某大型宽温域高速风洞喷管段柔板成形及加工工艺研究

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关键词：风洞；喷管段；柔板；低温钢；成形工艺

中图分类号：V211.74：TG156.92 文献标志码：A doi：10.3969/j.issn.1006-0316.2025.07.004

文章编号：1006-0316（2025） 07-0025-08

Abstract ： This study focuses on the development requirements of SO3 martensitic low temperature stainless steel flexible plate of nozle section of a large wide temperature range high speed wind tunnel. Process test and research such as hot-bending forming，heat treatment，cryogenic treatment，machining，surface finish and residual detection have been carried out by using medium-sized scaled-down test specimens.The process routes and parameters meeting the product's external dimensions and performance indicators have been proposed and have beensuccessfully applied in the development of two flexible plate products.The research findings demonstrate that by employing the methodsof hot-bending forming，high-temperature annealing，and normal-temperature rectification， a forming accuracy of up to 1.5mm can be achieved. Adopting the 900°C/1 h （wc） +750∘C/1 h （wc） +750°C/1 h （wc） +500∘C/2 h （AC） heat treatment process， the work piece can obtain a yield strength exceding 1000MPa while meeting the requirements for toughness indicators. Annealing treatment cannot reduce the surface residual stress.However，the residual stressinside the flexible plate is less than thaton the surface and satisfies the index requirements.The optimized heat treatment tool and the air-cooling method have a significant effect on controlling the heat treatment deformation ofthe product. Using staged milling on the topand bottom faces alternately and a polishing machine can ensure the final external dimension accuracy and surface quality of the flexible plate product.

Key words ∵ wind tunnel ; nozzle section ; flexible plate ; low temperature stainless steel ; forming proce

喷管段是为高速风洞提供跨超声速气流的关键部段，它位于收缩段下游、试验段上游，作用是使气流加速，并获得均匀流场[1]。（剩余8484字）