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Microstructure characterisation of a low density steel by transmission electron microscopic study

机译：低密度钢的透射电子显微镜表征

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摘要

The microstructure including precipitates in a low density steel containing 3.3Mn-6.6Al-0.18C (wt%) was investigated using transmission electron microscopy under two heat treatment conditions of annealing (850 ℃, 1 min.) and annealing+ageing (400 ℃, 10min.). The phases identified by electron diffraction patterns were ferrite (α), austenite (γ), κ-carbides and M_3C type compounds. Ferrite was the matrix of the microstructures. The K-carbides were found to contain on average 9.9 wt% Mn and have the following orientation relationship with ferrite: (2 2 0)α || (2 0 0)κ with [1 1 2]α || [0 1 1]κ and (1 1 0)α || (1 1 1)κ with[1 1 2]α || [0 1 1]κ. Coarsening of K-carbides was observed in the annealed+aged condition as compared to the annealed condition. The solubility of Al and Mn in bcc ferrite and fcc austenite were determined. The κ-carbides consisted of a wide compositional range of Mn and Al.
机译：在退火（850℃，1分钟）和退火+时效（400℃）这两种热处理条件下，使用透射电子显微镜研究了含3.3Mn-6.6Al-0.18C（wt％）的低密度钢中包括析出物的组织。 ，10分钟。）。通过电子衍射图谱鉴定的相为铁素体（α），奥氏体（γ），κ-碳化物和M_3C型化合物。铁素体是微观结构的基质。发现该K-碳化物平均含有9.9 wt％的Mn，并且与铁素体具有以下取向关系：（2 2 0）α|| （2 0 0）κ与[1 1 2]α|| [0 1 1]κ和（1 1 0）α|| （1 1 1）κ与[1 1 2]α|| [0 1 1]κ。与退火条件相比，在退火+时效条件下观察到了K-碳化物的粗化。测定了Al和Mn在bcc铁素体和fcc奥氏体中的溶解度。 κ碳化物由广泛的Mn和Al组成。

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  • 来源
    《Materials Science and Engineering》 |2014年第3期|187-193|共7页
  • 作者

    W.T. Chao; R. Rana; C. Liu;

  • 作者单位

    Materials Characterisation and Pilot Manufacturing Department, Tata Steel, Swinden Technology Centre, Moorgate, Rotherham, South Yorkshire S60 3AR, United Kingdom;

    Materials Design Department, Tata Steel, IJmuiden Technology Centre, 3G.37, P.O. Box 10000, 1970 CA IJmuiden, The Netherlands;

    Materials Design Department, Tata Steel, IJmuiden Technology Centre, 3G.37, P.O. Box 10000, 1970 CA IJmuiden, The Netherlands;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Electron microscopy; Low density steel; Precipitation; Orientation relationships;

    机译：电子显微镜;低密度钢;沉淀;方向关系;

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