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首页> 外文期刊>Materials & design >Study of the processing map and hot deformation behavior of a Cu-bearing 317LN austenitic stainless steel
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Study of the processing map and hot deformation behavior of a Cu-bearing 317LN austenitic stainless steel

机译：含铜317LN奥氏体不锈钢的加工图和热变形行为的研究

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摘要

The hot-working behavior of a Cu-bearing 317LN austenitic stainless steel (317LN-Cu) was investigated in the 950-1150 ℃ temperature and 0.01-10 s~(-1) strain rate range, respectively. The effects of different deformation parameters and optimum hot-working window were respectively characterized through analyzing flow stress curves, constitutive equations, processing maps and microstructures. The critical strain for dynamic recrystalliza-tion (DRX) was determined by the inflection point on θ-σ and -∂θ/∂σ-σ curves. The peak stress was found to increase with decrease in temperature and increase in strain rate. Typical signs of DRX over a wide range of temperatures and strain rates were observed on the flow stress curves. The power dissipation maps in the strain range of 0.1-0.4 were basically similar, indicating the insignificant effect of strain on the power dissipation maps of 317LN-Cu. However, the instability maps showed strong strain sensitivity with increasing strain, which was attributed to the flow localization. The optimum hot-working window for 317LN-Cu was obtained in the temperature range 1100-1120 ℃ and strain rate range 0.01-0.018 s~(-1) with a peak efficiency of 38%. Microstructural analysis revealed fine and homogenized recrystallized grains in this domain.
机译：研究了含铜317LN奥氏体不锈钢（317LN-Cu）在950-1150℃温度和0.01-10 s〜（-1）应变速率范围内的热加工行为。通过分析流动应力曲线，本构方程，加工图和微观结构，分别表征了不同变形参数和最佳热加工窗口的影响。动态再结晶（DRX）的临界应变由θ-σ和-∂θ/∂σ-σ曲线上的拐点确定。发现峰值应力随着温度的降低和应变速率的增加而增加。在流动应力曲线上观察到在宽范围的温度和应变速率下DRX的典型迹象。应变范围为0.1-0.4时的功率耗散图基本相似，表明应变对317LN-Cu功率耗散图的影响不显着。然而，不稳定性图显示出随着应变的增加而具有很强的应变敏感性，这归因于流动局部化。在1100-1120℃的温度范围和0.01-0.018 s〜（-1）的应变速率范围内获得了317LN-Cu的最佳热加工窗口，峰值效率为38％。显微组织分析显示在该区域中细小且均质的重结晶晶粒。

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