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首页> 外文期刊>Journal of Materials Engineering and Performance >Flow Softening Index for Assessment of Dynamic Recrystallization in an Austenitic Stainless Steel
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Flow Softening Index for Assessment of Dynamic Recrystallization in an Austenitic Stainless Steel

机译：奥氏体不锈钢中动态重结晶评估的流动软化指标

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摘要

The present study proposes a novel technique to assess dynamic recrystallization (DRX) and related microstructural phenomena during hot deformation of austenite. A 'Flow Softening Index (FSI)' has been identified on the basis of investigations on elevated temperature deformation behaviour of austenitic stainless steel. This index corresponds to dominant microstructural phenomena at different deformation conditions. For this investigation, experimental results obtained from isothermal, constant true strain rate compression tests in a temperature range of 1173 (900)-1473 K (1200 degrees C) and strain rate range of 0.01-100 s(-1) have been used. Resultant microstructures have been quantified using average grain size and grain size distributions. The dominant microstructural phenomena have been identified at different conditions using electron backscatter diffraction. Low FSI values are associated with the grain growth, intermediate values with DRX, and high values with the work-hardening and flow localisation phenomena. FSI also quantitatively indexes the average grain size and grain size distributions at different temperature-strain rate combinations. Analysis of the specific deformation conditions, particularly where 3.4< FSI< 3.5, indicates a common thermo-mechanical origin of flow localisation and DRX. The potential technological implications thereof are discussed and a semi-empirical model of microstructural evolution is developed for the studied material.
机译：本研究提出了一种新颖的技术来评估奥氏体热变形期间的动态再结晶（DRX）和相关的微观结构现象。已经基于奥氏体不锈钢升高的温度变形行为的研究来鉴定了“流量软化指数（FSI）”。该指数对应于不同变形条件下的主要微观结构现象。对于该研究，已经使用了在1173（900）-1473k（1200℃）和0.01-100S（-1）的温度范围内的等温，恒定的应变率压缩试验中获得的实验结果。使用平均晶粒尺寸和晶粒尺寸分布已经定量了所得的微观结构。使用电子反向散射衍射在不同条件下鉴定了显性微观结构现象。低FSI值与晶粒生长，具有DRX的中间值，以及具有工作硬化和流量定位现象的高值。 FSI还定量指定不同温度 - 应变速率组合的平均晶粒尺寸和晶粒尺寸分布。特定变形条件的分析，特别是在3.4

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