冲击温度对Fe-25Mn-3Al-3Si钢冲击性能及其微观组织的影响

冲击温度对Fe-25Mn-3Al-3Si钢冲击性能及其微观组织的影响

陈 亚，谢 盼，伍翠兰^*，尹炎祺，田松栗

(湖南大学材料科学与工程学院高分辨电镜中心，湖南 长沙410082)

摘 要：在不同实验温度下对Fe-Mn-Al-Si钢进行了V型缺口的夏比冲击实验。利用金相显微镜、扫描电子显微镜（SEM）、电子背散射衍射仪（EBSD）和透射电子显微镜（TEM）对冲击试样的微观组织结构进行表征。结果表明：在-190℃~200℃的冲击温度范围内，该TRIP/TWIP钢均为韧性断裂，没有出现韧脆转变现象。冲击温度影响冲击变形机制，高温冲击变形以位错滑移为主，室温下以形变孪晶诱导塑性（TWIP效应）为主，低温下逐渐以相变诱导塑性（TRIP效应）为主。该TRIP/TWIP钢在低温冲击过程中发生的TWIP、TRIP效应赋予其优异的低温冲击韧性。

关键词：TWIP效应；TRIP效应；冲击韧性；形变孪晶；ε-马氏体

中图分类号：TG142.1；TG113；TG115.5   文献标识码：A  doi:10.3969/j.1000-6281.2015-04.005

Effect of the temperature on impact properties and microstructure of Fe-25Mn-3Al-3Si steels

CHEN Ya，XIE Pan，WU Cuilan^*，YIN Yanqi，TIAN Song-li

（Center for High-Resolution Electron Microscopy, College of Materials Science and Engineering, Hunan University, Changsha Hunan 410082, China）

Abstract：The Charpy V notch impact toughness of Fe-25Mn-3Al-3Si steel was investigated at various temperature. Opticalmicroscope, scanning electron microscope (SEM), electron backscatter diffraction technology (EBSD) and transmission electron microscope (TEM) were used to characterize the microstructure of impact specimens. The results show thatthe ductile fracture occurs during impacting from -190℃ to 200℃ in the TRIP/TWIP steel and the ductile-brittle transition does not happen. The impact temperature influencesthe deformation mechanism: the dislocation glide is the dominate deformation mechanism at high temperature; the deformation twin induced plasticity(TWIP) effect appears at room temperature; the transformation induced plasticity(TRIP) effect gradually becomes dominate at low temperature. The TRIP/TWIPsteel exhibits higher impact toughness due to the TWIP/TRIP effect at cryogenic temperature.

Keywords: TWIP effect; TRIP effect; impact toughness; deformation twin; ε-martensite

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