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本文利用带能谱(EDS)的透射电镜(TEM)分析技术(STEM/EDS),研究了工业生产中常用的奥氏体不锈钢焊缝中δ+γ双相结构的组织形态,晶体学取向关系和显微成分偏析。样品Ⅰ:奥302(25-13型)+18-8Ti和样品Ⅱ:奥402(25-20型)+18-8Ti是在焊条自动焊机上堆焊面成的。由于焊接的特殊热作用,焊缝的形成过程是一种非平衡快速凝固结晶过程。焊缝中δ铁索体的含量和形态决定于Cr/Ni比值和焊接规范。对于Ⅰ号样品,其凝固时首先析出δ相,残留下来的骨架状δ铁素体与奥氏体之间可存在K-S取向关系(图1),也可不存在取向关系。δ→γ转变是一种介于切变型和扩散型转变之间的过渡性转变——块
In this paper, the transmission electron microscopy (TEM) analysis (EDEM) with energy dispersive spectroscopy (EDS) was used to study the microstructure and crystallographic orientation of the δ + γ duplex structure in the austenitic stainless steel weld commonly used in industrial production. And microscopic segregation. Sample I: Austrian 302 (type 25-13) + 18-8Ti and sample II: Austrian 402 (type 25-20) + 18-8Ti welded surface welding machine in the electrode. Due to the special heat effect of welding, the weld formation process is a non-equilibrium rapid solidification and crystallization process. The content and morphology of delta ferrite in the weld depends on the Cr / Ni ratio and the welding specification. For Sample I, the δ phase precipitates first when solidified, and the K-S orientation between the remaining skeleton-shaped δ ferrite and austenite (Fig. 1) may or may not exist. The δ → γ transition is a transitional transition between the shear-type and diffusion-type transitions