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首页> 外文期刊>Materials Science and Engineering >Microstructure evolution and adiabatic heating during dynamic biaxial deformation of a 304 stainless steel
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Microstructure evolution and adiabatic heating during dynamic biaxial deformation of a 304 stainless steel

机译：304不锈钢动态双轴变形过程中的微观结构演化与绝热加热

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摘要

This study focuses on the microstructure evolution and adiabatic heating during high strain rate biaxial deformation of a 304 stainless steel. Adiabatic heating is measured in situ during drop weight impact testing of the studied material. The considerable temperature rise induced by adiabatic heating (up to 184.3°C when impacted with 140 J) is detected. The microstructure was analyzed by X-ray diffraction (XRD), electron backscatter diffraction (EBSD) and high resolution transmission electron microscopy (HRTEM) techniques. Dislocation glide, twinning and austenite-martensite phase transformation are operating during high strain rate plastic deformation. The XRD analysis shows a steady increase of α'-martensite fraction (up to 36%) with plastic strain (up to 0.8), whereas the fraction of intermediate ε-martensite remains negligible (＜0.5%). The biaxial stress compensated the possible impediment of martensitic transformation caused by adiabatic heating and the increasing stacking fault energy (SFE). Nanotwins having a width of ～5 nm-～20 nm are inhomogeneously distributed in the microstructure. Interrelationship between adiabatic heating, deformation mechanisms and microstructure evolution is discussed.
机译：该研究侧重于304不锈钢高应变率双轴变形期间的微观结构演化和绝热加热。在研究期间在研究期间在原位测量绝热加热。检测到通过绝热加热引起的相当大的温度升高（撞击140 j时，高达184.3℃）。通过X射线衍射（XRD），电子反向散射衍射（EBSD）和高分辨率透射电子显微镜（HRTEM）技术分析了微观结构。位错滑动，孪晶和奥氏体 - 马氏体相变在高应变率塑性变形期间运行。 XRD分析显示α'-马氏体分数（高达36％）的稳定增加（高达0.8），而中间ε-马氏体的差分仍然可以忽略不计（<0.5％）。双轴应力补偿了绝热加热引起的马氏体变换的可能障碍和增加的堆叠故障能量（SFE）。宽度为〜5nm-〜20nm的纳米管在微观结构中不均匀地分布。讨论了绝热加热，变形机制和微观结构演化之间的相互关系。

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