In-situ microstructural evolutions of 5Mn steel at elevated temperature in a transmission electron microscope

IF 3.1 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Journal of Iron and Steel Research(International) Pub Date : 2017-11-01 DOI:10.1016/S1006-706X(17)30161-9
Han-bo Jiang , Xi-nan Luo , Xiao-yan Zhong , Hui-hua Zhou , Cun-yu Wang , Jie Shi , Han Dong
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引用次数: 5

Abstract

The microstructural evolutions of 5Mn steel during various heat treatments have been investigated by in-situ transmission electron microscopy (TEM). The specimen of 5Mn steel was prepared using focused ion beam (FIB) milling, which allowed the selection of specific morphology of interest prior to the in-situ observation. The complete austenization at 800 °C was verified at the atomic scale by minimizing thermal expansion and sample drift in a heating holder based on micro-electro-mechanical-systems. During annealing at 650 °C, the formation of reverted austenite was dynamically observed, while the morphologies of austenite laths of 5Mn steel after in-situ heating were quite similar to that after ex-situ intercritical annealing. During annealing at 500 °C, the morphological evolution of cementite and associated Mn diffusion were investigated. It was demonstrated that a combination of FIB sampling and high temperature in-situ TEM enables us to probe the morphological evolution and elemental diffusion of specific areas of interest in steel at high spatial resolution.

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5Mn钢在高温下的原位组织演变
采用原位透射电镜(TEM)研究了5Mn钢在不同热处理过程中的组织演变。采用聚焦离子束(FIB)铣削法制备5Mn钢试样,在现场观察之前可以选择感兴趣的特定形貌。在基于微机电系统的加热支架中,通过最小化热膨胀和样品漂移,在原子尺度上验证了800°C时的完全奥氏体化。650℃退火过程中,动态观察到还原奥氏体的形成,而5Mn钢原位加热后的奥氏体板条形貌与非原位临界间退火后的奥氏体板条形貌十分相似。在500℃退火过程中,研究了渗碳体的形态演变和相关的Mn扩散。结果表明,FIB采样和高温原位透射电镜的结合使我们能够以高空间分辨率探测钢中特定区域的形态演变和元素扩散。
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来源期刊
CiteScore
4.30
自引率
0.00%
发文量
2879
审稿时长
3.0 months
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