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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Initial Microstructures on Deformation Behavior of 316LN Austenitic Steels at 400-900 degrees C
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Influence of Initial Microstructures on Deformation Behavior of 316LN Austenitic Steels at 400-900 degrees C

机译：初始显微组织对316LN奥氏体钢在400-900摄氏度下变形行为的影响

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摘要

Two batches of 316LN steels were processed differently to achieve specific initial microstructures. The influence of the initial microstructures on the deformation behavior of 316LN steels was investigated by tensile testing at 400-900 A degrees C. Both ultimate tensile strength and yield strength of 316LN steels were found to decrease with increasing testing temperature, and the deformation mechanism varied with testing temperature. At 600 A degrees C and below, dynamic recovery and deformation hardening balance each other. At 600-700 A degrees C, dynamic strain aging caused the serrated flow in the hardening rate-strain curves. At 800 A degrees C and above, polygonization and dynamic recrystallization were the main softening mechanism. High density of dislocations in the steel can enhance the yield strength. Dynamic recovery reduced the dislocation density and eliminated its effect on the ultimate tensile strength.
机译：对两批316LN钢进行了不同的处理，以实现特定的初始微观结构。通过在400-900 A的温度下进行拉伸试验研究了初始组织对316LN钢变形行为的影响。发现316LN钢的极限拉伸强度和屈服强度均随测试温度的升高而降低，并且变形机理有所不同与测试温度。在600 A或更低的温度下，动态恢复和变形硬化相互平衡。在600-700 A的温度下，动态应变时效在硬化速率-应变曲线中引起锯齿状流动。在800 A或更高的温度下，多边形化和动态再结晶是主要的软化机理。钢中位错的高密度可以提高屈服强度。动态恢复降低了位错密度并消除了其对极限抗拉强度的影响。

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