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A Study of Crystallography of Surface Austenite Precipitates in a Duplex Stainless Steel

Author: MengYang
Tutor: ZhangWenZheng
School: Tsinghua University
Course: Materials Science and Engineering
Keywords: Crystallographic phase transition Duplex stainless steel Surface floating sudden Interface O -line model
CLC: TG142.71
Type: PhD thesis
Year: 2010
Downloads: 146
Quote: 0
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Abstract


Crystallographic phase transition is a quantitative description of the phase transition after organization of knowledge. Duplex stainless steel phase change system is a diffusion type having a surface floating projection phenomenon phase change, and its complex morphology and phase change of the crystallographic characteristics of the quantitative analysis, to help people to deepen the understanding crystallographic phase change laws of the precipitated phase provide the tools for the analysis and control tissue microstructure in the change process. The thesis work in-depth study phase transformation crystallography 00Cr25Ni7Mo3 duplex stainless steel alloy systems austenite in the ferrite matrix surface precipitation, comprehensive application of scanning electron microscopy, electron backscatter diffraction, atomic probe surface austenitic precipitation phase of the three-dimensional morphology and the surface floating sudden phenomenon, was found needle-like morphology is the basic unit of surface precipitates, the complex morphology branching showed a needle-like. Application of the surface representative acicular precipitate phase and matrix bit transmission electron microscopy were used to characterize the relationship between the long axis, interface orientation. Quantitative analysis results show that the rich and varied surface precipitation phase morphology and crystallographic characteristics of the sample surface orientation is closely related. The work surface factors into the O-line model, the proposed surface constraint criterion. Crystallographic phase decomposition method using the expansion O line model combined with displacement of the three kinds of needle-like precipitation made reasonable quantitative interpretation, in particular, to explain the surface specific phenomena such as two phases Burgers vector deviate from interfacial dislocations with long axis direction of the deviation from the well with a \The extended O lines have universality, can be used for the other constraints of the phase-change system. The analysis showed that the surface between the precipitation phase and matrix may be configured V-twin habit plane, which is the surface layer of the unique three-dimensional morphology. Bis inertia conventional surface in different ways to achieve, for example, twins on the film strip of the base body / precipitate phase 1 / precipitate phase 2 / base body of the structure, as well as with a buffer layer sheet strips of the base body 1 / precipitate phase / base member 2 sandwich structure. This work also proposed matrix tilting involved in the organizational evolution model to explain the reasons of \Austenite precipitates will be formed on the surface of single pour or double tilting the surface floating sudden. The application of this work back scattered electron diffraction and atom probe technology positioning observing a the surface floating sudden the structure. Suddenly found that two-dumping floating by a strip of film was the relationship between the twins and a single the Introvert floating sudden single-chip bar.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metallic materials > Steel > Special performance of steels > Stainless steel, acid-resistant steel
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