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Precipitation and mechanical properties of UNS 2205 duplex steel subjected to hydrostatic extrusion after heat treatment

机译：热处理后经受静水挤压的UNS 2205双相钢的析出和力学性能

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摘要

The aim of this study was to analyze the impact of severe plastic deformation on 1.4462 duplex stainless steel (UNS 2205) subjected to hydrostatic extrusion (HE) and subsequent heat treatment at selected temperatures. The tests were conducted on a material deformed with a total strain of ε = 3.8 after annealing in the temperature range of 400–800 °C. The characterization was carried out using transmission electron microscopy (TEM), optical microscopy, Vickers hardness and tensile testing. The results showed that the strength of the steel was a function of strain aging, grain growth and phase transformation. The highest Ultimate Tensile Strength measured in the experiment was nearly 2.1 GPa compared with 1.7 GPa for the cold-deformed material. The changes in the austenite and ferrite phases after annealing were different, resulting in a peculiar microstructure with a mix of very small and fragmented γ and σ phases and recrystallized α grains. This resulted in an increase in its strength and a bimodal structure. Overall the research has described in detail the interactions that are present in high alloy steel during the heat treatment process.
机译：本研究的目的是分析严重的塑性变形对1.4462双相不锈钢（UNS 2205）进行静液压挤压（HE）和随后在选定温度下进行热处理的影响。在400–800–C的温度范围内退火后，对变形后的总应变为ε= 3.8的材料进行了测试。使用透射电子显微镜（TEM），光学显微镜，维氏硬度和拉伸试验进行表征。结果表明，钢的强度是应变时效，晶粒长大和相变的函数。在实验中测得的最高极限拉伸强度接近2.1 GPa，而冷变形材料为1.7 GPa。退火后奥氏体和铁素体相的变化是不同的，从而形成了一种特殊的微观结构，其中混有非常小的且分散的γ和σ相以及重结晶的α晶粒。这导致其强度和双峰结构的增加。总体而言，研究已详细描述了热处理过程中高合金钢中存在的相互作用。

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