A TEM study of the crystallography of lath-shaped austenite precipitates in a duplex stainless steel

A TEM study of the crystallography of lath-shaped austenite precipitates in a duplex stainless steel
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双相不锈钢中板条状奥氏体析出物晶体学的 TEM 研究

DOI:
10.1007/s10853-017-1324-y
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发表时间:
2017-07
影响因子:
4.5
通讯作者:
Zhang Wen-Zheng
Zhang Wen-Zheng
中科院分区:
材料科学3区
文献类型:
--
作者:
Du Juan;Mompiou Frederic;Zhang Wen-Zheng

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双相不锈钢 (DSS) 中奥氏体 (fcc) 析出物的形态主要是分布在铁素体 (bcc) 基体中的棒状析出物。少数奥氏体析出物还呈现出板条形状,这是面心立方到面心立方转变中的常见形态,而不是 DSS 中的面心立方到面心立方转变中的常见形态。虽然在之前的研究中已经解释了 DSS 中的棒状奥氏体析出物,但板条形状的析出物还没有得到很好的理解。本研究主要通过透射电子显微镜研究板条状奥氏体。观察到板条状奥氏体的习性面没有位错,但在主侧面观察到一系列位错,间距为 9.6 nm,Burgers 矢量为 [110]f/2|[010]b。这些晶体学特征的观察结果通过 O 线和良好匹配位点分析得到了一致的解释。比较和讨论了 DSS 中的不同形态以及 fcc 到 bcc 和 bcc 到 fcc 转换中的相似形态。
The morphology of austenite (fcc) precipitates in a duplex stainless steel (DSS) is dominated by rods distributed in a ferrite (bcc) matrix. Minority of austenite precipitates also exhibits a lath shape, a common morphology in fcc to bcc transformations rather than a bcc to fcc transformation in a DSS. While the rod-shaped austenite precipitates in a DSS have been interpreted in previous investigations, precipitates with a lath shape were not well understood. This study focused on the lath-shaped austenite by using transmission electron microscopy. The habit plane of lath-shaped austenite was observed to be free of dislocations, but one array of dislocations was observed in the major side facet with a spacing of 9.6 nm and Burgers vector of [110]f/2|[010]b. These observations of crystallographic features were interpreted consistently by an O-line and good matching site analysis. Different morphologies in a DSS and similar morphologies in fcc to bcc and bcc to fcc transformations are compared and discussed.
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