的軟化機(jī)理。結(jié)果表明，在高溫低應(yīng)變速率（小于0.1 s-1）條件下，動態(tài)再結(jié)晶（DRX）為主導(dǎo)軟化機(jī)理；在高溫高應(yīng)變速率（大于1 s-1）條件下，動態(tài)回復(fù)（DRV）為主導(dǎo)軟化機(jī)理；在高溫及應(yīng)變速率為0.1和1 s-1條件下，DRV和DRX共同作用。構(gòu)建的模型可以很好地預(yù)測316LN鋼的熱變形行為，其Pearson相關(guān)系數(shù)為0.9956，平均相對誤差絕對值為3.07%，為一個精確的本構(gòu)模型。;The compression deformation behavior of 316LN austenitic stainless steel was investigated at 1050~1200 °C under strain rate of 0.1, 1, 50 s-1. The influence of deformation temperature and strain rate on the hot flow curves was analyzed. Based on the dislocation density theory, the hot deformation constitutive model of 316LN steel was established. The softening mechanism of the 316LN steel was revealed. The results show that the dynamic recrystallization (DRX) dominates the softening mechanism under the condition of high temperature and low strain rate (<0.1 s-1); the dynamic recovery (DRV) dominates the softening mechanism under the condition of high temperature and high strain rate (>1 s-1); DRX and DRV dominate the softening mechanism under the condition of high temperature and strain rate of 0.1, 1 s-1. The established constitutive model can precisely predict the hot deformation behavior of 316LN steel: its Pearson correlation coefficient is 0.9956 and the average absolute value of relative error is 3.07%, indicating the accuracy of this constitutive model."/>